Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/pluggy/callers.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
parents
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0
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1 """
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2 Call loop machinery
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3 """
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4 import sys
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5 import warnings
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6
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7 _py3 = sys.version_info > (3, 0)
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8
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9
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10 if not _py3:
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11 exec(
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12 """
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13 def _reraise(cls, val, tb):
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14 raise cls, val, tb
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15 """
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16 )
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17
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18
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19 def _raise_wrapfail(wrap_controller, msg):
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20 co = wrap_controller.gi_code
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21 raise RuntimeError(
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22 "wrap_controller at %r %s:%d %s"
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23 % (co.co_name, co.co_filename, co.co_firstlineno, msg)
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24 )
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25
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26
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27 class HookCallError(Exception):
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28 """ Hook was called wrongly. """
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29
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30
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31 class _Result(object):
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32 def __init__(self, result, excinfo):
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33 self._result = result
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34 self._excinfo = excinfo
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35
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36 @property
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37 def excinfo(self):
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38 return self._excinfo
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39
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40 @property
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41 def result(self):
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42 """Get the result(s) for this hook call (DEPRECATED in favor of ``get_result()``)."""
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43 msg = "Use get_result() which forces correct exception handling"
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44 warnings.warn(DeprecationWarning(msg), stacklevel=2)
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45 return self._result
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46
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47 @classmethod
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48 def from_call(cls, func):
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49 __tracebackhide__ = True
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50 result = excinfo = None
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51 try:
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52 result = func()
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53 except BaseException:
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54 excinfo = sys.exc_info()
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55
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56 return cls(result, excinfo)
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57
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58 def force_result(self, result):
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59 """Force the result(s) to ``result``.
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60
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61 If the hook was marked as a ``firstresult`` a single value should
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62 be set otherwise set a (modified) list of results. Any exceptions
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63 found during invocation will be deleted.
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64 """
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65 self._result = result
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66 self._excinfo = None
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67
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68 def get_result(self):
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69 """Get the result(s) for this hook call.
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70
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71 If the hook was marked as a ``firstresult`` only a single value
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72 will be returned otherwise a list of results.
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73 """
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74 __tracebackhide__ = True
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75 if self._excinfo is None:
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76 return self._result
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77 else:
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78 ex = self._excinfo
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79 if _py3:
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80 raise ex[1].with_traceback(ex[2])
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81 _reraise(*ex) # noqa
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82
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83
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84 def _wrapped_call(wrap_controller, func):
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85 """ Wrap calling to a function with a generator which needs to yield
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86 exactly once. The yield point will trigger calling the wrapped function
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87 and return its ``_Result`` to the yield point. The generator then needs
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88 to finish (raise StopIteration) in order for the wrapped call to complete.
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89 """
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90 try:
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91 next(wrap_controller) # first yield
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92 except StopIteration:
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93 _raise_wrapfail(wrap_controller, "did not yield")
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94 call_outcome = _Result.from_call(func)
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95 try:
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96 wrap_controller.send(call_outcome)
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97 _raise_wrapfail(wrap_controller, "has second yield")
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98 except StopIteration:
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99 pass
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100 return call_outcome.get_result()
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101
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102
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103 class _LegacyMultiCall(object):
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104 """ execute a call into multiple python functions/methods. """
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105
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106 # XXX note that the __multicall__ argument is supported only
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107 # for pytest compatibility reasons. It was never officially
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108 # supported there and is explicitely deprecated since 2.8
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109 # so we can remove it soon, allowing to avoid the below recursion
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110 # in execute() and simplify/speed up the execute loop.
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111
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112 def __init__(self, hook_impls, kwargs, firstresult=False):
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113 self.hook_impls = hook_impls
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114 self.caller_kwargs = kwargs # come from _HookCaller.__call__()
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115 self.caller_kwargs["__multicall__"] = self
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116 self.firstresult = firstresult
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117
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118 def execute(self):
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119 caller_kwargs = self.caller_kwargs
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120 self.results = results = []
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121 firstresult = self.firstresult
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122
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123 while self.hook_impls:
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124 hook_impl = self.hook_impls.pop()
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125 try:
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126 args = [caller_kwargs[argname] for argname in hook_impl.argnames]
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127 except KeyError:
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128 for argname in hook_impl.argnames:
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129 if argname not in caller_kwargs:
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130 raise HookCallError(
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131 "hook call must provide argument %r" % (argname,)
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132 )
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133 if hook_impl.hookwrapper:
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134 return _wrapped_call(hook_impl.function(*args), self.execute)
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135 res = hook_impl.function(*args)
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136 if res is not None:
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137 if firstresult:
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138 return res
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139 results.append(res)
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140
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141 if not firstresult:
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142 return results
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143
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144 def __repr__(self):
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145 status = "%d meths" % (len(self.hook_impls),)
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146 if hasattr(self, "results"):
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147 status = ("%d results, " % len(self.results)) + status
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148 return "<_MultiCall %s, kwargs=%r>" % (status, self.caller_kwargs)
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149
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150
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151 def _legacymulticall(hook_impls, caller_kwargs, firstresult=False):
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152 return _LegacyMultiCall(
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153 hook_impls, caller_kwargs, firstresult=firstresult
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154 ).execute()
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155
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156
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157 def _multicall(hook_impls, caller_kwargs, firstresult=False):
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158 """Execute a call into multiple python functions/methods and return the
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159 result(s).
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160
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161 ``caller_kwargs`` comes from _HookCaller.__call__().
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162 """
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163 __tracebackhide__ = True
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164 results = []
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165 excinfo = None
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166 try: # run impl and wrapper setup functions in a loop
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167 teardowns = []
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168 try:
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169 for hook_impl in reversed(hook_impls):
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170 try:
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171 args = [caller_kwargs[argname] for argname in hook_impl.argnames]
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172 except KeyError:
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173 for argname in hook_impl.argnames:
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174 if argname not in caller_kwargs:
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175 raise HookCallError(
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176 "hook call must provide argument %r" % (argname,)
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177 )
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178
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179 if hook_impl.hookwrapper:
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180 try:
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181 gen = hook_impl.function(*args)
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182 next(gen) # first yield
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183 teardowns.append(gen)
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184 except StopIteration:
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185 _raise_wrapfail(gen, "did not yield")
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186 else:
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187 res = hook_impl.function(*args)
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188 if res is not None:
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189 results.append(res)
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190 if firstresult: # halt further impl calls
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191 break
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192 except BaseException:
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193 excinfo = sys.exc_info()
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194 finally:
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195 if firstresult: # first result hooks return a single value
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196 outcome = _Result(results[0] if results else None, excinfo)
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197 else:
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198 outcome = _Result(results, excinfo)
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199
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200 # run all wrapper post-yield blocks
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201 for gen in reversed(teardowns):
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202 try:
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203 gen.send(outcome)
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204 _raise_wrapfail(gen, "has second yield")
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205 except StopIteration:
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206 pass
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207
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208 return outcome.get_result()