Mercurial > repos > yating-l > jbrowsearchivecreator

annotate test/lib/python2.7/warnings.py @ 3:7d1a9a91b989 draft

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planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
author yating-l
date Thu, 18 May 2017 18:37:28 -0400
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3
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1 """Python part of the warnings subsystem."""
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2
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3 # Note: function level imports should *not* be used
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4 # in this module as it may cause import lock deadlock.
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5 # See bug 683658.
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6 import linecache
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7 import sys
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8 import types
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9
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10 __all__ = ["warn", "warn_explicit", "showwarning",
7d1a9a91b989 planemo upload for repository https://github.com/Yating-L/jbrowse-archive-creator.git commit d583ac16a6c6942730ea536eb59cc37941816030-dirty
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11 "formatwarning", "filterwarnings", "simplefilter",
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12 "resetwarnings", "catch_warnings"]
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13
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14
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15 def warnpy3k(message, category=None, stacklevel=1):
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16 """Issue a deprecation warning for Python 3.x related changes.
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17
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18 Warnings are omitted unless Python is started with the -3 option.
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19 """
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20 if sys.py3kwarning:
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21 if category is None:
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22 category = DeprecationWarning
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23 warn(message, category, stacklevel+1)
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24
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25 def _show_warning(message, category, filename, lineno, file=None, line=None):
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26 """Hook to write a warning to a file; replace if you like."""
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27 if file is None:
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28 file = sys.stderr
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29 if file is None:
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30 # sys.stderr is None - warnings get lost
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31 return
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32 try:
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33 file.write(formatwarning(message, category, filename, lineno, line))
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34 except (IOError, UnicodeError):
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35 pass # the file (probably stderr) is invalid - this warning gets lost.
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36 # Keep a working version around in case the deprecation of the old API is
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37 # triggered.
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38 showwarning = _show_warning
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39
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40 def formatwarning(message, category, filename, lineno, line=None):
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41 """Function to format a warning the standard way."""
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42 try:
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43 unicodetype = unicode
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44 except NameError:
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45 unicodetype = ()
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46 try:
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47 message = str(message)
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48 except UnicodeEncodeError:
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49 pass
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50 s = "%s: %s: %s\n" % (lineno, category.__name__, message)
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51 line = linecache.getline(filename, lineno) if line is None else line
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52 if line:
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53 line = line.strip()
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54 if isinstance(s, unicodetype) and isinstance(line, str):
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55 line = unicode(line, 'latin1')
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56 s += " %s\n" % line
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57 if isinstance(s, unicodetype) and isinstance(filename, str):
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58 enc = sys.getfilesystemencoding()
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59 if enc:
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60 try:
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61 filename = unicode(filename, enc)
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62 except UnicodeDecodeError:
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63 pass
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64 s = "%s:%s" % (filename, s)
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65 return s
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66
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67 def filterwarnings(action, message="", category=Warning, module="", lineno=0,
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68 append=0):
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69 """Insert an entry into the list of warnings filters (at the front).
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70
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71 'action' -- one of "error", "ignore", "always", "default", "module",
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72 or "once"
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73 'message' -- a regex that the warning message must match
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74 'category' -- a class that the warning must be a subclass of
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75 'module' -- a regex that the module name must match
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76 'lineno' -- an integer line number, 0 matches all warnings
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77 'append' -- if true, append to the list of filters
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78 """
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79 import re
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80 assert action in ("error", "ignore", "always", "default", "module",
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81 "once"), "invalid action: %r" % (action,)
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82 assert isinstance(message, basestring), "message must be a string"
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83 assert isinstance(category, (type, types.ClassType)), \
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84 "category must be a class"
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85 assert issubclass(category, Warning), "category must be a Warning subclass"
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86 assert isinstance(module, basestring), "module must be a string"
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87 assert isinstance(lineno, int) and lineno >= 0, \
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88 "lineno must be an int >= 0"
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89 item = (action, re.compile(message, re.I), category,
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90 re.compile(module), lineno)
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91 if append:
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92 filters.append(item)
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93 else:
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94 filters.insert(0, item)
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95
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96 def simplefilter(action, category=Warning, lineno=0, append=0):
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97 """Insert a simple entry into the list of warnings filters (at the front).
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98
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99 A simple filter matches all modules and messages.
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100 'action' -- one of "error", "ignore", "always", "default", "module",
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101 or "once"
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102 'category' -- a class that the warning must be a subclass of
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103 'lineno' -- an integer line number, 0 matches all warnings
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104 'append' -- if true, append to the list of filters
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105 """
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106 assert action in ("error", "ignore", "always", "default", "module",
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107 "once"), "invalid action: %r" % (action,)
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108 assert isinstance(lineno, int) and lineno >= 0, \
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109 "lineno must be an int >= 0"
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110 item = (action, None, category, None, lineno)
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111 if append:
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112 filters.append(item)
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113 else:
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114 filters.insert(0, item)
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115
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116 def resetwarnings():
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117 """Clear the list of warning filters, so that no filters are active."""
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118 filters[:] = []
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119
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120 class _OptionError(Exception):
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121 """Exception used by option processing helpers."""
