Using readlines() to write a template txt file to 'x' new files

Question

I have a template txt file. This template needs to be written as 10 new files where I can then make amendments to each file based on certain conditions (not relevant to the question).

I read my template file as follows:

with open('template.txt', 'r') as template_file:
     file_lines = template_file.readlines()
     file_lines = [line.rstrip('\n') for line in file_lines]
     for i in range(10):
         new_file = open('output_%s' % i, 'w')
         new_file.write(file_lines)
     new_file.close()

It won't work as I cannot write a list to each file, it must be a string, but I don't know how to get every element from that list to be written in the same file 10 times...Each time I try it a different way I end up getting each line on different files, rather than all lines in all files.

Something wrong in my logic I cannot work out.

Another way I can do it as :

template_file = open('template.txt', 'r')
template_lines = template_file.read()

for i in range(10):
    new_files = open('output_%s' % i, 'w')
    new_files.write(template_lines)

But I want to be able amendment particular lines which makes it more convenient to write into each new file line by line (via readlines())

Answer 1

You can use the python method writelines(<iterable>) on the fileobject.

Something like:

with open('template.txt', 'r') as template_file:
    file_lines = template_file.readlines()
    file_lines = [line.rstrip('\n') for line in file_lines]
    for i in range(10):
        with open('output_%s' % i, 'w') as new_file:
            new_file.write_lines(file_lines)

Also not sure you need the rstrip('\\n') as readlines() already should be removing newlines.

Answer 2

尝试缩进new_file.close()以便在每个for循环之后将其保存

Answer 3

I don't fully understand what you want to achieve. Anyways, here is a code snippet of how you can write the same line to every one of the 10 files:

with open('template.txt', 'r') as template_file:
    file_lines = template_file.readlines()
    file_lines = [line.rstrip('\n') for line in file_lines]
    for line in file_lines:
        for i in range(10):
            new_file = open('output_%s' % i, 'a') # appending content
            new_file.write(line)
            new_file.close()

or even this, if you prefer:

with open('template.txt', 'r') as template_file:
    file_lines = template_file.readlines()
    file_lines = [line.rstrip('\n') for line in file_lines]
    for i in range(10):
        new_file = open('output_%s' % i, 'w')
        for line in file_lines:
            new_file.write(line)
        new_file.close()

Answer 4

The writelines method did the job.

with open(TRANSFER_SKED, 'r') as template_file:
    file_lines = template_file.readlines()
    # file_lines = [i.rstrip('\n') for i in file_lines]

    for i in range(10):
        with open('output_%s.txt' % i, 'w') as new_file:
            new_file.writelines(file_lines)