python读写txt、csv、json

先写这些，有时间再加。

import csv

''' Description：文件读写工具 Author：西兰 Date：2019-11-30 '''
class util(object):

    ''' 以追加形式写入txt文件，带换行 '''
    def write_to_txt(self,filename, line):
        with open(filename, 'a', encoding='utf-8') as f:
            f.write(line +'\n')


    ''' 读取txt文档，适合文本内容较小的文档 读取结果存入list，内存占用较大 :return list '''
    def read_txt(self,filename):
        with open(filename, 'r', encoding='utf-8') as f:
            list = f.readlines()
        return list
    ''' 读取txt文档，适合文本内容较大的文本，内容占用较小 '''
    def read_txt_with_small_cache(self, filename):
        with open(filename, 'r', encoding='utf-8')as f:
            line = f.readline()
            while(line):
                print(line)
                line = f.readline()
    ''' 写入csv，追加形式 row_data是列表形式 '''
    def write_to_csv(self,filename,row_data):
        with open(filename, 'a+', newline="", encoding='utf-8') as f:
            csv_add = csv.writer(f)
            csv_add.writerow(row_data)
    ''' 读取csv '''
    def read_csv(self,filename):
        with open(filename, newline='', encoding='UTF-8') as f:
            rows = csv.reader(f)
            for row in rows:
                print(''.join(row))

##python读写json：

import json

''' 将数据保存为json格式 1、python3里面默认编码是unicode 2、做dump与dumps操作时，会默认将中文转换为unicode，但在做逆向操作load和loads时会转换为中文， 但是中间态(例如存储的json文件)的中文编码方式仍然是unicode 解决办法： 在dump里面添加ensure_ascii=False '''

dict = {}
data_dict = {}
dict['token'] = 'md5(gateguard+服务器IP)'
list = []
list.append(data_dict)
dict['data'] = list
data_dict['name'] = '张三'
data_dict['age'] = '24'
data_dict['address'] = '上海市松江区'
#写入json
with open('./data.json', mode='w', encoding='utf-8') as f:
      f.write(json.dumps(dict, ensure_ascii=False, indent=2))

#读取json
with open('./data.json', mode='r', encoding='utf-8') as f2:
      print(json.load(f2))


写入后的结果：
{
  "token": "md5(gateguard+服务器IP)",
  "data": [
    {
      "name": "张三",
      "age": "24",
      "address": "上海市松江区"
    }
  ]
}

上海今天下起了小雨，呜啦啦~