author | johnathan.white@2718R8BGH51.accenture.com |
Mon, 08 Mar 2010 18:45:03 +0000 | |
changeset 46 | b6935a90ca64 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`functools` --- Higher order functions and operations on callable objects |
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============================================================================== |
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.. module:: functools |
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:synopsis: Higher order functions and operations on callable objects. |
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.. moduleauthor:: Peter Harris <scav@blueyonder.co.uk> |
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.. moduleauthor:: Raymond Hettinger <python@rcn.com> |
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.. moduleauthor:: Nick Coghlan <ncoghlan@gmail.com> |
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.. sectionauthor:: Peter Harris <scav@blueyonder.co.uk> |
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.. versionadded:: 2.5 |
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The :mod:`functools` module is for higher-order functions: functions that act on |
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or return other functions. In general, any callable object can be treated as a |
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function for the purposes of this module. |
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The :mod:`functools` module defines the following functions: |
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.. function:: reduce(function, iterable[, initializer]) |
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This is the same function as :func:`reduce`. It is made available in this module |
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to allow writing code more forward-compatible with Python 3. |
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.. versionadded:: 2.6 |
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.. function:: partial(func[,*args][, **keywords]) |
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Return a new :class:`partial` object which when called will behave like *func* |
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called with the positional arguments *args* and keyword arguments *keywords*. If |
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more arguments are supplied to the call, they are appended to *args*. If |
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additional keyword arguments are supplied, they extend and override *keywords*. |
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Roughly equivalent to:: |
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def partial(func, *args, **keywords): |
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def newfunc(*fargs, **fkeywords): |
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newkeywords = keywords.copy() |
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newkeywords.update(fkeywords) |
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return func(*(args + fargs), **newkeywords) |
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newfunc.func = func |
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newfunc.args = args |
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newfunc.keywords = keywords |
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return newfunc |
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The :func:`partial` is used for partial function application which "freezes" |
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some portion of a function's arguments and/or keywords resulting in a new object |
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with a simplified signature. For example, :func:`partial` can be used to create |
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a callable that behaves like the :func:`int` function where the *base* argument |
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defaults to two: |
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>>> from functools import partial |
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>>> basetwo = partial(int, base=2) |
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>>> basetwo.__doc__ = 'Convert base 2 string to an int.' |
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>>> basetwo('10010') |
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.. function:: update_wrapper(wrapper, wrapped[, assigned][, updated]) |
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Update a *wrapper* function to look like the *wrapped* function. The optional |
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arguments are tuples to specify which attributes of the original function are |
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assigned directly to the matching attributes on the wrapper function and which |
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attributes of the wrapper function are updated with the corresponding attributes |
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from the original function. The default values for these arguments are the |
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module level constants *WRAPPER_ASSIGNMENTS* (which assigns to the wrapper |
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function's *__name__*, *__module__* and *__doc__*, the documentation string) and |
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*WRAPPER_UPDATES* (which updates the wrapper function's *__dict__*, i.e. the |
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instance dictionary). |
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The main intended use for this function is in :term:`decorator` functions which |
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wrap the decorated function and return the wrapper. If the wrapper function is |
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not updated, the metadata of the returned function will reflect the wrapper |
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definition rather than the original function definition, which is typically less |
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than helpful. |
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.. function:: wraps(wrapped[, assigned][, updated]) |
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This is a convenience function for invoking ``partial(update_wrapper, |
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wrapped=wrapped, assigned=assigned, updated=updated)`` as a function decorator |
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when defining a wrapper function. For example: |
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>>> from functools import wraps |
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>>> def my_decorator(f): |
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... @wraps(f) |
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... def wrapper(*args, **kwds): |
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... print 'Calling decorated function' |
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... return f(*args, **kwds) |
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... return wrapper |
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... |
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>>> @my_decorator |
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... def example(): |
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... """Docstring""" |
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... print 'Called example function' |
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... |
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>>> example() |
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Calling decorated function |
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Called example function |
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>>> example.__name__ |
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'example' |
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>>> example.__doc__ |
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'Docstring' |
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Without the use of this decorator factory, the name of the example function |
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would have been ``'wrapper'``, and the docstring of the original :func:`example` |
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108 |
would have been lost. |
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109 |
|
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110 |
|
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111 |
.. _partial-objects: |
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112 |
|
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113 |
:class:`partial` Objects |
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114 |
------------------------ |
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115 |
|
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:class:`partial` objects are callable objects created by :func:`partial`. They |
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have three read-only attributes: |
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118 |
|
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119 |
|
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.. attribute:: partial.func |
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121 |
|
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A callable object or function. Calls to the :class:`partial` object will be |
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forwarded to :attr:`func` with new arguments and keywords. |
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124 |
|
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125 |
|
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.. attribute:: partial.args |
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127 |
|
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The leftmost positional arguments that will be prepended to the positional |
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arguments provided to a :class:`partial` object call. |
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130 |
|
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131 |
|
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.. attribute:: partial.keywords |
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133 |
|
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The keyword arguments that will be supplied when the :class:`partial` object is |
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called. |
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136 |
|
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:class:`partial` objects are like :class:`function` objects in that they are |
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callable, weak referencable, and can have attributes. There are some important |
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differences. For instance, the :attr:`__name__` and :attr:`__doc__` attributes |
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are not created automatically. Also, :class:`partial` objects defined in |
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classes behave like static methods and do not transform into bound methods |
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during instance attribute look-up. |
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143 |