Python - For Loop

Introduction

Python's for loop is an effective tool that lets you iterate over a list of elements. This guide offers explanations of the syntax and application of the for loop in addition to useful examples that highlight its adaptability.

# Iterating over elements in a list

fruits = ['mango', 'orange', 'grape']

# Loop through each fruit in the list
for fruit in fruits:
    # Print each fruit
    print(fruit)

Range Function

The range() function is often used with `for` loops to generate a sequence of numbers.

Example :

# Example: Using range in a for loop

for number in range(1, 5):
    # Print each number
    print(number)

Example:

# Example: Nested loop

for i in range(3):

    # Outer loop
    for j in range(2):

        # Inner loop
        print(f'Outer loop: {i}, Inner loop: {j}')

Else Clause

When a `for` loop reaches the end of its iterable or the loop condition changes to `False`, the `else` clause is triggered. If a `break` statement ends the loop, it is not carried out.

Example :

# Example: For loop with else clause

for i in range(5):
    # Loop body
    print(i)

else:
    # Executed when the loop completes without a 'break'
    print('Loop completed without break')

Notes

- The `for` loop is a flexible loop that may iterate over a variety of data structures, including strings, tuples, lists, and more.
- `range()` is a frequently used function for creating numerical sequences for iteration.
- You can iterate over several dimensions or sequences using nested loops.

Conclusion

Mastering the `for` loop is essential for efficient and concise iteration in Python. Whether working with simple sequences or dealing with nested structures, the `for` loop provides a flexible and powerful tool for handling repetitive tasks in your code.