Python: Control Structures

[last updated: 2024-09-21]
Python home page
Python: Programming
-----

On this page:

• For
• If
• While

-----

• For loop:
  for x in range(0, 3):
       [statements]

  the 'range' can be a predefined list, eg:
  listToRun = {1, 4, 6, 7}
  for x in listToRun:
       [statements]
  
  If you want to break out of the for-loop before it's done:
  if [expression]:
       if [expression]:
            break

• If test:
  if [expression]:
       [statements]
  else:
       [statements]

  The [expression] can be any statement that evaluates to T/F
  The else statement is optional but there can only be one of them at most.

  
  If you have more than one 'else' condition to test, use elif:
  if [expression]:
       [statements]
  elif [expression]:
       [statements]
  elif [expression]:
       [statements]

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

.

.

.

eof