每次仅在CSV文件中追加一行

Question

I use:

f = open("my_file.csv", "a")
writer = csv.writer(f)
writer.writerow(['one', 'two'])

But instead of appending a new row after the last row, it appends 2 new rows: an empty one and then the required one "one| two". What is the reason for that?

Answer 1

I find it easier to use with open() when writing to csv files. The documentation can be found here . I can reproduce the problem you had on my machine, but the following code does not produce an empty line after each new line is appended.

import csv

with open('my_file.csv', 'a', newline='') as csvfile:      
    writer = csv.writer(csvfile, delimiter=',')
    writer.writerow(['one', 'two'])