Add real excpetion for SyntaxEorrr in mapping file

Chosson Ulysserequested to merge
FIX_better_exception_python_syntax_error_mapping into NEW_version_1_3

Added

  • Add a try, except for eval if we find a SyntaxError in mapping.
  • Add a new exception: MappingError.
  • Add a new exception: PythonSyntaxError.

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