python-module

Suppose I have two versions of a python package, say "lib". One is in folder ~/version1/lib and the other is in ~/version2/lib . I'm trying to load both packages in one session by doing this: sys.path.insert(0, '~/version1') import lib as a sys.path.insert(0, '~/version2') import lib as b But it doesn't work, because of cache, b will be the same as a . Is there anyway to do it? Maybe use hook in sys.meta_path ? I didn't figure it out. Or is there anyway to delete cache of imported modules? You can consider using python virtual environment . Activate the required environment and run your code

Using importlib , what is the difference between "Meta Path Finder" (found by traversing over sys.meta_path) and Path Entry Finder" (found by traversing over sys.path_hooks)? The first type is called upon begin of an import, but when is the second type used? Do both return a spec object? I want to implement a customized import, where a module can be imported from sources other than *.py or *.pyc, e.g. from a stream. How can this be done? Mr_and_Mrs_D sys.path_hooks returns a finder factory . Path hooks are called as part of sys.path (or package.__path__ ) processing as we read in PEP 302

I have several project directories and want to have libraries/modules that are specific to them. For instance, I might have a directory structure like such: myproject/ mymodules/ __init__.py myfunctions.py myreports/ mycode.py Assuming there is a function called add in myfunctions.py , I can call it from mycode.py with the most naive routine: execfile('../mymodules/myfunctions.py') add(1,2) But to be more sophisticated about it, I can also do import sys sys.path.append('../mymodules') import myfunctions myfunctions.add(1,2) Is this the most idiomatic way to do this? There is also some mention

I'm trying to use alembic which is an sqlalchemy tool in python. You type a command and it generates a folder "alembic" with py files inside. The py file inside, needs to link to my application in a separate folder called "myapp". But I cannot link it. It says it doesn't exist and relative import doesn't work. so I need to import my config class from myapp/configs/config.py file. /apps +--/alembic |----env.py <--- the calling file +--/myapp |----configs/__init__.py <--- has "DefaultConfig" class imported |----configs/config.py <--- I want to import the class inside here. inside env.py: from

When installing a package via sudo pip-python (CentOS 6 package: python-pip-0.8-1.el6.noarch ), I sometimes get permission issues with the installed packages being readable only by root. Re-installing again one or two times usually fixes the problem. Has anyone experienced this? Or can anyone suggest any troubleshooting steps to nail down the cause? When you run a command using sudo , it will preserve the users umask . pip just installs files, it doesn't change access rights, so you'll end up with the files having the access rights set conforming to the current user's umask, which may be owner

I have a bunch of Python modules I want to clean up, reorganize and refactor (there's some duplicate code, some unused code ...), and I'm wondering if there's a tool to make a map of which module uses which other module. Ideally, I'd like a map like this: main.py -> task_runner.py -> task_utils.py -> deserialization.py -> file_utils.py -> server.py -> (deserialization.py) -> db_access.py checkup_script.py re_test.py main_bkp0.py unit_tests.py ... so that I could tell which files I can start moving around first (file_utils.py, db_access.py), which files are not used by my main.py and so could