[Python-de] Modul von anderswo laden?

Juergen Hermann jh at web.de
Fri Mar 8 15:53:57 EST 2002


On Fri, 8 Mar 2002 06:05:09 +0100, Matthias Urlichs wrote:

>Hallo,

Hi, Du lebst also auch noch, und verwendest jetzt sogar richtig 
Programmiersprachen. ;)

>(Killerargument für ein solches Feature: mit Perl geht es. ;-)

In Perl lässt sich auch völlig unlesbarer Code schreiben... go figure.

Ich blick zwar nicht genau,was Du machen möchtest, aber schau zum einen 
mal in das "xml" Package der Standarddistribution, und zu anderen kann Dir 
dies helfen (das ist aus dem "Pmw" Package):

# This file is executed when the Pmw package is imported.  It creates
# a lazy importer/dynamic loader for Pmw and replaces the Pmw module
# with it.  Even though the loader from the most recent installed
# version of Pmw is used, the user is able to specify which version of
# Pmw megawidgets to load by using the setversion() function of the
# loader.

# This is the only file in Pmw which is not part of a particular Pmw
# release.

import sys
import os
import re

def _hasLoader(dir):
    # Only accept Pmw_V_R_P with single digits, since ordering will
    # not work correctly with multiple digits (for example, Pmw_10_0
    # will be before Pmw_9_9).
    if re.search('^Pmw_[0-9]_[0-9](_[0-9])?$', dir) is not None:
        for suffix in ('.py', '.pyc', '.pyo'):
            path = os.path.join(_dir, dir, 'lib', 'PmwLoader' + suffix)
            if os.path.isfile(path):
                return 1
    return 0

# First get a list of all subdirectories containing versions of Pmw.
_dir = __path__[0]
_listdir = os.listdir(_dir)
_instdirs = filter(_hasLoader, _listdir)
_instdirs.sort()
_instdirs.reverse()

# Using the latest version import the dynamic loader.
_loader = 'Pmw.' + _instdirs[0] + '.lib.PmwLoader'
__import__(_loader)
_mod = sys.modules[_loader]

# Create the dynamic loader and install it into sys.modules.
sys.modules['_Pmw'] = sys.modules['Pmw']
sys.modules['Pmw'] = _mod.PmwLoader(_dir, _instdirs, _listdir)


Ciao, Jürgen





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