Python create file from list add empty line to the end

Question

I have to create the CVS file from the list, here is the code

data_list = ['1', '2' , '3', '4']
        with open("myfile.csv", "w", newline="") as output_file:
            for each_line in data_list:
                output_file.write(each_line + "\n")

I can understand "\n" breaks the line but when I open the file i see last line is EMPTY. this is how content looks like

1
2
3
4
  # empty line

Is there any way i can remove last empty line?

found the way to fix this.. but wanted to check if this is the right way

        data_list = ['1', '2' , '3', '4']
        with open( "mycvs.csv", "w") as output_file:
            counter = 0
            for each_line in data_list:
                if counter < len(data_list) -1:
                    output_file.write(each_line + "\n")
                else:
                    output_file.write(each_line)
                counter += 1

what's the last element of data_list?

timgeb
– timgeb

2021-12-20 20:04:34 +00:00
Commented Dec 20, 2021 at 20:04 — timgeb
– timgeb, Commented Dec 20, 2021 at 20:04
Don't include the /n at the end of the last line.

Scott Hunter
– Scott Hunter

2021-12-20 20:06:15 +00:00
Commented Dec 20, 2021 at 20:06 — Scott Hunter
– Scott Hunter, Commented Dec 20, 2021 at 20:06
@timgeb I updated my question

user1591156
– user1591156

2021-12-20 20:06:36 +00:00
Commented Dec 20, 2021 at 20:06 — user1591156
– user1591156, Commented Dec 20, 2021 at 20:06
keep it as is

timgeb
– timgeb

2021-12-20 20:07:53 +00:00
Commented Dec 20, 2021 at 20:07 — timgeb
– timgeb, Commented Dec 20, 2021 at 20:07
Shouldn't this be a backslash \ ?

Pedro Maia
– Pedro Maia

2021-12-20 20:07:59 +00:00
Commented Dec 20, 2021 at 20:07 — Pedro Maia
– Pedro Maia, Commented Dec 20, 2021 at 20:07

Horst Weber · Accepted Answer · 2021-12-20 20:15:03Z

2

Loop to the second last element of the list and do the last element without the "\n"

with open("myfile.csv", "w", newline="") as output_file:
    for each_line in data_list[:-1]:
        output_file.write(each_line + "\n")
    output_file.write(data_list[-1])

answered Dec 20, 2021 at 20:15

Horst Weber

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Comments

whiplash · Accepted Answer · 2021-12-20 20:11:19Z

0

You can try this:

with open("myfile.csv", "w") as output_file:
    length = len(data_list)
    for i in range(length-1):
        output_file.write(data_list[i]+"\n")
    output_file.write(data_list[length-1])

The output does not contain a new line in this case.

But as mentioned in this post, you shouldn't leave a file without a terminating \n in the last line.

answered Dec 20, 2021 at 20:11

whiplash

7255 silver badges24 bronze badges

1 Comment

whiplash Over a year ago

Thanks to @timgeb for linking me to that page.

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