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| CMSSW_5_3_X |
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| """functools.py - Tools for working with functions and callable objects | ||
| """ | ||
| # Python module wrapper for _functools C module | ||
| # to allow utilities written in Python to be added | ||
| # to the functools module. | ||
| # Written by Nick Coghlan <ncoghlan at gmail.com> | ||
| # Copyright (C) 2006 Python Software Foundation. | ||
| # See C source code for _functools credits/copyright | ||
|
|
||
| from _functools import partial, reduce | ||
|
|
||
| # update_wrapper() and wraps() are tools to help write | ||
| # wrapper functions that can handle naive introspection | ||
|
|
||
| WRAPPER_ASSIGNMENTS = ('__module__', '__name__', '__doc__') | ||
| WRAPPER_UPDATES = ('__dict__',) | ||
| def update_wrapper(wrapper, | ||
| wrapped, | ||
| assigned = WRAPPER_ASSIGNMENTS, | ||
| updated = WRAPPER_UPDATES): | ||
| """Update a wrapper function to look like the wrapped function | ||
| wrapper is the function to be updated | ||
| wrapped is the original function | ||
| assigned is a tuple naming the attributes assigned directly | ||
| from the wrapped function to the wrapper function (defaults to | ||
| functools.WRAPPER_ASSIGNMENTS) | ||
| updated is a tuple naming the attributes of the wrapper that | ||
| are updated with the corresponding attribute from the wrapped | ||
| function (defaults to functools.WRAPPER_UPDATES) | ||
| """ | ||
| for attr in assigned: | ||
| setattr(wrapper, attr, getattr(wrapped, attr)) | ||
| for attr in updated: | ||
| getattr(wrapper, attr).update(getattr(wrapped, attr, {})) | ||
| # Return the wrapper so this can be used as a decorator via partial() | ||
| return wrapper | ||
|
|
||
| def wraps(wrapped, | ||
| assigned = WRAPPER_ASSIGNMENTS, | ||
| updated = WRAPPER_UPDATES): | ||
| """Decorator factory to apply update_wrapper() to a wrapper function | ||
| Returns a decorator that invokes update_wrapper() with the decorated | ||
| function as the wrapper argument and the arguments to wraps() as the | ||
| remaining arguments. Default arguments are as for update_wrapper(). | ||
| This is a convenience function to simplify applying partial() to | ||
| update_wrapper(). | ||
| """ | ||
| return partial(update_wrapper, wrapped=wrapped, | ||
| assigned=assigned, updated=updated) | ||
|
|
||
| def total_ordering(cls): | ||
| """Class decorator that fills in missing ordering methods""" | ||
| convert = { | ||
| '__lt__': [('__gt__', lambda self, other: not (self < other or self == other)), | ||
| ('__le__', lambda self, other: self < other or self == other), | ||
| ('__ge__', lambda self, other: not self < other)], | ||
| '__le__': [('__ge__', lambda self, other: not self <= other or self == other), | ||
| ('__lt__', lambda self, other: self <= other and not self == other), | ||
| ('__gt__', lambda self, other: not self <= other)], | ||
| '__gt__': [('__lt__', lambda self, other: not (self > other or self == other)), | ||
| ('__ge__', lambda self, other: self > other or self == other), | ||
| ('__le__', lambda self, other: not self > other)], | ||
| '__ge__': [('__le__', lambda self, other: (not self >= other) or self == other), | ||
| ('__gt__', lambda self, other: self >= other and not self == other), | ||
| ('__lt__', lambda self, other: not self >= other)] | ||
| } | ||
| roots = set(dir(cls)) & set(convert) | ||
| if not roots: | ||
| raise ValueError('must define at least one ordering operation: < > <= >=') | ||
| root = max(roots) # prefer __lt__ to __le__ to __gt__ to __ge__ | ||
| for opname, opfunc in convert[root]: | ||
| if opname not in roots: | ||
| opfunc.__name__ = opname | ||
| opfunc.__doc__ = getattr(int, opname).__doc__ | ||
| setattr(cls, opname, opfunc) | ||
| return cls | ||
|
|
||
| def cmp_to_key(mycmp): | ||
| """Convert a cmp= function into a key= function""" | ||
| class K(object): | ||
| __slots__ = ['obj'] | ||
| def __init__(self, obj, *args): | ||
| self.obj = obj | ||
| def __lt__(self, other): | ||
| return mycmp(self.obj, other.obj) < 0 | ||
| def __gt__(self, other): | ||
| return mycmp(self.obj, other.obj) > 0 | ||
| def __eq__(self, other): | ||
| return mycmp(self.obj, other.obj) == 0 | ||
| def __le__(self, other): | ||
| return mycmp(self.obj, other.obj) <= 0 | ||
| def __ge__(self, other): | ||
| return mycmp(self.obj, other.obj) >= 0 | ||
| def __ne__(self, other): | ||
| return mycmp(self.obj, other.obj) != 0 | ||
| def __hash__(self): | ||
| raise TypeError('hash not implemented') | ||
| return K |
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