5 changed files with 631 additions and 1 deletions
@ -0,0 +1,279 @@
|
||||
A. HISTORY OF THE SOFTWARE |
||||
========================== |
||||
|
||||
Python was created in the early 1990s by Guido van Rossum at Stichting |
||||
Mathematisch Centrum (CWI, see http://www.cwi.nl) in the Netherlands |
||||
as a successor of a language called ABC. Guido remains Python's |
||||
principal author, although it includes many contributions from others. |
||||
|
||||
In 1995, Guido continued his work on Python at the Corporation for |
||||
National Research Initiatives (CNRI, see http://www.cnri.reston.va.us) |
||||
in Reston, Virginia where he released several versions of the |
||||
software. |
||||
|
||||
In May 2000, Guido and the Python core development team moved to |
||||
BeOpen.com to form the BeOpen PythonLabs team. In October of the same |
||||
year, the PythonLabs team moved to Digital Creations, which became |
||||
Zope Corporation. In 2001, the Python Software Foundation (PSF, see |
||||
https://www.python.org/psf/) was formed, a non-profit organization |
||||
created specifically to own Python-related Intellectual Property. |
||||
Zope Corporation was a sponsoring member of the PSF. |
||||
|
||||
All Python releases are Open Source (see http://www.opensource.org for |
||||
the Open Source Definition). Historically, most, but not all, Python |
||||
releases have also been GPL-compatible; the table below summarizes |
||||
the various releases. |
||||
|
||||
Release Derived Year Owner GPL- |
||||
from compatible? (1) |
||||
|
||||
0.9.0 thru 1.2 1991-1995 CWI yes |
||||
1.3 thru 1.5.2 1.2 1995-1999 CNRI yes |
||||
1.6 1.5.2 2000 CNRI no |
||||
2.0 1.6 2000 BeOpen.com no |
||||
1.6.1 1.6 2001 CNRI yes (2) |
||||
2.1 2.0+1.6.1 2001 PSF no |
||||
2.0.1 2.0+1.6.1 2001 PSF yes |
||||
2.1.1 2.1+2.0.1 2001 PSF yes |
||||
2.1.2 2.1.1 2002 PSF yes |
||||
2.1.3 2.1.2 2002 PSF yes |
||||
2.2 and above 2.1.1 2001-now PSF yes |
||||
|
||||
Footnotes: |
||||
|
||||
(1) GPL-compatible doesn't mean that we're distributing Python under |
||||
the GPL. All Python licenses, unlike the GPL, let you distribute |
||||
a modified version without making your changes open source. The |
||||
GPL-compatible licenses make it possible to combine Python with |
||||
other software that is released under the GPL; the others don't. |
||||
|
||||
(2) According to Richard Stallman, 1.6.1 is not GPL-compatible, |
||||
because its license has a choice of law clause. According to |
||||
CNRI, however, Stallman's lawyer has told CNRI's lawyer that 1.6.1 |
||||
is "not incompatible" with the GPL. |
||||
|
||||
Thanks to the many outside volunteers who have worked under Guido's |
||||
direction to make these releases possible. |
||||
|
||||
|
||||
B. TERMS AND CONDITIONS FOR ACCESSING OR OTHERWISE USING PYTHON |
||||
=============================================================== |
||||
|
||||
Python software and documentation are licensed under the |
||||
Python Software Foundation License Version 2. |
||||
|
||||
Starting with Python 3.8.6, examples, recipes, and other code in |
||||
the documentation are dual licensed under the PSF License Version 2 |
||||
and the Zero-Clause BSD license. |
||||
|
||||
Some software incorporated into Python is under different licenses. |
||||
The licenses are listed with code falling under that license. |
||||
|
||||
|
||||
PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 |
||||
-------------------------------------------- |
||||
|
||||
1. This LICENSE AGREEMENT is between the Python Software Foundation |
||||
("PSF"), and the Individual or Organization ("Licensee") accessing and |
||||
otherwise using this software ("Python") in source or binary form and |
||||
its associated documentation. |
||||
|
||||
2. Subject to the terms and conditions of this License Agreement, PSF hereby |
||||
grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce, |
||||
analyze, test, perform and/or display publicly, prepare derivative works, |
||||
distribute, and otherwise use Python alone or in any derivative version, |
||||
provided, however, that PSF's License Agreement and PSF's notice of copyright, |
||||
i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
||||
2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Python Software Foundation; |
||||
