Python csv library reads and writes files

Preface

I remembered that when I used the pandas library function read_excel to read excel, I remembered that another function was read_csv. I thought about using csv or pandas, but I was actually bypassed tonight. I took advantage of this opportunity to learn about the python built-in csv module.
Portal: official document

Read file

The test.csv file is as follows:

序号,参数
1,3
2,6
3,7

import csv

with open("test.csv",'r') as csvfile:
	files = csv.reader(csvfile)
	for file in files:
		print(file)

result:

['序号', '参数']
['1', '3']
['2', '6']
['3', '7']

Write file

import csv

with open('names.csv', 'w', newline='') as csvfile:
    fieldnames = ['first_name', 'last_name']
    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)

    writer.writeheader()	# 书写表头
    writer.writerow({
    
    'first_name': 'Baked', 'last_name': 'Beans'})
    writer.writerow({
    
    'first_name': 'Lovely', 'last_name': 'Spam'})

names.csv content:

first_name,last_name
Baked,Beans
Lovely,Spam

Writing while reading

So far, I have not seen the operation of reading and writing. As far as the programming language is used to operate the same file, it is not recommended to read and write. Because the uncertainty is too strong, it is recommended to use other files to cover.

postscript

More details about the csv library can be found in the portal . Of course, the lesson is that of 对于某些技术点不熟悉，第一应该是查看官方文档，而不是漫无目的地在网络上寻找适配。course, the online technology is indeed rich, but the best is true.