call function by its name

call_by_name.py

import sys

if sys.version_info[0] == 3:
    xrange = range

import functools

registered_functions = {}

def register_function(params):
    ps = params.split(',')

    def wrapper(func):
        def template(*args):

            if len(args) != len(ps):
                raise TypeError("%s() takes exactly %d positional argument"
                                " (%d given)" %\
                                (func.__name__, len(ps), len(args)))
            kwargs = {}
            for i in xrange(len(ps)):
                kwargs[ps[i]] = args[i]
            return func(**kwargs)
        registered_functions[func.__name__] = functools.update_wrapper(template, func)
    return wrapper

@register_function('sp_id,endpoint,env')
def sp_up(sp_id, env, endpoint):
    print("sp_id: %s" % sp_id)
    print("endpoint: %s" % endpoint)
    print("env: %s" % env)


target = 'sp.up'
params = ['foo', '127.0.0.1:1002', 'dev']

method = target.replace('.', '_')
method = registered_functions.get(method, None)

if method:
    method(*params)