In Python 2.5, I import modules by changing environment variables. It works, but using site-packages does not. Is there another way to import modules in directories other than C:\Python25 ?
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What does "using site-packages does not" mean? What code are you using? What error are you getting? What -- specifically -- is happening?S.Lott– S.Lott2009-03-30 14:00:05 +00:00Commented Mar 30, 2009 at 14:00
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@S.Lott: 39 questions and you haven't get used to him yet?SilentGhost– SilentGhost2009-03-30 14:01:58 +00:00Commented Mar 30, 2009 at 14:01
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@SilentGhost: My default assumption is that people -- eventually -- learn something. Statistically, this appears to be a case where learning does not appear to be happening.S.Lott– S.Lott2009-03-30 14:20:28 +00:00Commented Mar 30, 2009 at 14:20
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@S.Lott: if you haven't noticed, there is a group of users that have 0 answers, but dozens of poorly-worded questions. My feeling is that they use this community to do their jobs. Dishonesty is always more probable than limited mental abilities, that's what Heinlein taught me ;)SilentGhost– SilentGhost2009-03-30 14:26:07 +00:00Commented Mar 30, 2009 at 14:26
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@SilentGhost: Just responding to the dishonesty comment. The stuff is hard if you don't know what you are doing. I often find that authors will leave out very basic things in tutorials assuming that the base knowledge is a given. I think that leads to a lot of overly simplified poorly represented questions. Also, I highly recommend Heinlein to anyone who can read.JoeM05– JoeM052010-12-16 16:47:52 +00:00Commented Dec 16, 2010 at 16:47
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4 Answers
On way is with PYTHONPATH environment variable. Other one is to add path to sys.path either directly by sys.path.append(path) or by defining .pth files and add them to with site.addsitedir(dirWithPths). Path files (.pth) are simple text files with a path in each line. Every .pth file in dirWithPths will be read.
3 Comments
user46646
its not working . site.addsitedir(dirWithPths) is returning None Can you help me?
vartec
¿What do you expect it to return? It just adds paths to sys.path.
Qiang Xu
Looks a .pth file is good enough to let python search for the module. No need to use
site.addsitedir(dirWithPths), which is only necessary if you want to put the .pth file in some non-default importing directory that python is looking into.Append the location to the module to sys.path.
Edit: (to counter the post below ;-) )
os.path does something completely different. You need to use sys.path.
sys.path.append("/home/me/local/modules")
4 Comments
SilentGhost
os.path.append doesn't do anything completely different except raising AttributeError
wzzrd
not sure what I said to offend you there, but there was no ill intent.
wzzrd
omg. I was so wondering about being offensive, I missed the 'being stupid' part. Sorry about that. It was a very poor formulated comment, so I'll just remove it so it'll cause no further harm :-)
Directories added to the PYTHONPATH environment variable are searched after site-packages, so if you have a module in site-packages with the same name as the module you want from your PYTHONPATH, the site-packages version will win. Also, you may need to restart your interpreter and the shell that launched it for the change to the environment variable to take effect.
If you want to add a directory to the search path at run time, without restarting your program, add the directory to sys.path. For example:
import sys
sys.path.append(newpath)
If you want your new directory to be searched before site-packages, put the directory at the front of the list, like this:
import sys
sys.path.insert(0, newpath)
Comments
sys.path is a list to which you can append custom paths to search like this:
sys.path.append("/home/foo")
1 Comment
Andrew Hare
Fixed - the amazing thing was that I typed "os.path" twice and didn't notice.