Key Concepts

Review core concepts you need to learn to master this subject

Functions

Function Keyword Arguments

Function Parameters

Function Arguments

Returning Value from Function

Multiple Parameters

Calling Functions

Recursion in Python

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Functions

# Define a function my_function() with parameter x

def my_function(x):
  return x + 1

# Invoke the function

print(my_function(2))      # Output: 3
print(my_function(3 + 5))  # Output: 9

Some tasks need to be performed multiple times within a program. Rather than rewrite the same code in multiple places, a function may be defined using the def keyword. Function definitions may include parameters, providing data input to the function.

Functions may return a value using the return keyword followed by the value to return.