【python】写csv文件时遇到的错误

1.错误

在许多文件中，写入csv文件时都加"wb",w指写入，b指二进制

如：

csvwrite=csv.writer(open("output.csv","wb"))

Temp=["row1","row2","row3",]

csvwrite.writerow(Temp)

或者是

#!/usr/bin/env python
#coding:utf-8

import csv
#csv写数据
def writeCsv(file_name="C:\\Users\\Administrator\\Desktop\\test.csv"):
    with open(file_name,'wb') as f:
        writer=csv.writer(f)
        writer.writerow(['element','system'])
        data=[
        ('selenium','webdriver'),
        ('appium','android'),
        ('appium','ios'),
        ('selenium','python')]
        writer.writerows(data)
        f.close()

if __name__=='__main__':
    writeCsv()
    #print(getCsv(0,0))

运行结果都会出错：

TypeError: a bytes-like object is required, not 'str'

Traceback (most recent call last):
  File "E:\automatic\sc\data_driven_test\ddt_test.py", line 29, in <module>
    writeCsv()
  File "E:\automatic\sc\data_driven_test\ddt_test.py", line 9, in writeCsv
    writer.writerow(['element','system'])
TypeError: a bytes-like object is required, not 'str'
[Finished in 0.4s]

2.解决方法

写入时只添加“w”而不是“wb”

将上述代码改为：with open(file_name,'w') as f:

可执行通过，但是打开csv文件会发现每一行后面都会多一行空行

只需将代码改为 with open(file_name,'w',”newline='') as f: