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From: Peter Otten <__peter__@web.de>
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Subject: Re: Conditionals in Python cli with -m oneliner
Date: Sun, 10 Apr 2016 00:15:53 +0200
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Xref: csiph.com comp.lang.python:106770

gvim wrote:

> Given that this work in a Python 3 repl:
> 
>>>> import re
>>>> txt = "Some random text"
>>>> if re.search(r"\b\w{4}\b", txt): txt
>>>> 'Some random text'
> 
> .... and this works on the command line, printing all lines in logs.txt:
> 
> $ python3 -m oneliner -ne 'line' logs.txt
> 
> ..... why does this fail:
> 
> $ python3 -m oneliner -m re -ne 'if re.search(r"\b\w{4}\b", line): line'
> logs.txt
> syntax error in: if re.search(r"\b\w{4}\b", line): line

You seem o be talking about https://pypi.python.org/pypi/oneliner

$ python3 -m oneliner --help
Usage: python -m oneliner [-hvnpdijl] [-m mod] [-e expr] [-s stmt] <path> [<path> ...]

[snip]

  -e expr  python expression (see Execution Model)
  -s stmt  python statement (see Execution Model)

So you can either use -e with an expression

$ python3 -m oneliner -m re -ne 'line if re.search(r"\b\w{4}\b", line) else ""'

or -s with a statement

$ python3 -m oneliner -m re -ns 'if re.search(r"\b\w{4}\b", line): print(line, end="")'