import sys import time # print(sys.argv)#命令行参数，第一个是路径 # print(sys.path) # # if sys.argv[1] == "1": # #     print(1) # # choice = input("wanna quit?") # # if choice == "y" or choice == "Y": # #     exit("goodbye")#退出 # #     sys.exit()#等同 # print(sys.version)#获取python版本 # print(sys.platform)#返回操作系统名称 # for i in range(101): #     sys.stdout.write("\r")  # 每一次清空原行 #     sys.stdout.write("%s%% | %s" % (int(i), int(i)*"#")) #     sys.stdout.flush()  # 强制刷新到屏幕 #     #print(str(i)+"%") #     time.sleep(0.05) accounts = {
      1000:{
          "name":"tom",         "email":"mm.cc",         "passwd":"123",         "balance":12000,         "phone":"133415",         "bank_acc":{
              "abcc":441         }     },     1001:{
          "name":"jim",         "email":"dmm.cc",         "passwd":"1234",         "balance":10000,         "phone":"1233415",         "bank_acc":{
              "abcc":554         }     } } import pickle with open("h1.txt","wb") as f:     f.write(pickle.dumps(accounts)) with open("h1.txt","rb") as f2:     dic = pickle.loads(f2.read())     dic[1000]["balance"] -= 2000 with open("h1.txt", "wb") as f:     f.write(pickle.dumps(dic)) with open("h1.txt", "rb") as f2:     print(pickle.loads(f2.read()))

####等于上面 # with open("h1.txt","wb") as f: #     pickle.dump(accounts,f) # with open("h1.txt","rb") as f2: #     dic = pickle.load(f2) #     dic[1000]["balance"] -= 2000 # with open("h1.txt", "wb") as f: #     pickle.dump(dic,f) # with open("h1.txt", "rb") as f2: #     print(pickle.load(f2)) #### #import json #json 用法同pickle，json局限但通用

#json.loads()用于将字典、列表、元组等形式的字符串，转换成相应的字典、列表、元组 #loads字符串必须里面都是双引号，例如:'{"n1":1}'

# with open("h1.txt","w") as f: #     f.write(json.dumps(accounts)) # with open("h1.txt","r") as f2: #     dic = json.load(f2) #     dic["1000"]["balance"] -= 3000 # with open("h1.txt", "w") as f: #     json.dump(dic,f) # with open("h1.txt", "rb") as f2: #     print(json.load(f2))