Error while importing networkx module in ArcMap10.6

Question

I defined a custom toolbox in ArcMap 10.6, the script ran perfectly when I first use it, but ran in error when I use the same script with same parameters again. After I restart ArcMap 10.6, I can use it perfectly again.

When I use the same script in ArcGIS Pro,it run perfectly. I want to know if it is a bug? If so, is it a ArcMap’s bug or a networkx package’s bug or others? And what can I do?

Here is the error message:

File "******caculate_network.py", line 7, in <module>
    import networkx as nx
  File "C:Python27ArcGIS10.6libsite-packagesnetworkx__init__.py", line 128, in <module>
    import networkx.drawing
  File "C:Python27ArcGIS10.6libsite-packagesnetworkxdrawing__init__.py", line 6, in <module>
    from . import nx_pydot
  File "C:Python27ArcGIS10.6libsite-packagesnetworkxdrawingnx_pydot.py", line 27, in <module>
    from pkg_resources import parse_version
  File "C:Python27ArcGIS10.6libsite-packagespkg_resources__init__.py", line 48, in <module>
    from pkg_resources.extern import six
  File "C:Python27ArcGIS10.6libsite-packagespkg_resourcesextern__init__.py", line 45, in load_module
    mod = sys.modules[extant]
AttributeError: 'NoneType' object has no attribute 'modules'

arcgis desktop arcpy networkx

Damijan · Answer

I have found a stupid workaround that worked in my case.

I could succesfully run my Python script importing tablib, but only the first run was successful. Until I have tried to import this library in Python window first before running the script. All successive script runs were without any error. Although I do not believe that it is relevant here are the specs:

ArcGIS 10.5.1 v. 7333 (no patches applied), Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)] on win32, tablib version 0.14.0

And the code that have triggered this error

import sys, arcpy, os

import tablib

and the error

Traceback (most recent call last):
  File "D:DataTestTestTabLib.py", line 9, in <module>
    import tablib
  File "C:Python27ArcGIS10.5libsite-packagestablib__init__.py", line 2, in <module>
    from pkg_resources import get_distribution, DistributionNotFound
  File "C:Python27ArcGIS10.5libsite-packagespkg_resources__init__.py", line 48, in <module>
    from pkg_resources.extern import six
  File "C:Python27ArcGIS10.5libsite-packagespkg_resourcesextern__init__.py", line 44, in load_module
    mod = sys.modules[extant]
AttributeError: 'NoneType' object has no attribute 'modules'

Error while importing networkx module in ArcMap10.6

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