python 中的 if while for 循环

opo

直接贴例子：

IF 循环：
#!/usr/bin/python
# Filename: if.py

number = 23
guess = int(raw_input('Enter an integer : '))

if guess == number:
        print 'Congratulations, you guessed it.' # New block starts here
        print "(but you do not win any prizes!)" # New block ends here
elif guess < number:
        print 'No, it is a little higher than that' # Another block
        # You can do whatever you want in a block ...
else:
        print 'No, it is a little lower than that'
        # you must have guess > number to reach here

print 'Done'
# This last statement is always executed, after the if statement is executed

WHILE 循环：

#!/usr/bin/python
# Filename: while.py

number = 23
running = True

while running:
guess = int(raw_input('Enter an integer : '))

if guess == number:
        print 'Congratulations, you guessed it.'
        running = False # this causes the while loop to stop
elif guess < number:
        print 'No, it is a little higher than that'
else:
        print 'No, it is a little lower than that'
else:
        print 'The while loop is over.'
# Do anything else you want to do here

print 'Done'


FOR 循环：

#!/usr/bin/python
# Filename: for.py

for i in range(1, 5):
        print i
else:
        print 'The for loop is over'

很遗憾Python中没有switch-case 循环；

kinght2008

解释就是掩饰，掩饰就是编故事!

hncys

我喜欢孩子，更喜欢造孩子的过程!

xuxiaohui9216

走，MM，咱们化蝶去……

wzh789

男人在结婚前觉得适合自己的女人很少，结婚后觉得适合自己的女人很多。

重温战场

找不到恐龙，就用蜥蜴顶

shawnmei

我身在江湖，江湖里却没有我得传说。