linux-kernel - Re: [PATCH v2] perf scripts python: Add Python 3 support to failed-syscalls-by-pid.py

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Date:   Fri, 18 Jan 2019 18:37:34 -0800
From:   Tony Jones <tonyj@...e.de>
To:     Seeteena Thoufeek <s1seetee@...ux.vnet.ibm.com>,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf scripts python: Add Python 3 support to
 failed-syscalls-by-pid.py

On 1/18/19 5:12 PM, Tony Jones wrote:
> On 1/17/19 1:45 AM, Seeteena Thoufeek wrote:
> 
>> +from __future__ import print_function
> 
> You don't need this unless you're actually requiring functionality that only exists in v3.
> For example, you need it to handle the suppress newline functionality such as "end=".

Also, it brings up a question I had.   What python versions are expected to be supported with PYTHON=python2?

https://python-future.org/imports.html   So importing from future (for end='' support) implies >= 2.6.   

The base release of 2.6 was October 2008 so maybe this is fine.  Otherwise it may be preferable to use sys.stdout.write which has more consistent semantics (see
tools/perf/scripts/python/compaction-times.py)

Tony