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    <pre class="lang-py prettyprint-override"><code>#! /usr/bin/env python import inspect from collections import namedtuple DefaultArgSpec = namedtuple('DefaultArgSpec', 'has_default default_value') def _get_default_arg(args, defaults, arg_index): """ Method that determines if an argument has default value or not, and if yes what is the default value for the argument :param args: array of arguments, eg: ['first_arg', 'second_arg', 'third_arg'] :param defaults: array of default values, eg: (42, 'something') :param arg_index: index of the argument in the argument array for which, this function checks if a default value exists or not. And if default value exists it would return the default value. Example argument: 1 :return: Tuple of whether there is a default or not, and if yes the default value, eg: for index 2 i.e. for "second_arg" this function returns (True, 42) """ if not defaults: return DefaultArgSpec(False, None) args_with_no_defaults = len(args) - len(defaults) if arg_index &lt; args_with_no_defaults: return DefaultArgSpec(False, None) else: value = defaults[arg_index - args_with_no_defaults] if (type(value) is str): value = '"%s"' % value return DefaultArgSpec(True, value) def get_method_sig(method): """ Given a function, it returns a string that pretty much looks how the function signature would be written in python. :param method: a python method :return: A string similar describing the pythong method signature. eg: "my_method(first_argArg, second_arg=42, third_arg='something')" """ # The return value of ArgSpec is a bit weird, as the list of arguments and # list of defaults are returned in separate array. # eg: ArgSpec(args=['first_arg', 'second_arg', 'third_arg'], # varargs=None, keywords=None, defaults=(42, 'something')) argspec = inspect.getargspec(method) arg_index=0 args = [] # Use the args and defaults array returned by argspec and find out # which arguments has default for arg in argspec.args: default_arg = _get_default_arg(argspec.args, argspec.defaults, arg_index) if default_arg.has_default: args.append("%s=%s" % (arg, default_arg.default_value)) else: args.append(arg) arg_index += 1 return "%s(%s)" % (method.__name__, ", ".join(args)) if __name__ == '__main__': def my_method(first_arg, second_arg=42, third_arg='something'): pass print get_method_sig(my_method) # my_method(first_argArg, second_arg=42, third_arg="something") </code></pre>
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    1. POHow can I read a function's signature including default argument values?
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