# Basic Python method
class class_name
    def method_name () :
        ......
        # method body
        ......  

# Python 3  User-Defined  Method
class ABC :
    def method_abc (self):
        print("I am in method_abc of ABC class. ")
 
class_ref = ABC() # object of ABC class
class_ref.method_abc()

 I am in method_abc of ABC class

import math
 
ceil_val = math.ceil(15.25)
print( "Ceiling value of 15.25 is : ", ceil_val)

Ceiling value of 15.25 is :  16

def function_name ( arg1, arg2, ...) :
    ......
    # function body
    ......  

def Subtract (a, b):
    return (a-b)
 
print( Subtract(10, 12) ) # prints -2
 
print( Subtract(15, 6) ) # prints 9

-2
9

s = sum([5, 15, 2])
print( s ) # prints 22
 
mx = max(15, 6)
print( mx ) # prints 15

22
15