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/usr/lib/python2.7/dist-packages/wrapt/arguments.py is in python-wrapt 1.9.0-2.

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# This is a copy of the inspect.getcallargs() function from Python 2.7
# so we can provide it for use under Python 2.6. As the code in this
# file derives from the Python distribution, it falls under the version
# of the PSF license used for Python 2.7.

from inspect import getargspec, ismethod

def getcallargs(func, *positional, **named):
    """Get the mapping of arguments to values.

    A dict is returned, with keys the function argument names (including the
    names of the * and ** arguments, if any), and values the respective bound
    values from 'positional' and 'named'."""
    args, varargs, varkw, defaults = getargspec(func)
    f_name = func.__name__
    arg2value = {}

    # The following closures are basically because of tuple parameter unpacking.
    assigned_tuple_params = []
    def assign(arg, value):
        if isinstance(arg, str):
            arg2value[arg] = value
        else:
            assigned_tuple_params.append(arg)
            value = iter(value)
            for i, subarg in enumerate(arg):
                try:
                    subvalue = next(value)
                except StopIteration:
                    raise ValueError('need more than %d %s to unpack' %
                                     (i, 'values' if i > 1 else 'value'))
                assign(subarg,subvalue)
            try:
                next(value)
            except StopIteration:
                pass
            else:
                raise ValueError('too many values to unpack')
    def is_assigned(arg):
        if isinstance(arg,str):
            return arg in arg2value
        return arg in assigned_tuple_params
    if ismethod(func) and func.im_self is not None:
        # implicit 'self' (or 'cls' for classmethods) argument
        positional = (func.im_self,) + positional
    num_pos = len(positional)
    num_total = num_pos + len(named)
    num_args = len(args)
    num_defaults = len(defaults) if defaults else 0
    for arg, value in zip(args, positional):
        assign(arg, value)
    if varargs:
        if num_pos > num_args:
            assign(varargs, positional[-(num_pos-num_args):])
        else:
            assign(varargs, ())
    elif 0 < num_args < num_pos:
        raise TypeError('%s() takes %s %d %s (%d given)' % (
            f_name, 'at most' if defaults else 'exactly', num_args,
            'arguments' if num_args > 1 else 'argument', num_total))
    elif num_args == 0 and num_total:
        if varkw:
            if num_pos:
                # XXX: We should use num_pos, but Python also uses num_total:
                raise TypeError('%s() takes exactly 0 arguments '
                                '(%d given)' % (f_name, num_total))
        else:
            raise TypeError('%s() takes no arguments (%d given)' %
                            (f_name, num_total))
    for arg in args:
        if isinstance(arg, str) and arg in named:
            if is_assigned(arg):
                raise TypeError("%s() got multiple values for keyword "
                                "argument '%s'" % (f_name, arg))
            else:
                assign(arg, named.pop(arg))
    if defaults:    # fill in any missing values with the defaults
        for arg, value in zip(args[-num_defaults:], defaults):
            if not is_assigned(arg):
                assign(arg, value)
    if varkw:
        assign(varkw, named)
    elif named:
        unexpected = next(iter(named))
        if isinstance(unexpected, unicode):
            unexpected = unexpected.encode(sys.getdefaultencoding(), 'replace')
        raise TypeError("%s() got an unexpected keyword argument '%s'" %
                        (f_name, unexpected))
    unassigned = num_args - len([arg for arg in args if is_assigned(arg)])
    if unassigned:
        num_required = num_args - num_defaults
        raise TypeError('%s() takes %s %d %s (%d given)' % (
            f_name, 'at least' if defaults else 'exactly', num_required,
            'arguments' if num_required > 1 else 'argument', num_total))
    return arg2value