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bpo-40926: Improve & fix command line usage of symtable #20757

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bpo-40926: Improve & fix command line usage of symtable #20757

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30 changes: 23 additions & 7 deletions Lib/symtable.py
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Original file line number Diff line number Diff line change
Expand Up @@ -233,11 +233,27 @@ def get_namespace(self):
raise ValueError("name is bound to multiple namespaces")
return self.__namespaces[0]

if __name__ == "__main__":
import os, sys
with open(sys.argv[0]) as f:
src = f.read()
mod = symtable(src, os.path.split(sys.argv[0])[1], "exec")
def main():
from argparse import ArgumentParser, FileType
parser = ArgumentParser(prog='python -m symtable')
parser.add_argument('infile', type=FileType(mode='rb'), nargs='?',
default='-',
help='the file to show symbol table; defaults to stdin')
parser.add_argument('-m', '--mode', default='exec',
choices=('exec', 'single', 'eval'),
help='specify what kind of code must be parsed')
args = parser.parse_args()

with args.infile as infile:
source = infile.read()

mod = symtable(source, args.infile.name, args.mode)
available_properties = [prop for prop in dir(Symbol) if prop.startswith("is_")]

for ident in mod.get_identifiers():
info = mod.lookup(ident)
print(info, info.is_local(), info.is_namespace())
symbol = mod.lookup(ident)
properties = {prop.removeprefix("is_") for prop in available_properties if getattr(symbol, prop)()}
print(symbol, "==>", properties)

if __name__ == "__main__":
main()
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-06-09-13-20-46.bpo-40926.iu-NHn.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix command line interface of :mod:`symtable`.