Make python -m ast more configurable

[isidentical]

BPO	38348
Nosy	@vstinner, @serhiy-storchaka, @ilevkivskyi, @isidentical
PRs	bpo-38348: Extend options of ast tool #16540

^{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 = None
closed_at = <Date 2019-12-16.18:24:07.550>
created_at = <Date 2019-10-02.15:14:59.536>
labels = ['library', '3.9']
title = 'Make python -m ast more configurable'
updated_at = <Date 2019-12-16.18:24:07.549>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2019-12-16.18:24:07.549>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-12-16.18:24:07.550>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2019-10-02.15:14:59.536>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 38348
keywords = ['patch']
message_count = 8.0
messages = ['353741', '353830', '353842', '353972', '353990', '354414', '358502', '358503']
nosy_count = 4.0
nosy_names = ['vstinner', 'serhiy.storchaka', 'levkivskyi', 'BTaskaya']
pr_nums = ['16540']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38348'
versions = ['Python 3.9']

[isidentical]

Allow user to set indent level and parsing status of type comments

[serhiy-storchaka]

Why do you need this feature?

[isidentical]

I was checking typed_ast and i wanted to know which parts changed and
implement that parts to astor. But there was no flags for --type-comments
False.

Also it can be handy to have an indention option to change it for fitting
tree into the terminal width.

On Thu, Oct 3, 2019, 11:45 AM Serhiy Storchaka <report@bugs.python.org>
wrote:

Serhiy Storchaka <storchaka+cpython@gmail.com> added the comment:

Why do you need this feature?

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue38348\>

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[serhiy-storchaka]

Sorry, I do not understand you. typed_ast does not have such features as multiline dump() and CLI. What relation is this have with the --type-comments flag?

As for fitting tree into the terminal width, the current indentation is 3 spaces. Changing it to 2 spaces will not save much horisontal space, and 1-space indentation is not particularly readable.

I do not want to complicate this tiny feature. If you want more control on the output, you can write a small Python script which calls ast.dump() programmatically.

[isidentical]

I do not want to complicate this tiny feature.
Making more configurable isn't making it complicated. It is just improving users control over it by indentation and parsing option.

[ilevkivskyi]

I don't have any strong opinion either way, so it looks like we need to wait until someone else will ask for this.

[vstinner]

New changeset 814d687 by Victor Stinner (Batuhan Taşkaya) in branch 'master':
bpo-38348: Extend command line options of ast parsing tool (GH-16540)
814d687

[vstinner]

Thanks Batuhan Taşkaya.