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While

1 p123 You can almost read while statement as if it were English. 
  code
# While syntax:
# 
# You can almost read while statement as if it were English:
#    - while n is greater than 0
#    - display n
#    - then decrement it
#
# The syntax is similar to a function definition.

def countdown(n):
    while(n > 0):
        print(n)
        n = n -1

countdown(5) # 5 4 3 2 1

Input

p123 Sometimes you want to take input from user until they type quit. 
  copy
while True:
    line = input('> ')
    if (line == 'quit'): 
        break
    print(line)

print('Done')

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