三种控制流语句——if
、while
和for
以及与它们相关的break
和continue
语句。它们是Python中最常用的部分,熟悉这些控制流是应当掌握的基本技能。
if例子和 while例子
number =23 flag = True count = 0 max = 5 while flag: guess = int(raw_input('enter an integer:')) count = count +1 if count >= max : print 'Game is over.you has used your times.try again later' flag = False if guess == number: print 'Congratulations,you win' flag = False elif guess < number: print 'less litter low...' else: print 'less litter larger...' else: print '' print 'game is over.'
for例子
#print range(1,5) for x in range(3): print x else: print 'The for loop is over'