python 练习2

最新推荐文章于 2025-08-20 15:37:55 发布

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最新推荐文章于 2025-08-20 15:37:55 发布

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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 ! "