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+--- Thread: Add a line after a specific line (/thread-12064.html)
Add a line after a specific line - morgandebray - Aug-07-2018
Hi, I'm trying to add new line after a particular line.
for line in file :
if line.startswith('/22/'):
#ADD LINE AFTER THIS line
#WITH "TEST" AS CONTENTbut file.write("TEST") add a line at the end of the fileI want the "TEST" line to be added after the "/22/" line
RE: Add a line after a specific line - buran - Aug-07-2018
you cannot insert it in the middle.
you need to create new/different file and write in it.
or read everything in the memory (incl. the new lines) and then overwrite the existing file.
RE: Add a line after a specific line - morgandebray - Aug-07-2018
This sounds complicated, no ?
I have to insert line in different place in the same file, I would need to create like 4 files to add 4 lines ?
RE: Add a line after a specific line - buran - Aug-07-2018
No, you need to create one extra file
input_file = 'input_file.txt' # '/path/to/inputfile.txt'
output_file = 'output_file.txt' # '/path/to/outputfile.txt'
with open(input_file) as in_file, open(output_file, 'w') as out_file:
for line in in_file:
out_file.write(line)
if line.strip() == '/##/':
out_file.write('TEST INSERT OF NEW LINE\n')