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122 pass
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123
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124 # Helper to process -W options passed via sys.warnoptions
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125 def _processoptions(args):
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126 for arg in args:
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127 try:
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128 _setoption(arg)
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129 except _OptionError, msg:
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130 print >>sys.stderr, "Invalid -W option ignored:", msg
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131
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132 # Helper for _processoptions()
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133 def _setoption(arg):
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134 import re
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135 parts = arg.split(':')
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136 if len(parts) > 5:
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137 raise _OptionError("too many fields (max 5): %r" % (arg,))
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138 while len(parts) < 5:
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139 parts.append('')
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140 action, message, category, module, lineno = [s.strip()
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141 for s in parts]
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142 action = _getaction(action)
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143 message = re.escape(message)
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144 category = _getcategory(category)
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145 module = re.escape(module)
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146 if module:
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147 module = module + '$'
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148 if lineno:
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149 try:
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150 lineno = int(lineno)
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151 if lineno < 0:
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152 raise ValueError
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153 except (ValueError, OverflowError):
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154 raise _OptionError("invalid lineno %r" % (lineno,))
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155 else:
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156 lineno = 0
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157 filterwarnings(action, message, category, module, lineno)
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158
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159 # Helper for _setoption()
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160 def _getaction(action):
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161 if not action:
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162 return "default"
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163 if action == "all": return "always" # Alias
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164 for a in ('default', 'always', 'ignore', 'module', 'once', 'error'):
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165 if a.startswith(action):
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166 return a
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167 raise _OptionError("invalid action: %r" % (action,))
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168
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169 # Helper for _setoption()
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170 def _getcategory(category):
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171 import re
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172 if not category:
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173 return Warning
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174 if re.match("^[a-zA-Z0-9_]+$", category):
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175 try:
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176 cat = eval(category)
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177 except NameError:
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178 raise _OptionError("unknown warning category: %r" % (category,))
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179 else:
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180 i = category.rfind(".")
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181 module = category[:i]
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182 klass = category[i+1:]
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183 try:
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184 m = __import__(module, None, None, [klass])
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185 except ImportError:
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186 raise _OptionError("invalid module name: %r" % (module,))
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187 try:
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188 cat = getattr(m, klass)
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189 except AttributeError:
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190 raise _OptionError("unknown warning category: %r" % (category,))
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191 if not issubclass(cat, Warning):
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192 raise _OptionError("invalid warning category: %r" % (category,))
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193 return cat
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194
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195
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196 # Code typically replaced by _warnings
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197 def warn(message, category=None, stacklevel=1):
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198 """Issue a warning, or maybe ignore it or raise an exception."""
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199 # Check if message is already a Warning object
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200 if isinstance(message, Warning):
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201 category = message.__class__
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202 # Check category argument
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203 if category is None:
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204 category = UserWarning
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205 assert issubclass(category, Warning)
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206 # Get context information
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207 try:
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208 caller = sys._getframe(stacklevel)
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209 except ValueError:
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210 globals = sys.__dict__
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211 lineno = 1
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212 else:
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213 globals = caller.f_globals
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214 lineno = caller.f_lineno
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215 if '__name__' in globals:
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216 module = globals['__name__']
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217 else:
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218 module = "<string>"
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219 filename = globals.get('__file__')
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220 if filename:
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221 fnl = filename.lower()
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222 if fnl.endswith((".pyc", ".pyo")):
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223 filename = filename[:-1]
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224 else:
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225 if module == "__main__":
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226 try:
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227 filename = sys.argv[0]
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228 except AttributeError:
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229 # embedded interpreters don't have sys.argv, see bug #839151
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230 filename = '__main__'
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231 if not filename:
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232 filename = module
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233 registry = globals.setdefault("__warningregistry__", {})
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234 warn_explicit(message, category, filename, lineno, module, registry,
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235 globals)
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236
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237 def warn_explicit(message, category, filename, lineno,
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238 module=None, registry=None, module_globals=None):
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239 lineno = int(lineno)
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240 if module is None:
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241 module = filename or "<unknown>"
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242 if module[-3:].lower() == ".py":
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243 module = module[:-3] # XXX What about leading pathname?
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244 if registry is None:
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245 registry = {}
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246 if isinstance(message, Warning):
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247 text = str(message)
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248 category = message.__class__
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249 else:
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250 text = message
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251 message = category(message)
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252 key = (text, category, lineno)
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253 # Quick test for common case
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254 if registry.get(key):
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255 return
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256 # Search the filters
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257 for item in filters:
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258 action, msg, cat, mod, ln = item
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259 if ((msg is None or msg.match(text)) and
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260 issubclass(category, cat) and
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261 (mod is None or mod.match(module)) and
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262 (ln == 0 or lineno == ln)):
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263 break
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264 else:
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265 action = defaultaction
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266 # Early exit actions
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267 if action == "ignore":
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268 registry[key] = 1
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269 return
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270
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271 # Prime the linecache for formatting, in case the
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272 # "file" is actually in a zipfile or something.
