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command eval python string

How can I convert string to source code in python?

发布于 2017-05-09 19:37:15

As you see, ifinner is a string, so if I just write after if, always will be true. What can i do, to concert it to source code? 

    x=2
    ifinner = "x==3"
    if ifinner:
        print("Yeah")
    else:
        print("It works!")
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Turcsi
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Laurent LAPORTE 2017-05-10 03:41:30

You can use eval() function to evaluate Python source code.

Quoting the documentation:

eval(expression, globals=None, locals=None)

The arguments are a string and optional globals and locals. If provided, globals must be a dictionary. If provided, locals can be any mapping object.

MSeifert 2017-05-09 19:43:53

but never use eval on any string that you didn't create yourself (or from a trusted source)!

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