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ast.main is not covered #101821

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ast.main is not covered#101821
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sobolevn
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testsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error
@sobolevn

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@sobolevn
sobolevn
opened on Feb 11, 2023

All this code is not covered:

cpython/Lib/ast.py

Lines 1712 to 1737 in b652d40

def main():
import argparse
parser = argparse.ArgumentParser(prog='python -m ast')
parser.add_argument('infile', type=argparse.FileType(mode='rb'), nargs='?',
default='-',
help='the file to parse; defaults to stdin')
parser.add_argument('-m', '--mode', default='exec',
choices=('exec', 'single', 'eval', 'func_type'),
help='specify what kind of code must be parsed')
parser.add_argument('--no-type-comments', default=True, action='store_false',
help="don't add information about type comments")
parser.add_argument('-a', '--include-attributes', action='store_true',
help='include attributes such as line numbers and '
'column offsets')
parser.add_argument('-i', '--indent', type=int, default=3,
help='indentation of nodes (number of spaces)')
args = parser.parse_args()
with args.infile as infile:
source = infile.read()
tree = parse(source, args.infile.name, args.mode, type_comments=args.no_type_comments)
print(dump(tree, include_attributes=args.include_attributes, indent=args.indent))
if __name__ == '__main__':
main()

Proof: https://github.com/python/cpython/blob/b652d40f1c88fcd8595cd401513f6b7f8e499471/Lib/test/test_ast.py

If I remove def main, tests still pass.

So, my proposal is: add a simple test case that ensures that ast.main is there. I don't think that we need any fancy stuff. ast.main is only a thin wrapper around ast.parse and ast.dump which are fully tested on their own.

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