I am walking a directory that contains eggs to add those eggs to the
>>> "2.3.1" > "10.1.1"
>>> from distutils.version import LooseVersion, StrictVersion >>> LooseVersion("2.3.1") < LooseVersion("10.1.2") True >>> StrictVersion("2.3.1") < StrictVersion("10.1.2") True >>> StrictVersion("1.3.a4") Traceback (most recent call last): ... ValueError: invalid version number '1.3.a4'
StrictVersion have been deprecated under PEP 386 and will at some point be replaced by
As the Python docs are empty, here's the relevant docstrings (based on Python 3.3) for reference (nicked from the source):
Every version number class implements the following interface:
- the 'parse' method takes a string and parses it to some internal representation; if the string is an invalid version number, 'parse' raises a
- the class constructor takes an optional string argument which, if supplied, is passed to 'parse'
__str__reconstructs the string that was passed to 'parse' (or an equivalent string -- ie. one that will generate an equivalent version number instance)
__repr__generates Python code to recreate the version number instance
_cmpcompares the current instance with either another instance of the same class or a string (which will be parsed to an instance of the same class, thus must follow the same rules)
Version numbering for anal retentives and software idealists. Implements the standard interface for version number classes as described above. A version number consists of two or three dot-separated numeric components, with an optional "pre-release" tag on the end. The pre-release tag consists of the letter 'a' or 'b' followed by a number. If the numeric components of two version numbers are equal, then one with a pre-release tag will always be deemed earlier (lesser) than one without.
The following are valid version numbers (shown in the order that would be obtained by sorting according to the supplied cmp function):
0.4 0.4.0 (these two are equivalent) 0.4.1 0.5a1 0.5b3 0.5 0.9.6 1.0 1.0.4a3 1.0.4b1 1.0.4
The following are examples of invalid version numbers:
1 18.104.22.168 1.3.a4 1.3pl1 1.3c4
The rationale for this version numbering system will be explained in the distutils documentation.
Version numbering for anarchists and software realists. Implements the standard interface for version number classes as described above. A version number consists of a series of numbers, separated by either periods or strings of letters. When comparing version numbers, the numeric components will be compared numerically, and the alphabetic components lexically. The following are all valid version numbers, in no particular order:
1.5.1 1.5.2b2 161 3.10a 8.02 3.4j 1996.07.12 3.2.pl0 22.214.171.124 2g6 11g 0.960923 2.2beta29 1.13++ 5.5.kw 2.0b1pl0
In fact, there is no such thing as an invalid version number under this scheme; the rules for comparison are simple and predictable, but may not always give the results you want (for some definition of "want").