"""
If you have more than one version of wxPython installed this module
allows your application to choose which version of wxPython will be
-imported when it does 'import wx'. You use it like this:
+imported when it does 'import wx'. The main function of this module
+is `select` and you use it like this::
import wxversion
- wxversion.require('2.4')
+ wxversion.select('2.4')
import wx
+Or additional build options can also be selected, although they will
+not be required if they are not installed, like this::
+
+ import wxversion
+ wxversion.select('2.5.3-unicode')
+ import wx
+
+Or you can require an exact match on the build options like this::
+
+ import wxversion
+ wxversion.select('2.5.3-unicode', optionsRequired=True)
+ import wx
+
+Finally you can also specify a collection of versions that are allowed
+by your application, like this::
+
+ import wxversion
+ wxversion.select(['2.5.4', '2.5.5', '2.6'])
+ import wx
+
+
Of course the default wxPython version can also be controlled by
setting PYTHONPATH or by editing the wx.pth path configuration file,
but using wxversion will allow an application to manage the version
environment correctly.
It works by searching the sys.path for directories matching wx-* and
-then comparing them to what was passed to the require function. If a
+then comparing them to what was passed to the select function. If a
match is found then that path is inserted into sys.path.
+
+NOTE: If you are making a 'bundle' of your application with a tool
+like py2exe then you should *not* use the wxversion module since it
+looks at the filesystem for the directories on sys.path, it will fail
+in a bundled environment. Instead you should simply ensure that the
+version of wxPython that you want is found by default on the sys.path
+when making the bundled version by setting PYTHONPATH. Then that
+version will be included in your bundle and your app will work as
+expected. Py2exe and the others usually have a way to tell at runtime
+if they are running from a bundle or running raw, so you can check
+that and only use wxversion if needed. For example, for py2exe::
+
+ if not hasattr(sys, 'frozen'):
+ import wxversion
+ wxversion.select('2.5')
+ import wx
+
+More documentation on wxversion and multi-version installs can be
+found at: http://wiki.wxpython.org/index.cgi/MultiVersionInstalls
+
"""
import sys, os, glob, fnmatch
+_selected = None
+class VersionError(Exception):
+ pass
+#----------------------------------------------------------------------
-def require(versions):
+def select(versions, optionsRequired=False):
"""
- Search for a wxPython installation that matches version.
-
- :param version: Specifies the version to look for, it can either be
- a sting or a list of strings. Each string is
- compared to the installed wxPythons and the best
- match is added to the sys.path, allowing an 'import
- wx' to find that version.
-
- The version string is composed of the dotted
- version number (at least 2 of the 4 components)
- optionally followed by hyphen ('-') separated
- options (wx port, unicode/ansi, flavour, etc.) A
- match is determined by how much of the installed
- version matches what is given in the version
- parameter. If the version number components don't
- match then the score is zero, otherwise the score
- is increased for every specified optional component
- that is specified and that matches.
+ Search for a wxPython installation that matches version. If one
+ is found then sys.path is modified so that version will be
+ imported with a 'import wx', otherwise a VersionError exception is
+ raised. This funciton should only be caled once at the begining
+ of the application before wxPython is imported.
+
+ :param versions: Specifies the version to look for, it can
+ either be a string or a list of strings. Each string is
+ compared to the installed wxPythons and the best match is
+ inserted into the sys.path, allowing an 'import wx' to
+ find that version.
+
+ The version string is composed of the dotted version
+ number (at least 2 of the 4 components) optionally
+ followed by hyphen ('-') separated options (wx port,
+ unicode/ansi, flavour, etc.) A match is determined by how
+ much of the installed version matches what is given in the
+ version parameter. If the version number components don't
+ match then the score is zero, otherwise the score is
+ increased for every specified optional component that is
+ specified and that matches.
+
+ Please note, however, that it is possible for a match to
+ be selected that doesn't exactly match the versions
+ requested. The only component that is required to be
+ matched is the version number. If you need to require a
+ match on the other components as well, then please use the
+ optional ``optionsRequired`` parameter described next.
