python 中的 if while for 循環

直接貼例子：

IF 循環：

#!/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

print 'Done'

# This last statement is always executed, after the if

statement is executed

WHILE 循環：

# Filename: while.py

running = True

while running:

print 'Congratulations, you guessed it.'

running = False # this causes the while loop to

stop

print 'No, it is a little higher than that'

print 'The while loop is over.'

# Do anything else you want to do here

FOR 循環：

# Filename: for.py

for i in range(1, 5):

print i

print 'The for loop is over'

很遺憾Python中沒有switch-case 循環；