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Python While Loops

Python has two primitive loop commands

Python Loops

Python has two primitive loop commands:

  • while loops
  • for loops

    • The while Loop

    With the while loop we can execute a set of statements as long as a condition is true.

    Example

    Print i as long as i is less than 6:

    i = 1
    while i < 6:
      print(i)
      i += 1

    Note: remember to increment i, or else the loop will continue forever.

    The while loop requires relevant variables to be ready, in this example we need to define an indexing variable, i, which we set to 1.

    The break Statement

    With the break statement we can stop the loop even if the while condition is true:

    Example

    Exit the loop when i is 3:

    i = 1
    while i < 6:
      print(i)
      if i == 3:
        break
      i += 1

    The continue Statement

    With the continue statement we can stop the current iteration, and continue with the next:

    Example

    Continue to the next iteration if i is 3:

    i = 0
    while i < 6:
      i += 1
      if i == 3:
        continue
      print(i)

    The else Statement

    With the else statement we can run a block of code once when the condition no longer is true:

    Example

    Print a message once the condition is false:

    i = 1
    while i < 6:
      print(i)
      i += 1
    else:
      print("i is no longer less than 6")

    Test Yourself With Exercises

    Exercise:

    Print i as long as i is less than 6.

    i = 1
 i < 6
  print(i)
  i += 1

    Start the Exercise

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