python csv写 不换行 python写csv有空行

默认在open（‘data.csv’,'w+'）模式下会有空行。在open后面添加newline=‘’ 即可解决。

https://stackoverflow.com/questions/41045510/pandas-read-csv-ignore-rows-after-a-blank-line

with open("data_a.csv","w",newline='') as csvfile:
    fieldnames = ["id","title"]
    writer=csv.DictWriter(csvfile,fieldnames=fieldnames)
    writer.writeheader()
    writer.writerow({"id":123,"title":"New title"})
    writer.writerow({"id":345,"title":"test "})