Python Beginner's Tutorial (17) Python's While loop

Python Loops

Python has two primitive loop commands:

• while loop
• for loop

while loop

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

an actual example

Prints i as long as i is less than 7:

i = 1
while i < 7:
  print(i)
  i += 1

running example

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Note: Remember to increment i or the loop will continue forever.

The while loop needs to have the relevant variables ready. In this example, we need to define an index variable i, which we will set to 1.

break statement

If we use the break statement, we can stop the loop even if the while condition is true:

an actual example Exit the loop when i equals 3:

i = 1
while i < 7:
  print(i)
  if i == 3:
    break
  i += 1

running example

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continue statement

If we use the continue statement, we can stop the current iteration and move on to the next one:

an actual example

If i equals 3, continue to the next iteration:

i = 0
while i < 7:
  i += 1 
  if i == 3:
    continue
  print(i)

running example

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else statement

By using the else statement, we can run the block once when the condition no longer holds:

an actual example

Prints a message when the condition is false:

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

running example

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i is no longer less than 6

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