Python读写本地文件

func、arguments

• open() 函数

r : 读文本
rb : 读二进制
w : 写文本
wb : 写二进制
a : 追加文本
ab : 追加二进制
r+ : 可读写，文件不存在会报错
w+ : 可读写，文件不存在自动创建
a+ : 可追加可写，文件不存在自动创建
rb+ wb+ ab+ : 同理

• read() 函数

readline() : 每次读一行
readlines() : 针对列表

• write() 函数

writeline()
writelines() : 针对列表

• close() 函数

不可或缺

Code

• 读

file = open('allMsg.json', 'r')
try:
    print(file.read())
finally:
    file.close()

• 写

file = open('allMsg.json', 'w')
try:
    file.write('123')
finally:
    file.close()

• with 语句自动调用 close()

with open('allMsg.json','r') as file:
    print(file.read())

with open('allMsg.json','w') as file:
    file.write('123')

Demo

import random
import json

file = open('allMsg.json', 'w')

ary = []
nameAry = ['孙左','孙纯山','钱海','冯春','陈美','陈秋兵','孙江潮','陈帅奎','蒋有','赵冬华','冯海强','冯应强','蒋江垂','冯超','陈湖华',
           '冯有','端木纯兵','端木超刚','蒋海华','孙上工','楚左','杨大','钱海超','冯纯']
messageAry = ["二龙湖浩哥：什么事？🐂🐂🐂🐂",
              "微风：麻蛋！！！",
              "夜在哭泣：好好地，🐂别瞎胡闹",
              "我不帅：坑死我了。有木有人儿。",
              "hello world：🐂🐂🐂我不懂",
              "大脸猫：这。。。。。。酸爽~ http://www.cocoachina.com",
              "你似不似傻：呵呵🐎🐎🐎🐎🐎🐎",
              "天天向上：辛苦了！",
              "不爱掏粪男孩：新年快乐！猴年大吉！摸摸哒 http://www.cocoachina.com",
              "最爱欧巴：[呲牙][呲牙][呲牙]",
              "大长腿思密达：[图片]",
              "别给我晒脸：坑死我了。。。。。",
              "可爱男孩：你谁？？？🐎🐎🐎🐎",
              "筷子姐妹：和尚。。尼姑。。",
              "法海你不懂爱：春晚太难看啦，妈蛋的🐎🐎🐎🐎🐎🐎🐎🐎",
              "长城长：好好好~~~",
              "老北京麻辣烫：约起 http://www.cocoachina.com",
              "我不搞笑：寒假过得真快",
              "原来我不帅：有木有人儿？",
              "亲亲我的宝贝：你🐎说🐎啥🐎呢",
              "请叫我吴彦祖：好搞笑🐎🐎🐎，下次还来",
              "帅锅莱昂纳多：我不理解 http://www.cocoachina.com",
              "星星之火：脱掉，脱掉，统统脱掉🐎",
              "雅蠛蝶~雅蠛蝶：好脏，好污，好喜欢"
            ]
for num in range(0,24):
    dict = {}
    dict['imageName'] = random.randrange(0,24)
    dict['name'] = nameAry[random.randrange(0, 24)]
    dict['message'] = messageAry[random.randrange(0, 24)]
    ary.append(dict)

try:
    file.write(json.dumps(ary))
finally:
    file.close()