Metadata-Version: 1.1
Name: wrapt
Version: 1.12.1
Summary: Module for decorators, wrappers and monkey patching.
Home-page: https://github.com/GrahamDumpleton/wrapt
Author: Graham Dumpleton
Author-email: Graham.Dumpleton@gmail.com
License: BSD
Description: wrapt
        =====
        
        |Travis| |AppVeyor| |Coveralls| |PyPI|
        
        The aim of the **wrapt** module is to provide a transparent object proxy
        for Python, which can be used as the basis for the construction of function
        wrappers and decorator functions.
        
        The **wrapt** module focuses very much on correctness. It therefore goes
        way beyond existing mechanisms such as ``functools.wraps()`` to ensure that
        decorators preserve introspectability, signatures, type checking abilities
        etc. The decorators that can be constructed using this module will work in
        far more scenarios than typical decorators and provide more predictable and
        consistent behaviour.
        
        To ensure that the overhead is as minimal as possible, a C extension module
        is used for performance critical components. An automatic fallback to a
        pure Python implementation is also provided where a target system does not
        have a compiler to allow the C extension to be compiled.
        
        Documentation
        -------------
        
        For further information on the **wrapt** module see:
        
        * http://wrapt.readthedocs.org/
        
        Quick Start
        -----------
        
        To implement your decorator you need to first define a wrapper function.
        This will be called each time a decorated function is called. The wrapper
        function needs to take four positional arguments:
        
        * ``wrapped`` - The wrapped function which in turns needs to be called by your wrapper function.
        * ``instance`` - The object to which the wrapped function was bound when it was called.
        * ``args`` - The list of positional arguments supplied when the decorated function was called.
        * ``kwargs`` - The dictionary of keyword arguments supplied when the decorated function was called.
        
        The wrapper function would do whatever it needs to, but would usually in
        turn call the wrapped function that is passed in via the ``wrapped``
        argument.
        
        The decorator ``@wrapt.decorator`` then needs to be applied to the wrapper
        function to convert it into a decorator which can in turn be applied to
        other functions.
        
        ::
        
            import wrapt
            
            @wrapt.decorator
            def pass_through(wrapped, instance, args, kwargs):
                return wrapped(*args, **kwargs)
        
            @pass_through
            def function():
                pass
        
        If you wish to implement a decorator which accepts arguments, then wrap the
        definition of the decorator in a function closure. Any arguments supplied
        to the outer function when the decorator is applied, will be available to
        the inner wrapper when the wrapped function is called.
        
        ::
        
            import wrapt
        
            def with_arguments(myarg1, myarg2):
                @wrapt.decorator
                def wrapper(wrapped, instance, args, kwargs):
                    return wrapped(*args, **kwargs)
                return wrapper
        
            @with_arguments(1, 2)
            def function():
                pass
        
        When applied to a normal function or static method, the wrapper function
        when called will be passed ``None`` as the ``instance`` argument.
        
        When applied to an instance method, the wrapper function when called will
        be passed the instance of the class the method is being called on as the
        ``instance`` argument. This will be the case even when the instance method
        was called explicitly via the class and the instance passed as the first
        argument. That is, the instance will never be passed as part of ``args``.
        
        When applied to a class method, the wrapper function when called will be
        passed the class type as the ``instance`` argument.
        
        When applied to a class, the wrapper function when called will be passed
        ``None`` as the ``instance`` argument. The ``wrapped`` argument in this
        case will be the class.
        
        The above rules can be summarised with the following example.
        
        ::
        
            import inspect
            
            @wrapt.decorator
            def universal(wrapped, instance, args, kwargs):
                if instance is None:
                    if inspect.isclass(wrapped):
                        # Decorator was applied to a class.
                        return wrapped(*args, **kwargs)
                    else:
                        # Decorator was applied to a function or staticmethod.
                        return wrapped(*args, **kwargs)
                else:
                    if inspect.isclass(instance):
                        # Decorator was applied to a classmethod.
                        return wrapped(*args, **kwargs)
                    else:
                        # Decorator was applied to an instancemethod.
                        return wrapped(*args, **kwargs)
        
        Using these checks it is therefore possible to create a universal decorator
        that can be applied in all situations. It is no longer necessary to create
        different variants of decorators for normal functions and instance methods,
        or use additional wrappers to convert a function decorator into one that
        will work for instance methods.
        
        In all cases, the wrapped function passed to the wrapper function is called
        in the same way, with ``args`` and ``kwargs`` being passed. The
        ``instance`` argument doesn't need to be used in calling the wrapped
        function.
        
        Repository
        ----------
        
        Full source code for the **wrapt** module, including documentation files
        and unit tests, can be obtained from github.
        
        * https://github.com/GrahamDumpleton/wrapt
        
        .. |Travis| image:: https://travis-ci.org/GrahamDumpleton/wrapt.svg?branch=develop
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           :target: https://ci.appveyor.com/project/GrahamDumpleton/wrapt/branch/develop
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        .. |PyPI| image:: https://img.shields.io/pypi/v/wrapt.svg
           :target: https://pypi.python.org/pypi/wrapt
        
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: License :: OSI Approved :: BSD License
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
