[Python-bugs-list] [Bug #115126] Over restricted type checking on eval() function

[noreply@sourceforge.net]

Bug #115126, was updated on 2000-Sep-22 12:36
Here is a current snapshot of the bug.

Project: Python
Category: Core
Status: Open
Resolution: None
Bug Group: Feature Request
Priority: 5
Summary: Over restricted type checking on eval() function

Details: The built-in function eval() takes a string argument and a dictionary.  The second argument should allow any instance which defines __getitem__ as opposed to just dictionaries.

The following example creates a type error:
  eval, argument 2: expected dictionary,   instance found

class SpreadSheet:
    _cells = {}
    def __setitem__( self, key, formula ):
        self._cells[key] = formula
    def __getitem__( self, key ):
        return eval( self._cells[key], self )

ss = SpreadSheet()
ss['a1'] = '5'
ss['a2'] = 'a1*5'
ss['a2']


Follow-Ups:

Date: 2000-Sep-22 12:42
By: tim_one

Comment:
Changed Group to Feature Request.  Should be added to PEP 42 (I'll do that if nobody beats me to it).

CPython requires a genuine dict now for speed.  I believe JPython allows any mapping object.

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http://sourceforge.net/bugs/?func=detailbug&bug_id=115126&group_id=5470