Remove specific lines from a large text file in python

Question

I have several large text text files that all have the same structure and I want to delete the first 3 lines and then remove illegal characters from the 4th line. I don\'t w

Answer 1

Just try it for each file. 100 MB per file is not that big, and as you can see, the code to just make an attempt is not time-consuming to write.

with open('file.txt') as f:
  lines = f.readlines()
lines[:] = lines[3:]
lines[0] = lines[0].replace('Rx(db)', 'Rx')
lines[0] = lines[0].replace('Best Unit', 'Best_Unit')
with open('output.txt', 'w') as f:
  f.write('\n'.join(lines))