All Rights Reserved" are retained in Python alone or in any derivative version |
||||
prepared by Licensee. |
||||
|
||||
3. In the event Licensee prepares a derivative work that is based on |
||||
or incorporates Python or any part thereof, and wants to make |
||||
the derivative work available to others as provided herein, then |
||||
Licensee hereby agrees to include in any such work a brief summary of |
||||
the changes made to Python. |
||||
|
||||
4. PSF is making Python available to Licensee on an "AS IS" |
||||
basis. PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR |
||||
IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND |
||||
DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS |
||||
FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT |
||||
INFRINGE ANY THIRD PARTY RIGHTS. |
||||
|
||||
5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON |
||||
FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS |
||||
A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON, |
||||
OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. |
||||
|
||||
6. This License Agreement will automatically terminate upon a material |
||||
breach of its terms and conditions. |
||||
|
||||
7. Nothing in this License Agreement shall be deemed to create any |
||||
relationship of agency, partnership, or joint venture between PSF and |
||||
Licensee. This License Agreement does not grant permission to use PSF |
||||
trademarks or trade name in a trademark sense to endorse or promote |
||||
products or services of Licensee, or any third party. |
||||
|
||||
8. By copying, installing or otherwise using Python, Licensee |
||||
agrees to be bound by the terms and conditions of this License |
||||
Agreement. |
||||
|
||||
|
||||
BEOPEN.COM LICENSE AGREEMENT FOR PYTHON 2.0 |
||||
------------------------------------------- |
||||
|
||||
BEOPEN PYTHON OPEN SOURCE LICENSE AGREEMENT VERSION 1 |
||||
|
||||
1. This LICENSE AGREEMENT is between BeOpen.com ("BeOpen"), having an |
||||
office at 160 Saratoga Avenue, Santa Clara, CA 95051, and the |
||||
Individual or Organization ("Licensee") accessing and otherwise using |
||||
this software in source or binary form and its associated |
||||
documentation ("the Software"). |
||||
|
||||
2. Subject to the terms and conditions of this BeOpen Python License |
||||
Agreement, BeOpen hereby grants Licensee a non-exclusive, |
||||
royalty-free, world-wide license to reproduce, analyze, test, perform |
||||
and/or display publicly, prepare derivative works, distribute, and |
||||
otherwise use the Software alone or in any derivative version, |
||||
provided, however, that the BeOpen Python License is retained in the |
||||
Software, alone or in any derivative version prepared by Licensee. |
||||
|
||||
3. BeOpen is making the Software available to Licensee on an "AS IS" |
||||
basis. BEOPEN MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR |
||||
IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, BEOPEN MAKES NO AND |
||||
DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS |
||||
FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE WILL NOT |
||||
INFRINGE ANY THIRD PARTY RIGHTS. |
||||
|
||||
4. BEOPEN SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF THE |
||||
SOFTWARE FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS |
||||
AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE SOFTWARE, OR ANY |
||||
DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. |
||||
|
||||
5. This License Agreement will automatically terminate upon a material |
||||
breach of its terms and conditions. |
||||
|
||||
6. This License Agreement shall be governed by and interpreted in all |
||||
respects by the law of the State of California, excluding conflict of |
||||
law provisions. Nothing in this License Agreement shall be deemed to |
||||
create any relationship of agency, partnership, or joint venture |
||||
between BeOpen and Licensee. This License Agreement does not grant |
||||
permission to use BeOpen trademarks or trade names in a trademark |
||||
sense to endorse or promote products or services of Licensee, or any |
||||
third party. As an exception, the "BeOpen Python" logos available at |
||||
http://www.pythonlabs.com/logos.html may be used according to the |
||||
permissions granted on that web page. |
||||
|
||||
