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Editorial Team
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Asked: 2026-06-02T15:31:36+00:00

Importing NumPy in Python 3, I get the following error message: >>> import numpy

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Importing NumPy in Python 3, I get the following error message:

>>> import numpy
/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/numpy/random/__init__.py:91: RuntimeWarning: numpy.ndarray size changed, may indicate binary incompatibility
  from .mtrand import *
>>>

However, numpy is imported after that (e.g. I can call dir(numpy) to list its contents)

a) What does this message mean?

b) Since I am new to NumPy: Can you suggest a test for me to make sure NumPy is functioning properly?

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1 Answer

  1. Editorial Team

    I found this bug report which seems to say that the warning is not important. It looks like the bug report was marked as fixed, so future version of NumPy will not display the warning.

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