lib2to3 provide a way to use exec as a function in RefactoringTool

[isidentical]

BPO	39313
Nosy	@benjaminp, @pablogsal, @miss-islington, @isidentical
PRs	bpo-39313: Add an option to RefactoringTool for using exec as a function #17967

^{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 2020-01-12.22:24:33.403>
created_at = <Date 2020-01-12.15:15:27.401>
labels = ['expert-2to3', '3.9']
title = 'lib2to3 provide a way to use exec as a function in RefactoringTool'
updated_at = <Date 2020-01-12.22:24:33.402>
user = 'https://github.com/isidentical'

bugs.python.org fields:

activity = <Date 2020-01-12.22:24:33.402>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-12.22:24:33.403>
closer = 'pablogsal'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2020-01-12.15:15:27.401>
creator = 'BTaskaya'
dependencies = []
files = []
hgrepos = []
issue_num = 39313
keywords = ['patch']
message_count = 3.0
messages = ['359853', '359873', '359879']
nosy_count = 4.0
nosy_names = ['benjamin.peterson', 'pablogsal', 'miss-islington', 'BTaskaya']
pr_nums = ['17967']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39313'
versions = ['Python 3.9']

[isidentical]

bpo-23896 introduced a grammar without print and exec statements (they both are functions now) but both the lib2to3 cli script and RefactoringTool lacks of that functionality (which is pretty useful for outside users of lib2to3 like formatters)

(RefactoringTool)
if self.options["print_function"]:
self.grammar = pygram.python_grammar_no_print_statement
else:
self.grammar = pygram.python_grammar

It should be supported here and on the command line script.

[isidentical]

After discussing with @pablogsal, instead of offering 2 options that one overlaps another we added -e option to 2to3.main and exec_function option (alongside print_funtion) to RefactoringTool.

[miss-islington]

New changeset 61b1415 by Miss Islington (bot) (Batuhan Taşkaya) in branch 'master':
bpo-39313: Add an option to RefactoringTool for using exec as a function (GH-17967)
61b1415