python 02

1.判断用户输入的变量名是否合法：

#!/usr/bin/env python
import string

name = raw_input("name:")
if name[0] in string.letters+"_":
        for i in name[1:]:
                if i not in string.letters + "_" + string.digits:
                        print "name is wrong!!!"
                        exit(0)
        print "name is right"
else:
        print "name is wrong,please input right name!!!"

2.用户输入一个数字，判断是否为质数

#!/usr/bin/env python
num = input("num:")
if num > 1:
        for i in range(2,num):
                if (num % i) == 0:
                        print (num,"is not zhishu")
                        break
        else:
                print (num,"is zhishu")
else:
        print (num,"is not zhishu")

思维脑图链接：
这里写链接内容