How can I substitute an object in a python string ?

Question

I have an object of class Employee.

#  For Example
>>> employee1 = Employee()

I need to substitute the object employee1 in below expression. The expression will be dynamic

>>> expr = "object.basic_sal * 0.10 + 500"

For Example,

>>> employee1 = Employee()
>>> employee1.basic_sal = 10000
>>> expr = "object.basic_sal * 0.10 + 500"

>>> eval_expr(object=employee1, expression=expr)
1500

I could not find similar questions.
Please help me.

I think a function will more suitable. why not using function? — pwxcoo
– pwxcoo, Commented Aug 14, 2018 at 8:45
The expression will be variable. So I need to write each functions for each cases. I just need like eval() function. — Shameem
– Shameem, Commented Aug 14, 2018 at 8:48

Eugene Yarmash · Accepted Answer · 2018-08-14 08:58:48Z

0

You can use str.format() to interpolate values into strings:

expr = "{object.basic_sal} * 0.10 + 500".format(object=employee1)

To evaluate the expression you can use the eval() function, although it is not generally recommended because of security risks.

result = eval(expr)

edited Aug 14, 2018 at 8:58

answered Aug 14, 2018 at 8:47

Eugene Yarmash

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