Passing package name and function name as variable in python

Question

I have a function defined in file f1.py as:

def fn1():
 return 1

def fn2():
 return 2

For learning exercise I am trying the following, which works:

import f1
from f1 import fn1, fn2

But the following approach doesn't work:

pkgName = 'f1'
fnName = 'fn1'
from pkgName import fnName

How can I pass package name and function name as variable?

Answer 1

You can use the __import__ function to import the module first, and then access the function as an attribute of the module object with getattr :

module_name = 'f1'
function_name = 'fn1'
fn = getattr(__import__(module_name, fromlist=[function_name]), function_name)
fn()