Creating julia.Julia() instance crashes python

[ChristianF88]

C:\Users\Gabi>python
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.

import julia
j=julia.Julia()

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
Exception: EXCEPTION_ACCESS_VIOLATION at 0x4ddcec4 -- PyUnicodeUCS2_DecodeLatin1 at C:\Users\Gabi.julia\v0.6\Conda\deps\usr\python27.DLL (unknown line)
while loading no file, in expression starting on line 0
PyUnicodeUCS2_DecodeLatin1 at C:\Users\Gabi.julia\v0.6\Conda\deps\usr\python27.DLL (unknown line)
PyObject_GenericGetAttrWithDict at C:\Users\Gabi.julia\v0.6\Conda\deps\usr\python27.DLL (unknown line)
PyEval_EvalFrameDefault at C:\Program Files\Python36\python36.dll (unknown line)
PyObject_CallFunctionObjArgs at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalFrameDefault at C:\Program Files\Python36\python36.dll (unknown line)
PyObject_CallFunctionObjArgs at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalFrameDefault at C:\Program Files\Python36\python36.dll (unknown line)
PyObject_CallFunctionObjArgs at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalFrameDefault at C:\Program Files\Python36\python36.dll (unknown line)
Py_CheckFunctionResult at C:\Program Files\Python36\python36.dll (unknown line)
PyFunction_FastCallDict at C:\Program Files\Python36\python36.dll (unknown line)
PyObject_IsInstance at C:\Program Files\Python36\python36.dll (unknown line)
PyType_GenericAlloc at C:\Program Files\Python36\python36.dll (unknown line)
Py_CheckFunctionResult at C:\Program Files\Python36\python36.dll (unknown line)
PyObject_CallFunctionObjArgs at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalFrameDefault at C:\Program Files\Python36\python36.dll (unknown line)
Py_CheckFunctionResult at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalCodeEx at C:\Program Files\Python36\python36.dll (unknown line)
PyEval_EvalCode at C:\Program Files\Python36\python36.dll (unknown line)
PyArena_Free at C:\Program Files\Python36\python36.dll (unknown line)
PyRun_InteractiveOneObject at C:\Program Files\Python36\python36.dll (unknown line)
PyRun_InteractiveLoopFlags at C:\Program Files\Python36\python36.dll (unknown line)
PyRun_AnyFileExFlags at C:\Program Files\Python36\python36.dll (unknown line)
Py_hashtable_size at C:\Program Files\Python36\python36.dll (unknown line)
Py_FatalError at C:\Program Files\Python36\python36.dll (unknown line)
unknown function (ip: 000000001CB4126C)
BaseThreadInitThunk at C:\Windows\System32\KERNEL32.DLL (unknown line)
RtlUserThreadStart at C:\Windows\SYSTEM32\ntdll.dll (unknown line)
Allocations: 3472341 (Pool: 3470925; Big: 1416); GC: 5

[jlperla]

I had pretty much the same error starting from scratch the first time these were installed.

Reproducing was pretty easy:

1. Install Python 3.6.4 |Anaconda, Inc.| on Windows 10.
2. Make sure Julia is in the path. I am using Julia 0.6.3
3. On Julia Pkg.add("PyCall") . For what it is worth,

julia> Pkg.installed("PyCall")
v"1.17.0"

4. I precompiled in julia with using PyCall just to make sure it was loading.
5. in a terminal pip install julia
6. In a python interpreter I just followed the example:

import julia
j = julia.Julia()

where I the same error as @ChristianF88 at that point. I notice that it is saying v0.6\Conda\deps\usr\python27.DLL in some of the error messages, where we both are using Python 3. Could that be part of the problem? Is python 3 actually supported?

[jlperla]

Also, I verified that this is happening from the master as well.

[jlperla]

@ChristianF88 For me, at least, I tracked down the issue: You need to build PyCall to point at the same python interpreter you are using to call pyjulia.

I added #169 to make things more clear in the documentation.

[ChristianF88]

Thanks a bunch!

[jlaydevant]

@jlperla Thanks for the tip!! I had the same issue and functions perfectly for me now

[tkf]

PyJulia 0.2 is out now. So I consider this to be resolved.