While Loops

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")