numpy.lib._version.NumpyVersion

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.

>>> 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