For Loop

Introduction:

  • A for loop in Python can be used to iterate over a set of statements once for each item in a sequence or collection. This sequence could be a range, list, tuple, dictionary, set, or a string.

Syntax:

python
for item in iterable:
    statement(s)
  • iterable could be a sequence or collection, and item is the variable that holds the value of the current element in the loop.

Examples:

  1. For Loop with Range:

    • Iterating over a range of numbers.

      python
      for i in range(25, 29):
    print(i)

    • Output:

       
      25
26
27
28
  2. For Loop with String:

    • Iterating over the characters of a string.

      python
      my_string = 'apple'

for x in my_string:
    print(x)

    • Output:

       
      a
p
p
l
e
  3. Using break in For Loop:

    • Breaking the loop when a specific condition is met.

      python
      for x in range(2, 10):
    if x == 7:
        break
    print(x)

    • Output:

       
      2
3
4
5
6
  4. Using continue in For Loop:

    • Skipping the current iteration when a specific condition is met.

      python
      for x in range(2, 10):
    if x == 7:
        continue
    print(x)

    • Output:

       
      2
3
4
5
6
8
9
  5. Nested For Loop:

    • Writing a for loop inside another for loop.

      python
      for x in range(5):
    for y in range(6):
        print(x, end=' ')
    print()

    • Output:

       
      0 0 0 0 0 0
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
4 4 4 4 4 4

Exercises:

  1. Use break in a Loop:

    • Use a for loop to print numbers from 1 to 10. Break the loop if the number is 5.

      python
      for i in range(1, 11):
    if i == 5:
        break
    print(i)
  2. Use continue in a Loop:

    • Use a for loop to print numbers from 1 to 10. Skip the number 5.

      python
      for i in range(1, 11):
    if i == 5:
        continue
    print(i)

Summary:

  • In this tutorial, we learned how to use Python For Loop with different collections and control statements like break, continue, and else blocks. Practice these examples to become proficient in using for loops in your Python programs!