+
+ :param optionsRequired: Allows you to specify that the other
+ components of the version string (such as the port name
+ or character type) are also required to be present for an
+ installed version to be considered a match. Using this
+ parameter allows you to change the selection from a soft,
+ as close as possible match to a hard, exact match.
+
"""
- assert not sys.modules.has_key('wx') and not sys.modules.has_key('wxPython'), \
- "wxversion.require() must be called before wxPython is imported"
+ if type(versions) == str:
+ versions = [versions]
+
+ global _selected
+ if _selected is not None:
+ # A version was previously selected, ensure that it matches
+ # this new request
+ for ver in versions:
+ if _selected.Score(_wxPackageInfo(ver), optionsRequired) > 0:
+ return
+ # otherwise, raise an exception
+ raise VersionError("A previously selected wx version does not match the new request.")
+
+ # If we get here then this is the first time wxversion is used,
+ # ensure that wxPython hasn't been imported yet.
+ if sys.modules.has_key('wx') or sys.modules.has_key('wxPython'):
+ raise VersionError("wxversion.select() must be called before wxPython is imported")
+
+ # Look for a matching version and manipulate the sys.path as
+ # needed to allow it to be imported.
+ installed = _find_installed(True)
+ bestMatch = _get_best_match(installed, versions, optionsRequired)
+
+ if bestMatch is None:
+ raise VersionError("Requested version of wxPython not found")
+
+ sys.path.insert(0, bestMatch.pathname)
+ _selected = bestMatch
+
+#----------------------------------------------------------------------
+
+UPDATE_URL = "http://wxPython.org/"
+#UPDATE_URL = "http://sourceforge.net/project/showfiles.php?group_id=10718"
+
+_EM_DEBUG=0
+
+def ensureMinimal(minVersion, optionsRequired=False):
+ """
+ Checks to see if the default version of wxPython is greater-than
+ or equal to `minVersion`. If not then it will try to find an
+ installed version that is >= minVersion. If none are available
+ then a message is displayed that will inform the user and will
+ offer to open their web browser to the wxPython downloads page,
+ and will then exit the application.
+ """
+ assert type(minVersion) == str
+
+ # ensure that wxPython hasn't been imported yet.
+ if sys.modules.has_key('wx') or sys.modules.has_key('wxPython'):
+ raise VersionError("wxversion.ensureMinimal() must be called before wxPython is imported")
bestMatch = None
- bestScore = 0
+ minv = _wxPackageInfo(minVersion)
+
+ # check the default version first
+ defaultPath = _find_default()
+ if defaultPath:
+ defv = _wxPackageInfo(defaultPath, True)
+ if defv >= minv and minv.CheckOptions(defv, optionsRequired):
+ bestMatch = defv
+
+ # if still no match then check look at all installed versions
+ if bestMatch is None:
+ installed = _find_installed()
+ # The list is in reverse sorted order, so find the first
+ # one that is big enough and optionally matches the
+ # options
+ for inst in installed:
+ if inst >= minv and minv.CheckOptions(inst, optionsRequired):
+ bestMatch = inst
+ break
+
+ # if still no match then prompt the user
+ if bestMatch is None:
+ if _EM_DEBUG: # We'll do it this way just for the test code below
+ raise VersionError("Requested version of wxPython not found")
+
+ import wx, webbrowser
+ versions = "\n".join([" "+ver for ver in getInstalled()])
+ app = wx.PySimpleApp()
+ result = wx.MessageBox("This application requires a version of wxPython "
+ "greater than or equal to %s, but a matching version "
+ "was not found.\n\n"
+ "You currently have these version(s) installed:\n%s\n\n"
+ "Would you like to download a new version of wxPython?\n"
+ % (minVersion, versions),
+ "wxPython Upgrade Needed", style=wx.YES_NO)
+ if result == wx.YES:
+ webbrowser.open(UPDATE_URL)
+ app.MainLoop()
+ sys.exit()
+
+ sys.path.insert(0, bestMatch.pathname)
+ global _selected
+ _selected = bestMatch
+
+
+#----------------------------------------------------------------------
+
+def checkInstalled(versions, optionsRequired=False):
+ """
+ Check if there is a version of wxPython installed that matches one
+ of the versions given. Returns True if so, False if not. This
+ can be used to determine if calling `select` will succeed or not.
