function to call

import sys

def wibble(a, b, foo='foo'):
    print(a, b, foo)
    
def wibble_without_kwargs(a, b):
    print(a, b)
    
def wibble_without_args(foo='foo'):
    print(foo)
    
def wibble_without_any_args():
    print('huhu')


# have to be in the same scope as wibble
def call_function_by_name(function_name, args=None, kwargs=None):
    if args is None:
        args = list()
    if kwargs is None:
        kwargs = dict()
    getattr(sys.modules[__name__], function_name)(*args, **kwargs)

    
call_function_by_name('wibble', args=['arg1', 'arg2'], kwargs={'foo': 'bar'})
call_function_by_name('wibble_without_kwargs', args=['arg1', 'arg2'])
call_function_by_name('wibble_without_args', kwargs={'foo': 'bar'})
call_function_by_name('wibble_without_any_args')
# output:
# arg1 arg2 bar
# arg1 arg2
# bar
# huhu