Constructing an if statement from the client data in python

[Benjamin Kaplan]

All the operators are available as functions in the operator module.
Just use a dict to select the correct function.


import operator

ops = {"and": operator.and_, "or": operator.or_}

op1 = ops[lo1]
op3 = ops[lo3]

if op3( op1( condition1, condition2), condition4) :
    #do something



On Tue, Apr 13, 2010 at 11:56 AM, Vishal Rana <ranavishal at gmail.com> wrote:
>
> Hi,
>
> I need to construct an if statement from the data coming from the client as below:
>
> conditions: condition1, condition2, condition3, condition4 logical operators: lo1, lo2, lo3 (Possible values: "and" "or")
>
> Eg.
>
> if condition1 lo1 condition2 lo3 condition4:
>
>     # Do something
>
> I can think of eval/exec but not sure how safe they are! Any better approach or alternative? Appreciate your responses :)
>
> PS: Client-side: Flex, Server-side: Python, over internet
>
> Thanks
>
> Vishal
>
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>