+
+ :param versions: Same as in `select`, either a string or a list
+ of strings specifying the version(s) to check for.
+
+ :param optionsRequired: Same as in `select`.
+ """
+
if type(versions) == str:
versions = [versions]
-
- packages = _find_installed()
- for pkg in packages:
+ installed = _find_installed()
+ bestMatch = _get_best_match(installed, versions, optionsRequired)
+ return bestMatch is not None
+
+#----------------------------------------------------------------------
+
+def getInstalled():
+ """
+ Returns a list of strings representing the installed wxPython
+ versions that are found on the system.
+ """
+ installed = _find_installed()
+ return [os.path.basename(p.pathname)[3:] for p in installed]
+
+
+
+#----------------------------------------------------------------------
+# private helpers...
+
+def _get_best_match(installed, versions, optionsRequired):
+ bestMatch = None
+ bestScore = 0
+ for pkg in installed:
for ver in versions:
- score = pkg.Score(_wxPackageInfo(ver))
+ score = pkg.Score(_wxPackageInfo(ver), optionsRequired)
if score > bestScore:
bestMatch = pkg
bestScore = score
-
- assert bestMatch is not None, \
- "Required version of wxPython not found"
-
- sys.path.insert(0, bestMatch.pathname)
-
-
+ return bestMatch
_pattern = "wx-[0-9].*"
-def _find_installed():
+def _find_installed(removeExisting=False):
installed = []
+ toRemove = []
for pth in sys.path:
# empty means to look in the current dir
base = os.path.basename(pth)
- # if it's a wx path that's already in the sys.path then skip it
+ # if it's a wx path that's already in the sys.path then mark
+ # it for removal and then skip it
if fnmatch.fnmatchcase(base, _pattern):
+ toRemove.append(pth)
continue
# now look in the dir for matching subdirs
continue
installed.append(_wxPackageInfo(name, True))
+ if removeExisting:
+ for rem in toRemove:
+ del sys.path[sys.path.index(rem)]
+
installed.sort()
installed.reverse()
return installed
+# Scan the sys.path looking for either a directory matching _pattern,
+# or a wx.pth file
+def _find_default():
+ for pth in sys.path:
+ # empty means to look in the current dir
+ if not pth:
+ pth = '.'
+
+ # skip it if it's not a package dir
+ if not os.path.isdir(pth):
+ continue
+
+ # does it match the pattern?
+ base = os.path.basename(pth)
+ if fnmatch.fnmatchcase(base, _pattern):
+ return pth
+
+ for pth in sys.path:
+ if not pth:
+ pth = '.'
+ if not os.path.isdir(pth):
+ continue
+ if os.path.exists(os.path.join(pth, 'wx.pth')):
+ base = open(os.path.join(pth, 'wx.pth')).read()
+ return os.path.join(pth, base)
+
+ return None
+
+
class _wxPackageInfo(object):
def __init__(self, pathname, stripFirst=False):
self.pathname = pathname
self.options = segments[1:]
- def Score(self, other):
+ def Score(self, other, optionsRequired):
score = 0
- # whatever version components given in other must match exactly
- if len(self.version) > len(other.version):
- v = self.version[:len(other.version)]
- else:
- v = self.version
- if v != other.version:
- return 0
+
+ # whatever number of version components given in other must
+ # match exactly
+ minlen = min(len(self.version), len(other.version))
+ if self.version[:minlen] != other.version[:minlen]:
+ return 0
score += 1
+
+ # check for matching options, if optionsRequired then the
+ # options are not optional ;-)
for opt in other.options:
if opt in self.options:
score += 1
+ elif optionsRequired:
+ return 0
+
return score
-
- # TODO: factor self.options into the sort order?
+
+ def CheckOptions(self, other, optionsRequired):
+ # if options are not required then this always succeeds
+ if not optionsRequired:
+ return True
+ # otherwise, if we have any option not present in other, then
+ # the match fails.