7. By copying, installing or otherwise using the software, Licensee |
||||
agrees to be bound by the terms and conditions of this License |
||||
Agreement. |
||||
|
||||
|
||||
CNRI LICENSE AGREEMENT FOR PYTHON 1.6.1 |
||||
--------------------------------------- |
||||
|
||||
1. This LICENSE AGREEMENT is between the Corporation for National |
||||
Research Initiatives, having an office at 1895 Preston White Drive, |
||||
Reston, VA 20191 ("CNRI"), and the Individual or Organization |
||||
("Licensee") accessing and otherwise using Python 1.6.1 software in |
||||
source or binary form and its associated documentation. |
||||
|
||||
2. Subject to the terms and conditions of this License Agreement, CNRI |
||||
hereby grants Licensee a nonexclusive, royalty-free, world-wide |
||||
license to reproduce, analyze, test, perform and/or display publicly, |
||||
prepare derivative works, distribute, and otherwise use Python 1.6.1 |
||||
alone or in any derivative version, provided, however, that CNRI's |
||||
License Agreement and CNRI's notice of copyright, i.e., "Copyright (c) |
||||
1995-2001 Corporation for National Research Initiatives; All Rights |
||||
Reserved" are retained in Python 1.6.1 alone or in any derivative |
||||
version prepared by Licensee. Alternately, in lieu of CNRI's License |
||||
Agreement, Licensee may substitute the following text (omitting the |
||||
quotes): "Python 1.6.1 is made available subject to the terms and |
||||
conditions in CNRI's License Agreement. This Agreement together with |
||||
Python 1.6.1 may be located on the internet using the following |
||||
unique, persistent identifier (known as a handle): 1895.22/1013. This |
||||
Agreement may also be obtained from a proxy server on the internet |
||||
using the following URL: http://hdl.handle.net/1895.22/1013". |
||||
|
||||
3. In the event Licensee prepares a derivative work that is based on |
||||
or incorporates Python 1.6.1 or any part thereof, and wants to make |
||||
the derivative work available to others as provided herein, then |
||||
Licensee hereby agrees to include in any such work a brief summary of |
||||
the changes made to Python 1.6.1. |
||||
|
||||
4. CNRI is making Python 1.6.1 available to Licensee on an "AS IS" |
||||
basis. CNRI MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR |
||||
IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, CNRI MAKES NO AND |
||||
DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS |
||||
FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON 1.6.1 WILL NOT |
||||
INFRINGE ANY THIRD PARTY RIGHTS. |
||||
|
||||
5. CNRI SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON |
||||
1.6.1 FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS |
||||
A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON 1.6.1, |
||||
OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF. |
||||
|
||||
6. This License Agreement will automatically terminate upon a material |
||||
breach of its terms and conditions. |
||||
|
||||
7. This License Agreement shall be governed by the federal |
||||
intellectual property law of the United States, including without |
||||
limitation the federal copyright law, and, to the extent such |
||||
U.S. federal law does not apply, by the law of the Commonwealth of |
||||
Virginia, excluding Virginia's conflict of law provisions. |
||||
Notwithstanding the foregoing, with regard to derivative works based |
||||
on Python 1.6.1 that incorporate non-separable material that was |
||||
previously distributed under the GNU General Public License (GPL), the |
||||
law of the Commonwealth of Virginia shall govern this License |
||||
Agreement only as to issues arising under or with respect to |
||||
Paragraphs 4, 5, and 7 of this License Agreement. Nothing in this |
||||
License Agreement shall be deemed to create any relationship of |
||||
agency, partnership, or joint venture between CNRI and Licensee. This |
||||
License Agreement does not grant permission to use CNRI trademarks or |
||||
trade name in a trademark sense to endorse or promote products or |
||||
services of Licensee, or any third party. |
||||
|
||||
8. By clicking on the "ACCEPT" button where indicated, or by copying, |
||||
installing or otherwise using Python 1.6.1, Licensee agrees to be |
||||
bound by the terms and conditions of this License Agreement. |
