练习题

1.计算100-300之间所有能被3和7整除的所有数之和

sum=0
for i in range(100,301):
    if i%3==0 and i%7==0:
        sum=sum+i
        #sum+=i
print(sum)

2.定义一个函数统计字符串中大写字母，小写字母，数字的个数，并返回结果

l=[]
def func(arg):
    num=0
    sum_num=0
    low_num=0
    upp_num=0
    for i in arg:
        #print(i)
        if i.isdigit():
            sum_num+=1
        elif i.islower():
            low_num+=1
        elif i.isupper():
            upp_num+=1
        else:
            num+=1

    l.append(sum_num), l.append(low_num), l.append(upp_num), l.append(num)
    return l

r=func('165AAA1dd   dd')
print(r)

3.获取两个列表l1=[11,22,22],l2=[22,33,44]中相同的元素集合

l1=[11,22,33]
l2=[22,33,44]
l3=[]
for i in l1:
    for j in l2:
        if i==j:
            l3.append(i)

print(l3)

4.将字符串老男人转化成utf-8编码的字节类型

str='老男人'
print(bytes(str,encoding="utf-8"))

5.利用内置函数zip(),实现功能
zip() 函数用于将可迭代的对象作为参数，将对象中对应的元素打包成一个个元组，然后返回由这些元组组成的列表。
l1=['wo',11,22,33]
l2=['shi',11,22,33]
l3=['zhong',11,22,33]
l4=['guo',11,22,33]
l5=['ren',11,22,33]
请获取字符串s="wo shi zhong guo ren"

import zip

l1=['wo',11,22,33]
l2=['shi',11,22,33]
l3=['zhong',11,22,33]
l4=['guo',11,22,33]
l5=['ren',11,22,33]
s=list(zip(l1,l2,l3,l4,l5))[0]
print(" ".join(s))

6.注册登录并加密

import haslib

def func_md5(arg):
    hash=hashlib.md5(bytes("chu"))
    hash.update(arg)
    return hash.hexdigest()

def register(user,pwd):

    with open("user.db","ab") as f:
        temp=user+"|"+func_md5(pwd)
        f.write(temp+"
")

def login(user,pwd):

    with open("user.db","rb") as f:

        for i in f.readlines():
            #print(i,i.split(),i.split("|"))
            a,b=i.strip().split("|")
            if a==user and b==func_md5(pwd):
                return 1
            else:
                return 0



def func():
    temp=input("1、登录；2、注册")
    if temp==1:
        username = raw_input("username:")
        password = raw_input("password:")
        ret=login(username,password)
        if ret ==1:
            print("登录成功")
        else:
            print("用户名密码不匹配")
    else:
        username = raw_input("username:")
        password = raw_input("password:")
        register(username,password)


func()