+ for opt in self.options:
+ if opt not in other.options:
+ return False
+ return True
+
+
+
def __lt__(self, other):
- return self.version < other.version
+ return self.version < other.version or \
+ (self.version == other.version and self.options < other.options)
+ def __le__(self, other):
+ return self.version <= other.version or \
+ (self.version == other.version and self.options <= other.options)
+
def __gt__(self, other):
- return self.version > other.version
+ return self.version > other.version or \
+ (self.version == other.version and self.options > other.options)
+ def __ge__(self, other):
+ return self.version >= other.version or \
+ (self.version == other.version and self.options >= other.options)
+
def __eq__(self, other):
- return self.version == other.version
+ return self.version == other.version and self.options == other.options
-
+#----------------------------------------------------------------------
if __name__ == '__main__':
- def test(version):
+ import pprint
+
+ #ensureMinimal('2.5')
+ #pprint.pprint(sys.path)
+ #sys.exit()
+
+
+ def test(version, optionsRequired=False):
+ # setup
+ savepath = sys.path[:]
+
+ #test
+ select(version, optionsRequired)
+ print "Asked for %s, (%s):\t got: %s" % (version, optionsRequired, sys.path[0])
+
+ # reset
+ sys.path = savepath[:]
+ global _selected
+ _selected = None
+
+
+ def testEM(version, optionsRequired=False):
+ # setup
savepath = sys.path[:]
- require(version)
- print "Asked for %s:\t got: %s" % (version, sys.path[0])
+
+ #test
+ ensureMinimal(version, optionsRequired)
+ print "EM: Asked for %s, (%s):\t got: %s" % (version, optionsRequired, sys.path[0])
+
+ # reset
sys.path = savepath[:]
+ global _selected
+ _selected = None
# make some test dirs
- names = ['wx-2.4',
- 'wx-2.5.2',
- 'wx-2.5.2.9-gtk2-unicode',
- 'wx-2.5.2.9-gtk-ansi',
- 'wx-2.5.1',
- 'wx-2.5.2.8-gtk2-unicode',
- 'wx-2.5.3']
+ names = ['wx-2.4-gtk-ansi',
+ 'wx-2.5.2-gtk2-unicode',
+ 'wx-2.5.3-gtk-ansi',
+ 'wx-2.6-gtk2-unicode',
+ 'wx-2.6-gtk2-ansi',
+ 'wx-2.6-gtk-ansi',
+ 'wx-2.7.1-gtk2-ansi',
+ ]
for name in names:
d = os.path.join('/tmp', name)
os.mkdir(d)
# now run some tests
+ pprint.pprint( getInstalled())
+ print checkInstalled("2.4")
+ print checkInstalled("2.5-unicode")
+ print checkInstalled("2.99-bogus")
+ print "Current sys.path:"
+ pprint.pprint(sys.path)
+ print
+
test("2.4")
test("2.5")
test("2.5-gtk2")
test("2.5.2")
test("2.5-ansi")
test("2.5-unicode")
+ test("2.6")
+ test("2.6-ansi")
+ test(["2.6-unicode", "2.7-unicode"])
+ test(["2.6", "2.7"])
+ test(["2.6-unicode", "2.7-unicode"], optionsRequired=True)
+
+
# There isn't a unicode match for this one, but it will give the best
# available 2.4. Should it give an error instead? I don't think so...
test("2.4-unicode")
+ # Try asking for multiple versions
+ test(["2.5.2", "2.5.3", "2.6"])
+
try:
# expecting an error on this one
- test("2.6")
- except AssertionError:
- print "Asked for 2.6:\t got: Assertion"
+ test("2.9")
+ except VersionError, e:
+ print "Asked for 2.9:\t got Exception:", e
- # Try asking for multiple versions
- test(["2.6", "2.5.3", "2.5.2-gtk2"])
+ # check for exception when incompatible versions are requested
+ try:
+ select("2.4")
+ select("2.5")
+ except VersionError, e:
+ print "Asked for incompatible versions, got Exception:", e
+
+ _EM_DEBUG=1
+ testEM("2.6")
+ testEM("2.6-unicode")
+ testEM("2.6-unicode", True)
+ try:
+ testEM("2.9")
+ except VersionError, e:
+ print "EM: Asked for 2.9:\t got Exception:", e
# cleanup
for name in names:
projects / wxWidgets.git / blobdiff