read and delete only one line of a file?

[zmaier]

Hello,

Code: Select all

with open(infile,'r') as ifile:
   for line in ifile:
      <do something with line>
      if everthing is iO
         delete line in file
      else   
	 leave line in file         	

How can i do that without using readlines and writelines (since the file is too big for the mem).

[jimmo]

Do you have room on flash to make a new file?

i.e. with your code above, write out he current line to the new file (if you're keeping the line).

Then at the end, replace the old file with the new one. (os.unlink, os.rename).

[zmaier]

Ok, thats a good workaround. I have enough room left, so this shouldn't be a problem.
I thought maybe there is a command which reads and deletes one line together.

THX