[Python-ideas] frozenset literals

[Stefan Behnel]

Hua Lu, 02.02.2013 08:38:
> >>> import ast
> >>> ast.literal_eval("{ 'key': 'val' }")
> {'key': 'val'}
> >>> ast.literal_eval("{ ('key',): 'val' }")
> {('key',): 'val'}
> >>> ast.literal_eval("{ frozenset({'key'}): 'val' }")
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python3.3/ast.py", line 86, in literal_eval
>     return _convert(node_or_string)
>   File "/usr/lib/python3.3/ast.py", line 63, in _convert
>     in zip(node.keys, node.values))
>   File "/usr/lib/python3.3/ast.py", line 62, in <genexpr>
>     return dict((_convert(k), _convert(v)) for k, v
>   File "/usr/lib/python3.3/ast.py", line 85, in _convert
>     raise ValueError('malformed node or string: ' + repr(node))
> ValueError: malformed node or string: <_ast.Call object at 0x7f865a8c1450>

So, why exactly are you using ast.literal_eval() to evaluate a non-literal
expression?

Stefan

PS: please reply without top-posting.