asking for alternate method apart from eval in python
Question: **Problem i am solving:** i am giving liberty to user to make conditions and
actions for making rules while inserting data into a database and evaluate
these conditions and action, i could not think anything else from using eval ,
an example of datastructure i created for such purpose is

    
    
    action_var = ""
    a_hash = {"condition":a_condition,
              "action":a_hash}
    a_condition ={"param":"abc",
                  "operator":">",
                  "value":"cde"}
    a_action = {"param":action_var,
                "operation":"=",
                "value":"action
    

So my plan is to take condition id from user and action id from user and then
use eval to evaluate the expression .

**Help** : Am i going in right direction, is there alternate method to do this
?

**P.S:** I can't use triggers on database, I am kind of using orm wrapper for
lmdb. So i use write command at base level.

Edit: i want to have multiple conditions, with and/or mixed, with brackets.

Thanks


Answer: You don't need to use `eval`. Map those operators to functions and then apply
the functions to the arguments. Consider:

    
    
    >>> import operator
    >>> operators = {}
    >>> operators['>'] = operator.gt
    >>> operators['>'](*[1, 2])
    False
    >>> 1 > 2
    False
    

