Python语言之控制流（if...elif...else,while,for,break,continue）

 1 number = 23
 2 guess = int(raw_input(‘Enter an integer : ‘))
 3 
 4 if guess == number:
 5     print( ‘Congratulations, you guessed it.‘ ) # New block starts here
 6     print( "(but you do not win any prizes!)" ) # New block ends here
 7 elif guess < number:
 8     print( ‘No, it is a little higher than that‘ )# Another block
 9 else:
10     print( ‘No, it is a little lower than that‘ )
11 
12 print( ‘Done‘ )
13 # This last statement is always executed, after the if statement is executed 

 1 number = 23
 2 running = True
 3 
 4 while running:
 5     guess = int(raw_input(‘Enter an integer : ‘))
 6 
 7     if guess == number:
 8         print ‘Congratulations, you guessed it.‘
 9         running = False # this causes the while loop to stop
10     elif guess < number:
11         print ‘No, it is a little higher than that‘
12     else:
13         print ‘No, it is a little lower than that‘
14 else:
15     print ‘The while loop is over.‘
16     # Do anything else you want to do here
17 
18 print ‘Done‘

1 for i in range(1, 5):
2     print i
3 else:
4     print ‘The for loop is over‘