python写入csv文件多一行

如执行下面的代码：

 1 import csv
 2 
 3 if __name__ == "__main__":
 4 
 5     content1 = ['hello']
 6     content2 = ['world']
 7 
 8     with open('test.csv', 'w') as f:
 9         writer = csv.writer(f)
10         writer.writerow(content1)
11         writer.writerow(content2)

打开test.csv文件查看，如下图：

 可以看到，多了一行空白行，解决方式如下：

如果使用的python3：

 1 import csv
 2 
 3 if __name__ == "__main__":
 4 
 5     content1 = ['hello']
 6     content2 = ['world']
 7 
 8     with open('test.csv', 'w', newline='', encoding='utf-8-sig') as f:
 9         writer = csv.writer(f)
10         writer.writerow(content1)
11         writer.writerow(content2)

如果使用的python2：

 1 import csv
 2 
 3 if __name__ == "__main__":
 4 
 5     content1 = ['hello']
 6     content2 = ['world']
 7 
 8     with open('test.csv', 'wb') as f:
 9         writer = csv.writer(f)
10         writer.writerow(content1)
11         writer.writerow(content2)