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POResolving Python package version conflict in Reddit install
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copied!<p>I'm trying to get the Python libraries for Reddit installed on my Mac. I want to run them using PyCharm for development as I like it as a Python IDE.</p> <p>I'm running the Cassandra, Memcached, RabbitMQ, and Postgres servers inside a Virtual Box instance that is accessible via the Virtual Box Host-only adapter. This is working as I can start Reddit in the Virtual Box and access it from my Mac just fine.</p> <p>When running the paster script to see if the Reddit Python source install is working on the Mac. I get the following error:</p> <pre><code> Traceback (most recent call last): File "/Users/inflector/software/new-day/reddit/dev/bin/paster", line 8, in <module> load_entry_point('PasteScript==1.7.5', 'console_scripts', 'paster')() File "/Users/inflector/software/new-day/reddit/dev/lib/python2.7/site-packages/paste/script/command.py", line 93, in run commands = get_commands() File "/Users/inflector/software/new-day/reddit/dev/lib/python2.7/site-packages/paste/script/command.py", line 135, in get_commands plugins = pluginlib.resolve_plugins(plugins) File "/Users/inflector/software/new-day/reddit/dev/lib/python2.7/site-packages/paste/script/pluginlib.py", line 82, in resolve_plugins pkg_resources.require(plugin) File "build/bdist.linux-i686/egg/pkg_resources.py", line 666, in require File "build/bdist.linux-i686/egg/pkg_resources.py", line 569, in resolve pkg_resources.VersionConflict: (WebOb 1.2.3 (/Users/inflector/software/new-day/reddit/dev/lib/python2.7/site-packages), Requirement.parse('webob==1.0.8')) </code></pre> <p>If I downgrade the installation to WebOb 1.0.8, I get the reverse, it wants 'WebOb>=1.2'.</p> <p>'pip list' shows these packages installed:</p> <pre><code>amqplib (1.0.2) Babel (0.9.6) bcrypt (1.0.2) Beaker (1.6.4) BeautifulSoup (3.2.1) beautifulsoup4 (4.2.1) boto (2.9.5) cffi (0.6) chardet (2.1.1) crypto (1.1.0) cssutils (0.9.5.1) Cython (0.19.1) decorator (3.4.0) FormEncode (1.2.6) kazoo (1.1) l2cs (2.0.2) lxml (3.2.1) Mako (0.8.1) MarkupSafe (0.18) nose (1.3.0) Paste (1.7.5.1) PasteDeploy (1.5.0) PasteScript (1.7.5) PIL (1.1.7) psycopg2 (2.5) py-bcrypt (0.3) pyasn1 (0.1.7) PyCAPTCHA (0.4) pycassa (1.9.0) pycountry (0.14.8) pycparser (2.09.1) pycrypto (2.6) Pygments (1.6) pylibmc (1.2.3) Pylons (0.9.7) pytz (2013b) repoze.lru (0.6) requests (1.2.3) Routes (1.11) rsa (3.1.1) simplejson (3.3.0) six (1.3.0) snudown (1.1.5) SQLAlchemy (0.7.4) stripe (1.9.1) Tempita (0.5.1) thrift (0.9.0) waitress (0.8.5) WebError (0.10.3) WebHelpers (1.3) WebOb (1.2.3) WebTest (2.0.6) Whoosh (2.4.1) wsgiref (0.1.2) zope.interface (4.0.5) </code></pre> <p>My hypothesis is that at least one of these packages requires WebOb==1.0.8 and at least one other requires WebOb>=1.2</p> <p>I've setup a virtualenv for the Reddit install and set it up with the --no-site-packages option so that I'm only dealing with the packages I need for Reddit. I manually installed everything that I think I need. So this is actually the minimum set of packages. I need each of them, but perhaps not all of them are the correct versions. The Reddit installer doesn't specify versions for every package, only some of them.</p> <p>So how do I track down these dependencies? How do I get a list of the requirements for each of the packages installed in the virtualenv?</p> <p>And where is the file: "build/bdist.linux-i686/egg/pkg_resources.py" coming from? I can't find it anywhere in my system. And the Mac is not linux so this seems odd.</p> <p>I'm a very experienced programmer, C++, Java, Object Pascal, Objective C, etc. but not an expert Python programmer yet. So the Python package system is too much of a black box to me at this point. I can use pip and run setup.py scripts but I don't yet grok them.</p>

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