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条件语句
有的程序里写的是 /usr/bin Python,表示 Python 解释器在/usr/bin 里面。但是,如果写成 /usr/bin/env,则表示要通过系统搜索路径寻找 Python 解释器。不同系统,可
能解释器的位置不同,所以这种方式能够让代码更将拥有可移植性。
#/usr/bin/env python #coding=utf-8 number = int(raw_input("请输入任意一个整数:")) if number == 10: print "您输入的数字是: %d"%number elif number > 10: print "This number is more than 10." elif number < 10: print "This number is less than 10." else: print "Are you a human?"
三元操作符
三元操作,是条件语句中比较简练的一种赋值方式,它的模样是这样的:
>>> a = "5" if 6>5 else 3 >>> a ‘5‘ >>> a = "5" if 6<5 else 3 >>> a 3
循环语句
for
#/usr/bin/env python fruits=["apple","orange","banana"] for i in fruits: print i
多个
a=[(1,2),(3,4),(5,6)] d=[] for x,y in a: d.append(x+y) print d
while
#!/usr/bin/env python
#coding:utf-8
a = 9
while a:
if a%2 == 0:
break
else:
print "%d is odd number"%a
a = 0
print "%d is even number"%a
while...else
一遇到 else 了,就意味着已经不在 while 循环内了。
#!/usr/bin/env Python count = 0 while count < 5: print count, " is less than 5" count = count + 1 else: print count, " is not less than 5"
for...else
这个循环也通常用在当跳出循环之后要做的事情。
#!/usr/bin/env python # coding=utf-8 from math import sqrt for n in range(99, 1, -1): root = sqrt(n) if root == int(root): print n break else: print "Nothing."
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原文地址:http://www.cnblogs.com/zydev/p/5842982.html