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273 linecache.getlines(filename, module_globals)
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274
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275 if action == "error":
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276 raise message
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277 # Other actions
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278 if action == "once":
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279 registry[key] = 1
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280 oncekey = (text, category)
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281 if onceregistry.get(oncekey):
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282 return
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283 onceregistry[oncekey] = 1
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284 elif action == "always":
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285 pass
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286 elif action == "module":
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287 registry[key] = 1
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288 altkey = (text, category, 0)
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289 if registry.get(altkey):
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290 return
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291 registry[altkey] = 1
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292 elif action == "default":
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293 registry[key] = 1
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294 else:
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295 # Unrecognized actions are errors
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296 raise RuntimeError(
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297 "Unrecognized action (%r) in warnings.filters:\n %s" %
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298 (action, item))
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299 # Print message and context
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300 showwarning(message, category, filename, lineno)
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301
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302
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303 class WarningMessage(object):
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304
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305 """Holds the result of a single showwarning() call."""
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306
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307 _WARNING_DETAILS = ("message", "category", "filename", "lineno", "file",
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308 "line")
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309
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310 def __init__(self, message, category, filename, lineno, file=None,
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311 line=None):
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312 local_values = locals()
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313 for attr in self._WARNING_DETAILS:
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314 setattr(self, attr, local_values[attr])
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315 self._category_name = category.__name__ if category else None
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316
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317 def __str__(self):
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318 return ("{message : %r, category : %r, filename : %r, lineno : %s, "
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319 "line : %r}" % (self.message, self._category_name,
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320 self.filename, self.lineno, self.line))
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321
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322
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323 class catch_warnings(object):
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324
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325 """A context manager that copies and restores the warnings filter upon
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326 exiting the context.
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327
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328 The 'record' argument specifies whether warnings should be captured by a
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329 custom implementation of warnings.showwarning() and be appended to a list
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330 returned by the context manager. Otherwise None is returned by the context
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331 manager. The objects appended to the list are arguments whose attributes
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332 mirror the arguments to showwarning().
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333
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334 The 'module' argument is to specify an alternative module to the module
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335 named 'warnings' and imported under that name. This argument is only useful
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336 when testing the warnings module itself.
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337
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338 """
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339
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340 def __init__(self, record=False, module=None):
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341 """Specify whether to record warnings and if an alternative module
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342 should be used other than sys.modules['warnings'].
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343
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344 For compatibility with Python 3.0, please consider all arguments to be
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345 keyword-only.
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346
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347 """
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348 self._record = record
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349 self._module = sys.modules['warnings'] if module is None else module
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350 self._entered = False
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351
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352 def __repr__(self):
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353 args = []
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354 if self._record:
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355 args.append("record=True")
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356 if self._module is not sys.modules['warnings']:
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357 args.append("module=%r" % self._module)
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358 name = type(self).__name__
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359 return "%s(%s)" % (name, ", ".join(args))
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360
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361 def __enter__(self):
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362 if self._entered:
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363 raise RuntimeError("Cannot enter %r twice" % self)
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364 self._entered = True
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365 self._filters = self._module.filters
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366 self._module.filters = self._filters[:]
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367 self._showwarning = self._module.showwarning
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368 if self._record:
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369 log = []
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370 def showwarning(*args, **kwargs):
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371 log.append(WarningMessage(*args, **kwargs))
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372 self._module.showwarning = showwarning
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373 return log
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374 else:
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375 return None
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376
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377 def __exit__(self, *exc_info):
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378 if not self._entered:
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379 raise RuntimeError("Cannot exit %r without entering first" % self)
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380 self._module.filters = self._filters
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381 self._module.showwarning = self._showwarning
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382
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383
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384 # filters contains a sequence of filter 5-tuples
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385 # The components of the 5-tuple are:
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386 # - an action: error, ignore, always, default, module, or once
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387 # - a compiled regex that must match the warning message
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388 # - a class representing the warning category
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389 # - a compiled regex that must match the module that is being warned
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390 # - a line number for the line being warning, or 0 to mean any line
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391 # If either if the compiled regexs are None, match anything.
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392 _warnings_defaults = False
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393 try:
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394 from _warnings import (filters, default_action, once_registry,
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395 warn, warn_explicit)
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396 defaultaction = default_action
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397 onceregistry = once_registry
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398 _warnings_defaults = True
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399 except ImportError:
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400 filters = []
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401 defaultaction = "default"
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402 onceregistry = {}
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403
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404
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405 # Module initialization
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406 _processoptions(sys.warnoptions)
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407 if not _warnings_defaults:
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408 silence = [ImportWarning, PendingDeprecationWarning]
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409 # Don't silence DeprecationWarning if -3 or -Q was used.
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410 if not sys.py3kwarning and not sys.flags.division_warning:
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411 silence.append(DeprecationWarning)
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412 for cls in silence:
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413 simplefilter("ignore", category=cls)
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414 bytes_warning = sys.flags.bytes_warning
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415 if bytes_warning > 1:
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416 bytes_action = "error"
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417 elif bytes_warning:
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418 bytes_action = "default"
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419 else:
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420 bytes_action = "ignore"
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421 simplefilter(bytes_action, category=BytesWarning, append=1)
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422 del _warnings_defaults