[python-mode] Properly highlight lambda with no arguments

[rubyjoker]

BPO	1772721
Nosy	@warsaw, @birkenfeld, @amauryfa, @devdanzin
Files	lambda-with-no-arguments-highlighting.patch lambda-with-no-arguments-highlighting-2.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/warsaw'
closed_at = <Date 2010-10-21.13:02:28.726>
created_at = <Date 2007-08-12.19:05:44.000>
labels = ['type-feature']
title = '[python-mode] Properly highlight lambda with no arguments'
updated_at = <Date 2010-10-21.13:02:28.724>
user = 'https://bugs.python.org/rubyjoker'

bugs.python.org fields:

activity = <Date 2010-10-21.13:02:28.724>
actor = 'georg.brandl'
assignee = 'barry'
closed = True
closed_date = <Date 2010-10-21.13:02:28.726>
closer = 'georg.brandl'
components = ['Demos and Tools']
creation = <Date 2007-08-12.19:05:44.000>
creator = 'rubyjoker'
dependencies = []
files = ['8164', '13643']
hgrepos = []
issue_num = 1772721
keywords = ['patch']
message_count = 4.0
messages = ['53020', '85684', '85694', '119287']
nosy_count = 5.0
nosy_names = ['barry', 'georg.brandl', 'amaury.forgeotdarc', 'rubyjoker', 'ajaksu2']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'test needed'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue1772721'
versions = ['Python 2.7']

[rubyjoker]

Currently source highlighter in python-mode doesn't catch lambda forms without arguments, i.e. in:

function = lambda: 42

word "lambda" is not highlighted.

Attached patch fixes this issue by adding new rule to python-font-lock-keywords list. Patch against current trunk (r56963 now).

[devdanzin]

Many changes have landed in Misc/python-mode.el since rev 56963, can
anyone confirm the described behavior?

[amauryfa]

Yes, the behavior is the same with latest trunk.
I'd suggest this new patch though, it has the same effect but avoids a
new rule.

[birkenfeld]

python-mode.el is not maintained in Python anymore.