||||
|
||||
ACCEPT |
||||
|
||||
|
||||
CWI LICENSE AGREEMENT FOR PYTHON 0.9.0 THROUGH 1.2 |
||||
-------------------------------------------------- |
||||
|
||||
Copyright (c) 1991 - 1995, Stichting Mathematisch Centrum Amsterdam, |
||||
The Netherlands. All rights reserved. |
||||
|
||||
Permission to use, copy, modify, and distribute this software and its |
||||
documentation for any purpose and without fee is hereby granted, |
||||
provided that the above copyright notice appear in all copies and that |
||||
both that copyright notice and this permission notice appear in |
||||
supporting documentation, and that the name of Stichting Mathematisch |
||||
Centrum or CWI not be used in advertising or publicity pertaining to |
||||
distribution of the software without specific, written prior |
||||
permission. |
||||
|
||||
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
||||
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
||||
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
||||
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
||||
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
||||
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
||||
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
||||
|
||||
ZERO-CLAUSE BSD LICENSE FOR CODE IN THE PYTHON DOCUMENTATION |
||||
---------------------------------------------------------------------- |
||||
|
||||
Permission to use, copy, modify, and/or distribute this software for any |
||||
purpose with or without fee is hereby granted. |
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH |
||||
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
||||
AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, |
||||
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM |
||||
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
||||
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
||||
PERFORMANCE OF THIS SOFTWARE. |
||||
@ -0,0 +1,4 @@
|
||||
"""(part of) distutils, taken from the cpython standard library |
||||
|
||||
at commit https://github.com/python/cpython/tree/9d38120e335357a3b294277fd5eff0a10e46e043/Lib/distutils |
||||
""" |
||||
@ -0,0 +1,347 @@
|
||||
# |
||||
# distutils/version.py |
||||
# |
||||
# Implements multiple version numbering conventions for the |
||||
# Python Module Distribution Utilities. |
||||
# |
||||
# $Id$ |
||||
# |
||||
|
||||
"""Provides classes to represent module version numbers (one class for |
||||
each style of version numbering). There are currently two such classes |
||||
implemented: StrictVersion and LooseVersion. |
||||
|
||||
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 ValueError exception |
||||
* 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 |
||||
* _cmp compares 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) |
||||
""" |
||||
|
||||
import re |
||||
|
||||
class Version: |
||||
"""Abstract base class for version numbering classes. Just provides |
||||
constructor (__init__) and reproducer (__repr__), because those |
||||
seem to be the same for all version numbering classes; and route |
||||
rich comparisons to _cmp. |
||||
""" |
||||
|
||||
def __init__ (self, vstring=None): |
||||
if vstring: |
||||
self.parse(vstring) |
||||
|
||||
def __repr__ (self): |
||||
return "%s ('%s')" % (self.__class__.__name__, str(self)) |
||||
|
||||
def __eq__(self, other): |
||||
c = self._cmp(other) |
||||
if c is NotImplemented: |
||||
return c |
||||
return c == 0 |
||||
|
||||
def __lt__(self, other): |
||||
c = self._cmp(other) |
||||
if c is NotImplemented: |
||||
return c |
||||
return c < 0 |
||||
|
||||
def __le__(self, other): |
||||
c = self._cmp(other) |
||||
if c is NotImplemented: |
||||
return c |
||||
return c <= 0 |
||||
|
||||
def __gt__(self, other): |
||||
c = self._cmp(other) |
||||
if c is NotImplemented: |
||||
return c |
||||
return c > 0 |
||||
|
||||
def __ge__(self, other): |
||||
c = self._cmp(other) |
||||
if c is NotImplemented: |
||||
return c |
||||
return c >= 0 |
||||
|
||||
|
||||
# Interface for version-number classes -- must be implemented |
||||
# by the following classes (the concrete ones -- Version should |
||||
# be treated as an abstract class). |
||||
# __init__ (string) - create and take same action as 'parse' |
||||
# (string parameter is optional) |
||||
