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# numpy.lib.NumpyVersion

class numpy.lib.NumpyVersion(vstring)

  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.

  Parameters:
    vstring str

      NumPy version string (`np.__version__`).

  Examples

      >>> 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