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• Running Python 3.5 and Matplotlib 1.5.1
• Installed Matplotlib using pip3

Whenever I write the following statement at the beginning of a module
from mpl_toolkits.mplot3d import Axes3D

,I am returned the following error:

Traceback (most recent call last):
File "/Users/blah/blah/blah/scatter3d_demo.py", line 2, in
from mpl_toolkits.mplot3d import Axes3D
ValueError: source code string cannot contain null bytes

Presumably, either the mplot3d module or the Axes3D one has a null byte (I believe "\0") hidden somewhere, although I haven't found it in either module.