How to skip first two lines and last one line in python

Question

I have string value:

    str1 = """
          first line
          second line
          abc
          def
          xyz
          123
          lastline"""

How to skip first two lines and last line and print remaining lines.

Code: I tried and works for to skip first two lines

for index, line in enumerate(str1.split("\n")):
    if index <= 1:
        continue
    print line

Output getting from above code:

          abc
          def
          xyz
          123
          lastline

Expected output:

`(if index <= 1) or (index >= len(str.split("\n")) - 1)`? Or better yet, precompute the number of lines and store it as a variable. — pault, Apr 09 '18 at 18:39
Related: [understanding python's slice notation](https://stackoverflow.com/questions/509211/understanding-pythons-slice-notation) — pault, Apr 09 '18 at 18:41
Possible duplicate of [Understanding Python's slice notation](https://stackoverflow.com/questions/509211/understanding-pythons-slice-notation) — David Zemens, Apr 09 '18 at 18:41
https://docs.python.org/2.7/library/stdtypes.html#str.splitlines exists — , Apr 09 '18 at 18:46
Your're actually skipping the first three lines (the top line just has a newline. — Brendan Abel, Apr 09 '18 at 18:47

score 2 · Accepted Answer · 2018-04-09T18:43:21.980

2

>>> str1.splitlines()[3:-1]
['          abc', '          def', '          xyz', '          123']

Note that the first line (index 0) is empty. It is terminated by the first \n directly after the opening double quotes.

edited Apr 09 '18 at 18:43

answered Apr 09 '18 at 18:41

1

I think that should be `[2:-1]`. – John Gordon Apr 09 '18 at 18:43
Actually it is `[3:-1]` because of the leading `\n`. – Apr 09 '18 at 18:44
I am end up with using [3: -2] because I have last line is empty line. Shall i use filter to remove empty lines from the list? – Sagar Apr 09 '18 at 18:57
That depends on your requirements. If you know the number of lines, even the empty ones, the slice approach should work fine. But if you want to remove empty lines somewhere in the file, filter them. – Apr 09 '18 at 18:59

1 Answers1