# parse (string) - convert a string representation to whatever |
||||
# internal representation is appropriate for |
||||
# this style of version numbering |
||||
# __str__ (self) - convert back to a string; should be very similar |
||||
# (if not identical to) the string supplied to parse |
||||
# __repr__ (self) - generate Python code to recreate |
||||
# the instance |
||||
# _cmp (self, other) - compare two version numbers ('other' may |
||||
# be an unparsed version string, or another |
||||
# instance of your version class) |
||||
|
||||
|
||||
class StrictVersion (Version): |
||||
|
||||
"""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 |
||||
2.7.2.2 |
||||
1.3.a4 |
||||
1.3pl1 |
||||
1.3c4 |
||||
|
||||
The rationale for this version numbering system will be explained |
||||
in the distutils documentation. |
||||
""" |
||||
|
||||
version_re = re.compile(r'^(\d+) \. (\d+) (\. (\d+))? ([ab](\d+))?$', |
||||
re.VERBOSE | re.ASCII) |
||||
|
||||
|
||||
def parse (self, vstring): |
||||
match = self.version_re.match(vstring) |
||||
if not match: |
||||
raise ValueError("invalid version number '%s'" % vstring) |
||||
|
||||
(major, minor, patch, prerelease, prerelease_num) = \ |
||||
match.group(1, 2, 4, 5, 6) |
||||
|
||||
if patch: |
||||
self.version = tuple(map(int, [major, minor, patch])) |
||||
else: |
||||
self.version = tuple(map(int, [major, minor])) + (0,) |
||||
|
||||
if prerelease: |
||||
self.prerelease = (prerelease[0], int(prerelease_num)) |
||||
else: |
||||
self.prerelease = None |
||||
|
||||
|
||||
def __str__ (self): |
||||
|
||||
if self.version[2] == 0: |
||||
vstring = '.'.join(map(str, self.version[0:2])) |
||||
else: |
||||
vstring = '.'.join(map(str, self.version)) |
||||
|
||||
if self.prerelease: |
||||
vstring = vstring + self.prerelease[0] + str(self.prerelease[1]) |
||||
|
||||
return vstring |
||||
|
||||
|
||||
def _cmp (self, other): |
||||
if isinstance(other, str): |
||||
other = StrictVersion(other) |
||||
elif not isinstance(other, StrictVersion): |
||||
return NotImplemented |
||||
|
||||
if self.version != other.version: |
||||
# numeric versions don't match |
||||
# prerelease stuff doesn't matter |
||||
if self.version < other.version: |
||||
return -1 |
||||
else: |
||||
return 1 |
||||
|
||||
# have to compare prerelease |
||||
# case 1: neither has prerelease; they're equal |
||||
# case 2: self has prerelease, other doesn't; other is greater |
||||
# case 3: self doesn't have prerelease, other does: self is greater |
||||
# case 4: both have prerelease: must compare them! |
||||
|
||||
if (not self.prerelease and not other.prerelease): |
||||
return 0 |
||||
elif (self.prerelease and not other.prerelease): |
||||
return -1 |
||||
elif (not self.prerelease and other.prerelease): |
||||
return 1 |
||||
elif (self.prerelease and other.prerelease): |
||||
if self.prerelease == other.prerelease: |
||||
return 0 |
||||
elif self.prerelease < other.prerelease: |
||||
return -1 |
||||
else: |
||||
return 1 |
||||
else: |
||||
assert False, "never get here" |
||||
|
||||
# end class StrictVersion |
||||
|
||||
|
||||
# The rules according to Greg Stein: |
||||
# 1) a version number has 1 or more numbers separated by a period or by |
||||
# sequences of letters. If only periods, then these are compared |
||||
# left-to-right to determine an ordering. |
||||
# 2) sequences of letters are part of the tuple for comparison and are |
||||
# compared lexicographically |
||||
# 3) recognize the numeric components may have leading zeroes |
||||
# |
||||
# The LooseVersion class below implements these rules: a version number |
||||
# string is split up into a tuple of integer and string components, and |
||||
# comparison is a simple tuple comparison. This means that version |
||||
# numbers behave in a predictable and obvious way, but a way that might |
||||
# not necessarily be how people *want* version numbers to behave. There |
||||
# wouldn't be a problem if people could stick to purely numeric version |
||||
# numbers: just split on period and compare the numbers as tuples. |
||||
# However, people insist on putting letters into their version numbers; |
||||
# the most common purpose seems to be: |
||||
# - indicating a "pre-release" version |
||||
# ('alpha', 'beta', 'a', 'b', 'pre', 'p') |
||||
