author | Joerg Sonnenberger <joerg@bec.de> |
Fri, 30 Apr 2021 02:11:58 +0200 | |
changeset 47043 | 12450fbea288 |
parent 37178 | 68ee61822182 |
permissions | -rw-r--r-- |
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############################################################################## |
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# |
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# Copyright (c) 2003 Zope Foundation and Contributors. |
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# All Rights Reserved. |
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# |
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# This software is subject to the provisions of the Zope Public License, |
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. |
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED |
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS |
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# FOR A PARTICULAR PURPOSE. |
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# |
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############################################################################## |
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"""Class advice. |
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|
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This module was adapted from 'protocols.advice', part of the Python |
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Enterprise Application Kit (PEAK). Please notify the PEAK authors |
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(pje@telecommunity.com and tsarna@sarna.org) if bugs are found or |
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Zope-specific changes are required, so that the PEAK version of this module |
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can be kept in sync. |
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|
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PEAK is a Python application framework that interoperates with (but does |
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not require) Zope 3 and Twisted. It provides tools for manipulating UML |
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models, object-relational persistence, aspect-oriented programming, and more. |
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Visit the PEAK home page at http://peak.telecommunity.com for more information. |
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""" |
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from __future__ import absolute_import |
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from types import FunctionType |
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try: |
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from types import ClassType |
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except ImportError: |
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__python3 = True |
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else: |
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__python3 = False |
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import sys |
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def getFrameInfo(frame): |
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"""Return (kind,module,locals,globals) for a frame |
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'kind' is one of "exec", "module", "class", "function call", or "unknown". |
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""" |
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f_locals = frame.f_locals |
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f_globals = frame.f_globals |
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sameNamespace = f_locals is f_globals |
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hasModule = '__module__' in f_locals |
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hasName = '__name__' in f_globals |
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sameName = hasModule and hasName |
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sameName = sameName and f_globals['__name__']==f_locals['__module__'] |
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module = hasName and sys.modules.get(f_globals['__name__']) or None |
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namespaceIsModule = module and module.__dict__ is f_globals |
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if not namespaceIsModule: |
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# some kind of funky exec |
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kind = "exec" |
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elif sameNamespace and not hasModule: |
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kind = "module" |
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elif sameName and not sameNamespace: |
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kind = "class" |
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elif not sameNamespace: |
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kind = "function call" |
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else: # pragma: no cover |
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# How can you have f_locals is f_globals, and have '__module__' set? |
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# This is probably module-level code, but with a '__module__' variable. |
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kind = "unknown" |
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return kind, module, f_locals, f_globals |
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|
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def addClassAdvisor(callback, depth=2): |
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"""Set up 'callback' to be passed the containing class upon creation |
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This function is designed to be called by an "advising" function executed |
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in a class suite. The "advising" function supplies a callback that it |
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wishes to have executed when the containing class is created. The |
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callback will be given one argument: the newly created containing class. |
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The return value of the callback will be used in place of the class, so |
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the callback should return the input if it does not wish to replace the |
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class. |
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The optional 'depth' argument to this function determines the number of |
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frames between this function and the targeted class suite. 'depth' |
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defaults to 2, since this skips this function's frame and one calling |
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function frame. If you use this function from a function called directly |
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in the class suite, the default will be correct, otherwise you will need |
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to determine the correct depth yourself. |
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|
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This function works by installing a special class factory function in |
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place of the '__metaclass__' of the containing class. Therefore, only |
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callbacks *after* the last '__metaclass__' assignment in the containing |
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class will be executed. Be sure that classes using "advising" functions |
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declare any '__metaclass__' *first*, to ensure all callbacks are run.""" |
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# This entire approach is invalid under Py3K. Don't even try to fix |
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# the coverage for this block there. :( |
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if __python3: # pragma: no cover |
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raise TypeError('Class advice impossible in Python3') |
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frame = sys._getframe(depth) |
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kind, module, caller_locals, caller_globals = getFrameInfo(frame) |
