Python — Different Ways to Call Function

How to call a function in Python?

Directly Function Call

This is the simplest and most intuitive way:

def test():
    print("This is a test")test()

Use partial() Function

In the built-in library of functools, there is a partial method dedicated to generating partial functions.

def power(x, n):
    s = 1
    while n > 0:
        n = n - 1
        s = s * x
    return s

from functools import partial
power_2 = partial(power, n=2)
power_2(3)  # output: 9
power_2(4)  # output: 16

Use eval()

If you need to execute the function dynamically, you can use eval + string to execute the function.

# demo.pyimport sys
def pre_task():
    print("running pre_task")
def task():
    print("running task")
def post_task():
    print("running post_task")
argvs = sys.argv[1:]
for action in argvs:
    eval(action)()

To execute:

$ python demo.py pre_task task post_task
running pre_task
running task
running post_task

Use getattr()

If you put all the functions in the class and define them as static methods, you can use getattr() to…