fail to import mass module from pyteomics

[assaf...@gmail.com]

Hi

I installed pyteomics with conda and when I try to import mass module into my code I get the following error: 

Traceback (most recent call last):

  File "<ipython-input-128-e26ae995bc0e>", line 1, in <module>

    from pyteomics import mass

  File "C:\Users\assafk\AppData\Local\conda\conda\envs\merbl36\lib\site-packages\pyteomics\mass\__init__.py", line 1, in <module>

    from .mass import *

  File "C:\Users\assafk\AppData\Local\conda\conda\envs\merbl36\lib\site-packages\pyteomics\mass\mass.py", line 389, in <module>

    'A':   Composition({'H': 5, 'C': 3, 'O': 1, 'N': 1}),

  File "C:\Users\assafk\AppData\Local\conda\conda\envs\merbl36\lib\site-packages\pyteomics\mass\mass.py", line 299, in __init__

    self._from_composition(args[0])

  File "C:\Users\assafk\AppData\Local\conda\conda\envs\merbl36\lib\site-packages\pyteomics\mass\mass.py", line 218, in _from_composition

    self[_make_isotope_string(element_name, isotope_num)] = num_atoms

  File "C:\Users\assafk\AppData\Local\conda\conda\envs\merbl36\lib\site-packages\pyteomics\auxiliary\structures.py", line 173, in __setitem__

    super(BasicComposition, self).__setitem__(key, value)

TypeError: super(type, obj): obj must be an instance or subtype of type

python version 3.6

can you help?

thanks

Assaf

[Joshua Klein]

Do you get this problem when you start a new Python interpreter session and directly import pyteomics.mass?

This problem can occur when you use importlib.reload on a module defining a base class of another class, which was either not defined in the reloaded module, or was imported by another module that was not reloaded.

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