python 自学day2 对文件的增删查

代码

import json
def search(file,str1,str2=''):
    count = 0
    k = 0
    with open(file,'r+',encoding='utf-8') as f1:
        for i in f1:
            count +=1
            if str1 in i:
                k = count+1
                print(i)
            if count == k:
                k += 1
                if str2 not in i :
                    print(i)
                else:
                    k -= 1
def add(file,**arg):
    p = json.dumps(arg)
    with open(file,'a',encoding='utf-8') as f1:
        f1.write(p)
def delete(file,file1,str1):
    with open(file,'r+',encoding='utf-8') as f1,\
        open(file1, 'r+',encoding='utf-8') as f2:
        for i in f1:
            if str1 in i:
                continue
            f2.write(i)