"'NoneType' is not callable" error for datetime after closing Jep. [Jep 3.7, Python 3.6, Fedora 24]

[Daniel Barker]

Hi, 

I'm having trouble closing and then opening new Jep interpreters. Please see the following code

        JepConfig jepConfig = new JepConfig();

        jepConfig.setInteractive(false);

        final boolean succeed = false;

        Jep jep1 = new Jep(jepConfig);

        jep1.eval("from datetime import datetime");

        if (succeed)

            jep1.eval("print(datetime.strftime(datetime.now(), '%Y-%m-%d'))");

        else

            jep1.eval("print(datetime.strptime('2017-10-01', '%Y-%m-%d').date())");

        jep1.close();

        Jep jep2 = new Jep(jepConfig);

        jep2.eval("from datetime import datetime");

        if (succeed)

            jep2.eval("print(datetime.strftime(datetime.now(), '%Y-%m-%d'))");

        else

            jep2.eval("print(datetime.strptime('2017-10-01', '%Y-%m-%d').date())");

        jep2.close();

It should be quite obvious what it does; the branch with `succeed=true` runs fine and outputs twice the current date, whereas the branch with `succeed=false` throws the following error

2017-10-01

Exception in thread "main" jep.JepException: <class 'TypeError'>: attribute of type 'NoneType' is not callable

at <string>.<module>(<string>:1)

at jep.Jep.eval(Native Method)

at jep.Jep.eval(Jep.java:609)

at jep.test.TestCloseJep.main(TestCloseJep.java:28)

This feels like a bug with Jep since I would expect the instances `jep1` and `jep2` to have no bearing on each other since I'm not using any shared modules. Is this correct or am I just doing something wrong? If it is a bug, how can I work around this until it's fixed?

Thanks,

Dan 

[Ben Steffensmeier]

Hi Dan,

This is actually a known bug in python when using embedded interpreters, see python issue 27400. I have been able to work around this bug by adding _strptime as a shared module in the jep configuration.

Ben

[Daniel Barker]

Great, that worked. Thanks very much.