FAQ: Learn Python: Files - Iterating Through Lines


This community-built FAQ covers the “Iterating Through Lines” exercise from the lesson “Learn Python: Files”.

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This exercise can be found in the following Codecademy content:

Learn Python 3

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what is the different from these command…?

with open("how_many_lines.txt") as lines_doc:
  for line in lines_doc.readlines():


with open("how_many_lines.txt") as lines_doc:
  for line in lines_doc:

both of them have same output:

1. How many lines do we write on the daily,

2. Many money, we write many many many

3. How many lines do you write on the daily,

4. Say you say many money, you write many many many

i mean, what’s actually function from .readlines() if without it, still produce same output…?

thanks …

1 Like

I too would like to know.


If you are working with a lengthy text (millions of lines, perhaps), you might not want to upload and insert into memory a list of every line, as you would using the file.readlines() approach. for line in file:, on the other hand, loads and works with only one line at a time.