# - indicating a post-release patch ('p', 'pl', 'patch') |
||||
# but of course this can't cover all version number schemes, and there's |
||||
# no way to know what a programmer means without asking him. |
||||
# |
||||
# The problem is what to do with letters (and other non-numeric |
||||
# characters) in a version number. The current implementation does the |
||||
# obvious and predictable thing: keep them as strings and compare |
||||
# lexically within a tuple comparison. This has the desired effect if |
||||
# an appended letter sequence implies something "post-release": |
||||
# eg. "0.99" < "0.99pl14" < "1.0", and "5.001" < "5.001m" < "5.002". |
||||
# |
||||
# However, if letters in a version number imply a pre-release version, |
||||
# the "obvious" thing isn't correct. Eg. you would expect that |
||||
# "1.5.1" < "1.5.2a2" < "1.5.2", but under the tuple/lexical comparison |
||||
# implemented here, this just isn't so. |
||||
# |
||||
# Two possible solutions come to mind. The first is to tie the |
||||
# comparison algorithm to a particular set of semantic rules, as has |
||||
# been done in the StrictVersion class above. This works great as long |
||||
# as everyone can go along with bondage and discipline. Hopefully a |
||||
# (large) subset of Python module programmers will agree that the |
||||
# particular flavour of bondage and discipline provided by StrictVersion |
||||
# provides enough benefit to be worth using, and will submit their |
||||
# version numbering scheme to its domination. The free-thinking |
||||
# anarchists in the lot will never give in, though, and something needs |
||||
# to be done to accommodate them. |
||||
# |
||||
# Perhaps a "moderately strict" version class could be implemented that |
||||
# lets almost anything slide (syntactically), and makes some heuristic |
||||
# assumptions about non-digits in version number strings. This could |
||||
# sink into special-case-hell, though; if I was as talented and |
||||
# idiosyncratic as Larry Wall, I'd go ahead and implement a class that |
||||
# somehow knows that "1.2.1" < "1.2.2a2" < "1.2.2" < "1.2.2pl3", and is |
||||
# just as happy dealing with things like "2g6" and "1.13++". I don't |
||||
# think I'm smart enough to do it right though. |
||||
# |
||||
# In any case, I've coded the test suite for this module (see |
||||
# ../test/test_version.py) specifically to fail on things like comparing |
||||
# "1.2a2" and "1.2". That's not because the *code* is doing anything |
||||
# wrong, it's because the simple, obvious design doesn't match my |
||||
# complicated, hairy expectations for real-world version numbers. It |
||||
# would be a snap to fix the test suite to say, "Yep, LooseVersion does |
||||
# the Right Thing" (ie. the code matches the conception). But I'd rather |
||||
# have a conception that matches common notions about version numbers. |
||||
|
||||
class LooseVersion (Version): |
||||
|
||||
"""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 |
||||
3.1.1.6 |
||||
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"). |
||||
""" |
||||
|
||||
component_re = re.compile(r'(\d+ | [a-z]+ | \.)', re.VERBOSE) |
||||
|
||||
def __init__ (self, vstring=None): |
||||
if vstring: |
||||
self.parse(vstring) |
||||
|
||||
|
||||
def parse (self, vstring): |
||||
# I've given up on thinking I can reconstruct the version string |
||||
# from the parsed tuple -- so I just store the string here for |
||||
# use by __str__ |
||||
self.vstring = vstring |
||||
components = [x for x in self.component_re.split(vstring) |
||||
if x and x != '.'] |
||||
for i, obj in enumerate(components): |
||||
try: |
||||
components[i] = int(obj) |
||||
except ValueError: |
||||
pass |
||||
|
||||
self.version = components |
||||
|
||||
|
||||
def __str__ (self): |
||||
return self.vstring |
||||
|
||||
|
||||
def __repr__ (self): |
||||
return "LooseVersion ('%s')" % str(self) |
||||
|
||||
|
||||
def _cmp (self, other): |
||||
if isinstance(other, str): |
||||
other = LooseVersion(other) |
||||
elif not isinstance(other, LooseVersion): |
||||
return NotImplemented |
||||
|
||||
if self.version == other.version: |
||||
return 0 |
||||
if self.version < other.version: |
||||
return -1 |
||||
if self.version > other.version: |
||||
return 1 |
||||
|
||||
|
||||
# end class LooseVersion |
||||
Loading…
Reference in new issue