For and If Nested Together in Python

Introduction

In Python, for and if statements can be nested together to create more complex control structures. This allows programmers to perform operations on specific elements in a collection that meet certain conditions.

Syntax

The general syntax of a nested for and if statement is as follows:

for var in sequence:
    if condition:
        // statement(s)

• var: a variable that will take on each element in the sequence one at a time.
• sequence: a collection of elements that var will iterate through.
• condition: a logical expression that evaluates to either True or False.

Example

Let's say we have a list of numbers and we want to find all the even numbers:

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

for num in numbers:
    if num % 2 == 0: # check if the number is even
        print(num)

Output:

2
4
6
8
10

In this example, we use the % operator to check if the number is even. If the remainder is 0 when the number is divided by 2, then it's even.

Conclusion

Using for and if statements together allows programmers to perform operations on specific elements in a collection that meet certain conditions. This is a powerful tool that can simplify complex tasks in Python programming.