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From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Convert list to another form but providing same information
Date: Mon, 21 Mar 2016 14:14:23 -0600
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On Mon, Mar 21, 2016 at 2:12 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> On Mon, Mar 21, 2016 at 2:03 PM, Ben Bacarisse <ben.usenet@bsb.me.uk> wrote:
>> For experts here: why can't I write a lambda that has a statement in it
>> (actually I wanted two: lambda l, i: l[i] += 1; return l)?
>
> https://docs.python.org/3/faq/design.html#why-can-t-lambda-expressions-contain-statements

tl;dr: If you want a function with a statement in it, use def, not lambda.