elfi.Prior and NoneType error

Summary:

The first line in the quickstart tutorial throws an error on my system. Not entirely sure what I’m doing wrong. Thanks in advance for the help!

Reproducible Steps:

The following reproduces my error.

import elfi
elfi.Prior('uniform', -2, 4)

Current Output:

The current error is pasted here:

>>> mu = elfi.Prior('uniform', -2, 4)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "~/Library/Python/3.6/lib/python/site-packages/elfi/model/elfi_model.py", line 676, in __init__
    super(Prior, self).__init__(distribution, *params, size=size, **kwargs)
  File "~/Library/Python/3.6/lib/python/site-packages/elfi/model/elfi_model.py", line 595, in __init__
    super(RandomVariable, self).__init__(*params, state=state, **kwargs)
  File "~/Library/Python/3.6/lib/python/site-packages/elfi/model/elfi_model.py", line 531, in __init__
    super(StochasticMixin, self).__init__(*parents, state=state, **kwargs)
  File "~/Library/Python/3.6/lib/python/site-packages/elfi/model/elfi_model.py", line 345, in __init__
    name = self._give_name(name, model)
  File "~/Library/Python/3.6/lib/python/site-packages/elfi/model/elfi_model.py", line 472, in _give_name
    while re.match('\s*super\(', info.code_context[0]):
TypeError: 'NoneType' object is not subscriptable

ELFI Version:

>>> import elfi; elfi.__version__
'0.6.0'
>>> import numpy; numpy.__version__
'1.13.1'
>>> import scipy; scipy.__version__
'0.19.1'

Python Version:

$ python3 --version
Python 3.6.1

Operating System:

Mac OS 10.12.5

$ sw_vers -productVersion 
10.12.5

[kskyten]

Does mu = elfi.Prior('uniform', -2, 4, name='mu') work for you?

[jlintusaari]

This has now been fixed in ELFI version 0.6.1 released today. When automatic naming cannot be done, ELFI will assign a random name unless the name argument is given.