Python學習——使用json模塊存儲數據
阿新 • • 發佈:2018-06-29
style else put spa IT 可用 json found eight
JSON( Javascript Object )格式
json.dump( )兩個實參:1. 要存儲的數據 2.可用於存儲數據的文件對象
如 with open(filename, ‘w‘) as f_obj:
json.dump(numbers, f_obj)
json.load( )加載文件中的信息,1個實參:要讀取信息的文件對象
練習:使用json存儲和讀取用戶信息
import json
def get_stored_username():
filename = ‘username.json‘
try:
with open(filename) as f_obj:
username = json.load(f_obj)
except FileNotFoundError:
return None
else:
return username
def get_new_username():
username = input("What is your name? ")
filename = ‘username.json‘
with open(filename, ‘w‘) as f_obj:
json.dump(username, f_obj)
return username
def greet_user():
username = get_stored_username()
if username:
print("Welcome back, " + username + "!")
else:
username = get_new_username()
print("We will remember you when you come back, " + username + "!")
greet_user()
Python學習——使用json模塊存儲數據