Control flow of the Python language (if...elif...else,while,for,break,continue)

1.if...elif...else ...

1Number = 232guess = Int (raw_input ('Enter an integer:'))3 4 ifGuess = =Number :5     Print('Congratulations, you guessed it.')#New block starts here6     Print("(but don't win any prizes!)")#New block ends here7 elifGuess <Number :8     Print('No, it's a little higher than that')#another block9 Else:Ten     Print('No, it's a little lower than that' ) One  A Print(' Done' ) - #This last statement are always executed, after the IF statement is executed

2.while

1Number = 232running =True3 4  whileRunning:5guess = Int (raw_input ('Enter an integer:'))6 7     ifGuess = =Number :8         Print 'Congratulations, you guessed it.'9running = False#This causes the and loop to stopTen     elifGuess <Number : One         Print 'No, it's a little higher than that' A     Else: -         Print 'No, it's a little lower than that' - Else: the     Print 'The while loop was over .' -     #Do anything else want -  - Print ' Done'

When the loop condition becomes false, the else block is executed.

You might want to ask if such an else block will always be executed and what else will be done. Don't worry, there's a solution in 4.break.

3.for

1  for  in range (1, 5):2     print  i3else:  4     print'the ForLoopwas over'

Range (n, m [, steplen]) = [n,n+steplen,n+steplen*2,..., n+ (Ceil ((m-n)/steplen)-1) *steplen]

That is, starting with N, the Steplen is the step length, which is a sequence of less than m (not including m). By default, Steplen=1.

4.break

Terminates the current loop statement.

Note If you terminate from a for or while loop, any corresponding else will not be executed.

5.continue

Skips the remaining statements in the current loop block, and then proceeds to the next round of loops.

Control flow of the Python language (if...elif...else,while,for,break,continue)