Defining a Python function at runtime

Last Updated : 29 Dec, 2020

In Python,we can define a python function at runtime execute with the help of FunctionType(). First we import types module then perform compile() function and pass parameter exec and after that with the help FunctionType() define the function at runtime.

Example 1: Function to print GEEKSFORGEEKS.

Python3

# importing the module 
from types import FunctionType 
  
# functttion during run-time 
f_code = compile('def gfg(): return "GEEKSFORGEEKS"', "<string>", "exec") 
f_func = FunctionType(f_code.co_consts[0], globals(), "gfg") 
  
# calling the function 
print(f_func())

Output:

GEEKSFORGEEKS

Example 2: Function to add 2 numbers.

Python3

# importing the module 
from types import FunctionType 
  
# function at run-time 
f_code = compile('def gfg(a, b): return(a + b) ', "<int>", "exec") 
f_func = FunctionType(f_code.co_consts[0], globals(), "gfg") 
  
val1 = 3999
val2 =4999
  
# calliong the function 
print(f_func(val1, val2))

Output:

J

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