python生成以及打开json、csv和txt文件的实例

生成txt文件：

mesg = "hello world"

with open("test.txt", "w") as f:
f.write("{}".format(mesg))
print("加载完成！")

生成json文件：

import json

mesg = {"key": "value"}

with open("test.json", "w") as f:
json.dump(mesg, f)
print("加载完成！")

生成csv文件：

import csv

with open("test.csv", "w") as f:
fieldnames = ["name", "age"] # 表的列名
writer = csv.DictWriter(f, fieldnames=fieldnames)

writer.writeheader() # 加上表头
writer.writerow({"name": "shannon-li", "age": 4}) # 按行添加
print("加载完成！")

打开txt文件：

with open("test.txt") as f:
content = f.read()
print("文件内容：{}".format(content))

打开json文件：

import json
import sys

with open("test.json") as f:
try:
 content = json.load(f)
 print("文件内容：{}".format(content))
except TypeError:
 sys.exit("Error on load json file.")

打开csv文件：

import csv
import sys

content = []

with open("test.csv") as f:
reader = csv.DictReader(f, delimiter=",", quotechar="|")

try:
 for row in reader:
  content.append({"name": row["name"], "age": row["age"]})
 print("文件内容：".format(content))
except csv.Error as e:
 sys.exit("file ％s, line ％d: ％s" ％ (f, reader.line_num, e))

来源：https://blog.csdn.net/weixin_42555131/article/details/82012642