"Cut" big log file according to wanted dates?

[korenron]

ho do I do this?
like this?

with open("sample.txt", "r") as a_file:
  for line in a_file:
    stripped_line = line.strip()
    print(stripped_line)

then what ?
I retun to same problem no ?
what do I need to change in my thinking\seeing of the problem?
I think I'm missing something here
Thanks ,