写csv文件时遇到的错误

Posted 2020-11-05 dhs94

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: