import cannot be used inside eval

Chris Angelico rosuav at gmail.com
Thu Feb 4 03:48:43 EST 2016


On Thu, Feb 4, 2016 at 4:03 PM, 阎兆珣 <yanzhaoxun at greendh.com> wrote:
>    a = input("tell me which py to execute:  ")
>
>    print(a)
>
>    print('import '+a)
>
>    print(type('import'+a))
>
>    eval('print(a)')
>
>    try:
>
>        eval('import '+a)
>
>    except Exception as e:
>
>        print('Error: ', e)
>
>    ##while True:
>
>    ##    pass
>
>    @python 3.4.2
>
>    this code attempts to run a .py file that user specifies.
>
>    eval() does fine with print() command
>
>    but fails to call import command

The eval() function evaluates an expression. It won't handle
statements (if, for, while), and import is a statement. Possibly you
want exec instead.

ChrisA


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