Python For Loops

A for loop in Python is used to iterate over a sequence (such as a list, tuple, string, or range) and perform a certain action for each item in the sequence. For loops are useful when you want to repeat a block of code a fixed number of times or iterate over a collection of items.

Syntax

The syntax of a for loop in Python is as follows:

for item in sequence:
    # Execute these statements

In this syntax, item is a variable that will take on the value of each item in thesequence in each iteration of the loop.

Example

Here's an example of a for loop that iterates over a list of numbers and prints each number:

numbers = [1, 2, 3, 4, 5]
for num in numbers:
    print(num)

This loop will iterate over the list numbers and print each number on a new line.

Range Function

The range() function is often used with for loops to generate a sequence of numbers. For example, to iterate over numbers from 0 to 4:

for i in range(5):
    print(i)

The range() function generates a sequence of numbers from 0 to the specified number (exclusive), so range(5) generates 0, 1, 2, 3, 4.

Conclusion

For loops are a fundamental part of Python programming, allowing you to iterate over sequences and perform actions for each item in the sequence. By understanding how to use for loops, you can write more efficient and expressive Python code.