将字符串转换为文本文件时添加行

Question

Python

I have 1000+ files with numerically consecutive names like IMAG0000.JPG that I have saved as list, converted to string, and saved as a text file. I want the text file to look like this:

IMAG0000.JPG
IMAG0001.JPG
IMAG0002.JPG
IMAG0003.JPG
...

Currently, it looks like:

IMAG0000.JPGIMAG0001.JPGIMAG0002.JPGIMAG0003.JPG...

I can't quite figure out where to put \\n to make it format correctly. This is what I have so far...

import glob

newfiles=[]
filenames=glob.glob('*.JPG')
newfiles =''.join(filenames)

f=open('file.txt','w')
f.write(newfiles)

Answer 1

You concat with an empty string '' instead of '\\n' .

newfiles = '\n'.join(filenames)
f = open('file.txt','w')
f.write(newfiles) # keep in mind to use f.close()

or safer (ie releasing the file handle):

with open("file.txt", w) as f:
    f.write('\n'.join(filenames))

or instead of concatting everything:

with open("file.txt", w) as f:
    for filename in filenames:
        f.write(filename + '\n')

Answer 2

Try this:

newfiles = '\n'.join(filenames)

Side note: it's good practice to use the with keyword when dealing with file objects, so the code:

f=open('file.txt','w')
f.write(newfiles)

would become:

with open('file.txt','w') as f:
    f.write(newfiles)

That way you do not need to explicitly do f.close() to close the file.