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# This causes a problem when zope interfaces are used from doctest. |
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# In these cases, kind == "exec". |
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# |
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#if kind != "class": |
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# raise SyntaxError( |
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# "Advice must be in the body of a class statement" |
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113 |
# ) |
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114 |
|
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115 |
previousMetaclass = caller_locals.get('__metaclass__') |
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116 |
if __python3: # pragma: no cover |
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117 |
defaultMetaclass = caller_globals.get('__metaclass__', type) |
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118 |
else: |
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119 |
defaultMetaclass = caller_globals.get('__metaclass__', ClassType) |
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120 |
|
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121 |
|
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122 |
def advise(name, bases, cdict): |
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123 |
|
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124 |
if '__metaclass__' in cdict: |
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125 |
del cdict['__metaclass__'] |
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126 |
|
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127 |
if previousMetaclass is None: |
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128 |
if bases: |
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129 |
# find best metaclass or use global __metaclass__ if no bases |
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130 |
meta = determineMetaclass(bases) |
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131 |
else: |
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132 |
meta = defaultMetaclass |
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133 |
|
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134 |
elif isClassAdvisor(previousMetaclass): |
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135 |
# special case: we can't compute the "true" metaclass here, |
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136 |
# so we need to invoke the previous metaclass and let it |
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137 |
# figure it out for us (and apply its own advice in the process) |
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138 |
meta = previousMetaclass |
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139 |
|
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140 |
else: |
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141 |
meta = determineMetaclass(bases, previousMetaclass) |
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142 |
|
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143 |
newClass = meta(name,bases,cdict) |
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144 |
|
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145 |
# this lets the callback replace the class completely, if it wants to |
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146 |
return callback(newClass) |
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147 |
|
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148 |
# introspection data only, not used by inner function |
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149 |
advise.previousMetaclass = previousMetaclass |
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150 |
advise.callback = callback |
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151 |
|
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152 |
# install the advisor |
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153 |
caller_locals['__metaclass__'] = advise |
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154 |
|
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155 |
|
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156 |
def isClassAdvisor(ob): |
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157 |
"""True if 'ob' is a class advisor function""" |
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158 |
return isinstance(ob,FunctionType) and hasattr(ob,'previousMetaclass') |
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159 |
|
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160 |
|
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161 |
def determineMetaclass(bases, explicit_mc=None): |
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162 |
"""Determine metaclass from 1+ bases and optional explicit __metaclass__""" |
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163 |
|
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164 |
meta = [getattr(b,'__class__',type(b)) for b in bases] |
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165 |
|
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166 |
if explicit_mc is not None: |
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167 |
# The explicit metaclass needs to be verified for compatibility |
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168 |
# as well, and allowed to resolve the incompatible bases, if any |
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169 |
meta.append(explicit_mc) |
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170 |
|
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171 |
if len(meta)==1: |
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172 |
# easy case |
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173 |
return meta[0] |
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174 |
|
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175 |
candidates = minimalBases(meta) # minimal set of metaclasses |
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176 |
|
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177 |
if not candidates: # pragma: no cover |
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178 |
# they're all "classic" classes |
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179 |
assert(not __python3) # This should not happen under Python 3 |
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180 |
return ClassType |
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181 |
|
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182 |
elif len(candidates)>1: |
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183 |
# We could auto-combine, but for now we won't... |
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184 |
raise TypeError("Incompatible metatypes",bases) |
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185 |
|
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186 |
# Just one, return it |
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187 |
return candidates[0] |
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188 |
|
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189 |
|
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190 |
def minimalBases(classes): |
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191 |
"""Reduce a list of base classes to its ordered minimum equivalent""" |
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192 |
|
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193 |
if not __python3: # pragma: no cover |
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194 |
classes = [c for c in classes if c is not ClassType] |
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195 |
candidates = [] |
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196 |
|
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197 |
for m in classes: |
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198 |
for n in classes: |
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199 |
if issubclass(n,m) and m is not n: |
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200 |
break |
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201 |
else: |
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|
202 |
# m has no subclasses in 'classes' |
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203 |
if m in candidates: |
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204 |
candidates.remove(m) # ensure that we're later in the list |
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205 |
candidates.append(m) |
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206 |
|
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207 |
return candidates |