2 ms·

Ambigious does not mean invalid

• chubot 3y ago
  Yes, technically it means "there's more than one derivation" But Python's pgen rejects such grammars as invalid ... The other strategy is just to pick an arbitrary interpretation
• hinkley 3y ago
  For people who see parsing as model checking, ambiguity means something vastly different (inferior) to leniency. Fast parsers that use a schema are also doing model checking.