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_version.py
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"""Utility to compare (NumPy) version strings. The NumpyVersion class allows properly comparing numpy version strings. The LooseVersion and StrictVersion classes that distutils provides don't work; they don't recognize anything like alpha/beta/rc/dev versions. """ import re __all__ = ['NumpyVersion'] class 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. .. versionadded:: 1.9.0 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 """ def __init__(self, vstring): self.vstring = vstring ver_main = re.match(r'\d+\.\d+\.\d+', vstring) if not ver_main: raise ValueError("Not a valid numpy version string") self.version = ver_main.group() self.major, self.minor, self.bugfix = [int(x) for x in self.version.split('.')] if len(vstring) == ver_main.end(): self.pre_release = 'final' else: alpha = re.match(r'a\d', vstring[ver_main.end():]) beta = re.match(r'b\d', vstring[ver_main.end():]) rc = re.match(r'rc\d', vstring[ver_main.end():]) pre_rel = [m for m in [alpha, beta, rc] if m is not None] if pre_rel: self.pre_release = pre_rel[0].group() else: self.pre_release = '' self.is_devversion = bool(re.search(r'.dev', vstring)) def _compare_version(self, other): """Compare major.minor.bugfix""" if self.major == other.major: if self.minor == other.minor: if self.bugfix == other.bugfix: vercmp = 0 elif self.bugfix > other.bugfix: vercmp = 1 else: vercmp = -1 elif self.minor > other.minor: vercmp = 1 else: vercmp = -1 elif self.major > other.major: vercmp = 1 else: vercmp = -1 return vercmp def _compare_pre_release(self, other): """Compare alpha/beta/rc/final.""" if self.pre_release == other.pre_release: vercmp = 0 elif self.pre_release == 'final': vercmp = 1 elif other.pre_release == 'final': vercmp = -1 elif self.pre_release > other.pre_release: vercmp = 1 else: vercmp = -1 return vercmp def _compare(self, other): if not isinstance(other, (str, NumpyVersion)): raise ValueError("Invalid object to compare with NumpyVersion.") if isinstance(other, str): other = NumpyVersion(other) vercmp = self._compare_version(other) if vercmp == 0: # Same x.y.z version, check for alpha/beta/rc vercmp = self._compare_pre_release(other) if vercmp == 0: # Same version and same pre-release, check if dev version if self.is_devversion is other.is_devversion: vercmp = 0 elif self.is_devversion: vercmp = -1 else: vercmp = 1 return vercmp def __lt__(self, other): return self._compare(other) < 0 def __le__(self, other): return self._compare(other) <= 0 def __eq__(self, other): return self._compare(other) == 0 def __ne__(self, other): return self._compare(other) != 0 def __gt__(self, other): return self._compare(other) > 0 def __ge__(self, other): return self._compare(other) >= 0 def __repr__(self): return "NumpyVersion(%s)" % self.vstring