How to evaluate an expression present within string?

Question

Here I need to evaluate an expression present within string.

for eg,

>> a = '5 + 6'
>> a = 5 + 6

How to achieve this?

Answer 1

You could use eval method by passing an expression as argument. The expression argument is parsed and evaluated as a Python expression.

a = eval('5 + 6')

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Answer 2

You can use eval() as it treats string as code.

a = '5 + 6'

eval(a)