python文件的写入write（）

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filename = 'pragramming.txt'

with open(filename,'w') as fileobject: #使用‘w’来提醒python用写入的方式打开
    fileobject.write('I love your name!'
                     '\nI love your cloth!'
                     '\nI love your shoes!'
                     '\nI love your hair!')

with open(filename,'a') as fileobject: #使用‘a’来提醒python用附加模式的方式打开
    fileobject.write('\nI an superman.')

代码中的filename如果没有这个文件，python会自己新建一个。

json文件的写入和读取：

import json

filename = 'number.json'
def write_json():
    numbers = [1,2,3,4,5,6,7,8,9,10]
    with open(filename,'w') as fp:
        json.dump(numbers,fp)#写入json文件
write_json()

def read_json():
    with open(filename) as pf:
        numbers = json.load(pf)#读取json文件
        print(numbers)
read_json()

训练：

import json
def remember_me():
    active = True
    while active:
        for i in range(5):
            if i < 4:
                username = input('Please enter your name:')
                filename = 'name.json'
                with open(filename,'w') as fp:#以w的方式打开写入时会覆盖原有记录，而以a打开不会
                    json.dump(username,fp)
                    print('Hello! '+username.title())
            else:
                active = False
remember_me()