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python 练习2

2017-08-26 00:12 148 查看

练习题

1.用户输入一个数字，判断是否为质数

#!/usr/bin/env python
#coding:utf-8
"""
file:.py
date:2017/8/25 21:34
author:    peak
description:
"""
while True:
Num=input("please input a number :")
if Num <=1 :
print "it is not a prime number !"
elif Num == 2:
print "it is a prime number : 2"
for i in range(2,Num):
if Num % i == 0 :
print "it is not a prime number : {} * {} ={}" .format(i,Num/i,Num)
break
else :
print "it is a prime number: {} % {} != 0" .format(Num,i)
break
Choose=raw_input("do you want to continue to judge prime? (yes/no) :")
if Choose == "no":
break

– 运行结果：

2.处理字符串”1Xa7YzU”,最终分别打印数字，大写字母和小写字母;

代码：

#!/usr/bin/env python
#coding:utf-8
"""
file:.py
date:2017/8/25 22:11
author:    peak
description:
"""
Upper=""
Lower=""
Digit=""
Str=raw_input("please input a string that you want to sort :")
for i in Str:
if i.islower():
Lower += i
elif i.isupper():
Upper += i
elif i.isdigit():
Digit += i
print "Lower of string are : {}" .format(Lower)
print "Upper of string are : {}" .format(Upper)
print "Digit of string are : {}" .format(Digit)

运行结果：

- 3.编写一个python脚本，判断用户输入的变量名是否合法? (首位为字母或下划线，其他为数字，字母或下划线)

#!/usr/bin/env python
#coding:utf-8
"""
file:.py
date:2017/8/25 22:25
author:    peak
description:
"""
import string
Vari=raw_input("please input the variants name : ")
Length=len(Vari)
Length1=len(string.letters+"_")
count=0
count1=0
for n in string.letters + "_" :
if Vari[0]== n:
for i in Vari :
for m in string.letters + "_" + string.digits:
if i == m :
count+=1
if count == Length:
print "the variants'name is legal ! "

else :
print "the variants'name is illegal ! "
else:
count1+=1
if count1==53:
print "the variants'name is illegal ! "

结果：