python--小确幸

#把手机号中间四位隐藏
def change_number(number):
    hiding_number=number.replace(number[3:7],'*'*4)
    print(hiding_number)
number=input('请输入电话号码:')
hid_number=change_number(number)

#输入密码，判断是否正确
def count_login():
    password=input('password:')
    if password=='':
        print('succeed!!')
    else:
        print('password wrong!')
        count_login()
count_login()

#输入密码，判断是否正确，输错三次就在等一小时
global num#全局变量要先声明再使用
num=0
def count_login():
    global num#全局变量在函数中用到时要再次声明
    password=input('password:')
    if password==(''):
        print('succeed!!')
    else:
        print('password wrong!')
        num=num+1
        if num==3:
            print('Please try again 1 hour later!')
        else:
            count_login()
count_login()

#用循环实现：输入密码判断是否正确，若错误3次就再等1小时
i=0
while i<3:
    password=input('passward:')
    if password==(''):
        print('Succeed!!')
        exit(0)
    else:
        i=i+1
        print('Password wrong!')
print('Please try again 1 hour later!')

#文件打开和编辑文件内容
f = open('C:/Users/Ma Yiling/Desktop/code/Cola.txt', 'w') #清空文件内容再写
f.write('aaa') #只能写字符串
f.write('\n')
f.writelines(['', 'bbb']) #可写所有能迭代的类型，例如list
f.writelines(('','\n', 'ccc')) #例如tuple
f.close()