函数

# 1、编写文件修改功能，调用函数时，传入三个参数（修改的文件路径，要修改的内容，修改后的内容）既可完成文件的修改

import os
def change(dir,before,after):
    with open(dir,'r+',encoding='utf-8') as f,\
         open('{}.swap'.format(dir),'w',encoding='utf-8') as w:
        for i in f:
            # print(i)
            i=i.replace(before,after)
            w.write(i)
    os.remove(dir)
    os.rename('{}.swap'.format(dir),dir)

# change('test.log','a','噢噢噢噢')

# 2、编写tail工具

def tail(func):
    with open(func,'r',encoding='utf-8') as f:
        data=f.readlines()[-10:]
        for i in data:
            print(i)
# tail('test.log')

# 1、充值功能：用户输入充值钱数，db.txt中该账号钱数完成修改

import os
def recharge(inp_name):
    charge=int(input('>>>>>>>请输入充值输入: '))
    with open('db.txt','r+',encoding='utf-8') as f,\
         open('db.txt.swap','a+',encoding='utf-8') as w :
        for i in f:
            # data=i.strip('\n').split(':')
            name=i.strip('\n').split(':')[0]
            #password=i.strip('\n').split(':')[1]
            money=int(i.strip('\n').split(':')[2])
            if name == inp_name :
                new_money = money + charge
                print(money)
                print(new_money)
                a=i.replace(str(money),str(new_money))
                w.write(a)
            else:
                w.write(i)
                # data[2] = money
                # print(data)
                # f.write('{}:{}:{}\n'.format(data[0],data[1],data[2]))
    os.remove('db.txt')
    os.rename('db.txt.swap','db.txt')