Calling a Function in Python
After creating a function in Python we can call it by using the name of the functions Python followed by parenthesis containing parameters of that particular function. Below is the example for calling def function Python.
# A simple Python function
def fun():
print(“Welcome to tech dcode”)
# Driver code to call a function
fun()
OUTPUT
Welcome to tech dcode
Python Function with Parameters
If you have experience in C/C++ or Java then you must be thinking about the return type of the function and data type of arguments. That is possible in Python as well .
Python Function Syntax with Parameters
def function_name(parameter: data_type) -> return_type:
"""Docstring"""
# body of the function
return expression
The following example uses arguments and parameters that you will learn later in this article so you can come back to it again if not understood.
def add(num1: int, num2: int) -> int:
“””Add two numbers”””
num3 = num1 + num2
return num3
# Driver code
num1, num2 = 5, 15
ans = add(num1, num2)
print(f”The addition of {num1} and {num2} results {ans}.”)
OUTPUT
The addition of 5 and 15 results 20. # some more functions def is_prime(n): if n in [2, 3]: return True if (n == 1) or (n % 2 == 0): return False r = 3 while r * r <= n: if n % r == 0: return False r += 2 return True print(is_prime(78), is_prime(79)) OUTPUT False True
Python Function Arguments
Arguments are the values passed inside the parenthesis of the function. A function can have any number of arguments separated by a comma.
In this example, we will create a simple function in Python to check whether the number passed as an argument to the function is even or odd.
# A simple Python function to check
# whether x is even or odd
def evenOdd(x):
if (x % 2 == 0):
print(“even”)
else:
print(“odd”)
# Driver code to call the function
evenOdd(2)
evenOdd(3)
OUTPUT
even
odd
Types of Python Function Arguments
Python supports various types of arguments that can be passed at the time of the function call. In Python, we have the following function argument types in Python:
- Default argument
- Keyword arguments (named arguments)
- Positional arguments
- Arbitrary arguments (variable-length arguments *args and **kwargs)