line replacement help

[mdalireza]

Hi,
I have wrote and trying to implement the code. I want to replace the whole lline containing anything like mov9, inp9 etc.

filename = 'myfile.txt'

with open(filename, 'r') as f:
  text = f.read()

text = text.replace('mov9=', 'mov9=this is')
text = text.replace('inp9=go', 'nom')
text = text.replace('nin9', 'ten9=pop')


with open(filename, 'w') as f:
  f.write(text)

when I run the code..I got the output like 'mov9=this is' first time. But second time I got like' mov9=this is this is'. I just want to replace the whole line containing move9 or inp9 everytime.

Please help me.

ichabod801 wrote Aug-15-2019, 05:50 PM:
Please use python and output tags when posting code and results. I put them in for you this time. Here are instructions for doing it yourself next time.

[ichabod801]

Go line by line:

filename = 'myfile.txt'
 
new_lines = []
with open(filename, 'r') as f:
  for line in f:
    if 'mov9=' in line:
      new_lines.append('mov9=this is')
    elif 'inp9=go' in line:
      new_lines.append('nom')
    elif 'nin9' in line:
      new_lines.append('ten9=pop')
    else:
      new_lines.append(line)
 
with open(filename, 'w') as f:
  f.write('\n'.join(lines))

[mdalireza]

Thanks.
I see f.write('\n'.join(lines))

When I compile lines is not found. Is this is 'new_lines'?

If I put the 'new_lines' then the file delete all.

[ThomasL]

filename = 'myfile.txt'
  
new_lines = []
with open(filename, 'r') as f:
  for line in f:
    if 'mov9=' in line:
      new_lines.append(line.replace('mov9=', 'mov9=this is'))
    elif 'inp9=go' in line:
      new_lines.append(line.replace('inp9=go', 'nom'))
    elif 'nin9' in line:
      new_lines.append(line.replace('nin9', 'ten9=pop'))
    else:
      new_lines.append(line)
  
with open('output.txt', 'w') as f:
  f.write('\n'.join(new_lines))

[ichabod801]

Yes, that should be new_lines. in the last line, not lines.

[mdalireza]

Thanks. One thing.

I just want to write in same myfile.txt file, not the output.txt file.

[snippsat]

(Aug-15-2019, 09:57 PM)mdalireza Wrote: I just want to write in same myfile.txt file, not the output.txt file.

There is fileinput in standard library or cleaner use in-place.

import in_place

filename = 'myfile.txt'
new_lines = []
with in_place.InPlace(filename) as f:
    for line in f:
        if 'mov9=' in line:
            new_lines.append(line.replace('mov9=', 'mov9=this is'))
        elif 'inp9=go' in line:
            new_lines.append(line.replace('inp9=go', 'nom'))
        elif 'nin9' in line:
            new_lines.append(line.replace('nin9', 'ten9=pop'))
        else:
            new_lines.append(line)
    f.write(''.join(new_lines) 

[ThomasL]

(Aug-15-2019, 09:57 PM)mdalireza Wrote: Thanks. One thing.

I just want to write in same myfile.txt file, not the output.txt file.

Then change the code to do so. What´s the problem in doing so?
I changed it to "output.txt" so that you have your original and the new file
and can compare it visually if the code is doing what you want.