passing argument of outer function as argument for inner function in python?

Question

i want to use multiple functions via one outer function. the argument is a string and upon that string i want to create/pass arguments for inner functions. how is that possible?

def outer_function(arg1):
    
    arg2 = 'random_text' + str(arg1)
    arg3 = 'random_text' + str(arg1)
    
    def inner_function(arg2,arg3):
        global var
        do_something ...
    return inner_function()

my error i get is :

TypeError: inner_function() missing 2 required positional arguments:

inner_function(arg2, arg3)? The argument names of your inner_function as written shadow the names of those variables in your outer_function. Which means they get overwritten inside the inner_function by whatever arguments are passed when you call inner_function. — Green Cloak Guy
– Green Cloak Guy, Commented Dec 7, 2020 at 16:50
Just turn def inner_function(arg2,arg3): To def inner_function(): But seriously, what the point of doing so? — adir abargil
– adir abargil, Commented Dec 7, 2020 at 16:50
You don't have to pass the outer function variables as parameters to the inner function to use them from inner function, these variables are called closures, look them up. — Navaneeth Reddy Nalla
– Navaneeth Reddy Nalla, Commented Dec 7, 2020 at 16:51
Well, How about passing the needed arguments? return inner_function(arg2, arg3) — Tomerikoo
– Tomerikoo, Commented Dec 7, 2020 at 16:53

Samwise · Accepted Answer · 2020-12-07 16:52:30Z

3

Don't use global, and don't specify the variables as arguments if you're not passing them as arguments. Functions automatically have access to values from the enclosing scope.

def outer_function(arg1):
    arg2 = 'random_text' + str(arg1)
    arg3 = 'random_text' + str(arg1)

    def inner_function():
        return arg2 + arg3

    return inner_function()

>>> outer_function(" foo ")
'random_text foo random_text foo '

answered Dec 7, 2020 at 16:52

Samwise

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1 Comment

Navaneeth Reddy Nalla Over a year ago

Yes this is the right way to do it. I am surprised to see people skip over the topic of closure which is one of the easiest topics to learn in programming.

theCoder · Accepted Answer · 2020-12-07 16:54:33Z

0

You didn't passed arguments or parameters in return inner_funtion()below code can help

def outer_function(arg1):
    arg2 = 'random_text' + str(arg1)
    arg3 = 'random_text' + str(arg1)
    def inner_function(arg2,arg3):
        global var
        do_something ...
    return inner_function(arg2,arg3)

answered Dec 7, 2020 at 16:54

theCoder

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3 Comments

pofi Over a year ago

thank you this on helped. but after the first inner_function is executed it will stop and not execute the second. is there something i will have to add oder command?

pofi Over a year ago

i use multiple inner functions and they all have arg2 and arg3 as arguments#

theCoder Over a year ago

Can you elaborate

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