/NumPy 1.17


class numpy.lib.NumpyVersion(vstring) [source]

Parse and compare numpy version strings.

NumPy has the following versioning scheme (numbers given are examples; they can be > 9) in principle):

  • Released version: ‘1.8.0’, ‘1.8.1’, etc.
  • Alpha: ‘1.8.0a1’, ‘1.8.0a2’, etc.
  • Beta: ‘1.8.0b1’, ‘1.8.0b2’, etc.
  • Release candidates: ‘1.8.0rc1’, ‘1.8.0rc2’, etc.
  • Development versions: ‘1.8.0.dev-f1234afa’ (git commit hash appended)
  • Development versions after a1: ‘1.8.0a1.dev-f1234afa’,
    ‘1.8.0b2.dev-f1234afa’, ‘1.8.1rc1.dev-f1234afa’, etc.
  • Development versions (no git hash available): ‘1.8.0.dev-Unknown’

Comparing needs to be done against a valid version string or other NumpyVersion instance. Note that all development versions of the same (pre-)release compare equal.

New in version 1.9.0.

vstring : str

NumPy version string (np.__version__).


>>> from numpy.lib import NumpyVersion
>>> if NumpyVersion(np.__version__) < '1.7.0':
...     print('skip')
>>> # skip
>>> NumpyVersion('1.7')  # raises ValueError, add ".0"
Traceback (most recent call last):
ValueError: Not a valid numpy version string

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