Re: PYTHONPATH var
On Fri, 29 May 2009 03:50:54 -0700, insfor wrote: Hi guys. I have a question regarding runtime definition of the variable PYTHONPATH. Do you know how without modifying of source code change the value for this var. Syntax error: sentence seems to be a question, but is missing a question mark. To answer your question, PYTHONPATH is an environment variable. You set it in your shell. For example, I use the bash shell under Linux, and in my .bashrc file I have this line: export PYTHONPATH=/home/steve/python/ Every time I log in, the shell sets the environment variable to the pathname /home/steve/python/, and then when Python runs, it appends that path to sys.path. I don't have to modify any Python source code. Value stores in the system var sys.path, but the first item of this list, path[0], is the directory containing the script that was used to invoke the Python interpreter. We need to change this value which allows to us import scripts first from directory containing newest hotfix scripts without replacing original project scripts. One of the variant is to create script which will modify this var and insert line with import this script into each project script. So the question does another way exist? For example, parameter or argument for python launcher. I don't understand what you are actually trying to say here. Perhaps you can explain a little bit more carefully? However, trying to guess what you want, PYTHONPATH doesn't *replace* sys.path, it appends to the end of it. This is usually the right thing to do. However, sys.path is an ordinary list. If you want to modify it, you can do so: import sys sys.path[0] = '/some/other/path' -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: PYTHONPATH var
Sergey Dikovitsky wrote: Hi guys. I have a question regarding runtime definition of the variable PYTHONPATH. Do you know how without modifying of source code change the value for this var. Value stores in the system var sys.path, but the first item of this list, path[0], is the directory containing the script that was used to invoke the Python interpreter. We need to change this value which allows to us import scripts first from directory containing newest hotfix scripts without replacing original project scripts. One of the variant is to create script which will modify this var and insert line with import this script into each project script. So the question does another way exist? For example, parameter or argument for python launcher. I have to guess much of what you're talking about. So if this is way off, try responding with a clearer wording. PYTHONPATH is an environment variable. You change that using your operating system's scripting language (shell script). But you're talking about changing the first entry in sys.path, a Python list, which is generated from PYTHONPATH and a few other sources. So it must be changed as Python is starting, not in the shell. It is an ordinary list, and may be changed in the usual way. So a script could start with: import sys sys.path = [newpath] + sys.path (although you'd probably want to use a variable, not a literal) But you say without modifying of source code. Not clear what that means, without you qualifying just which source code is sacrosanct. It seems you're trying to change the search order for the initial script. But there is no search order. You give an actual filename to the interpreter, and it does not search at all. So perhaps what you really want is to modify the PATH variable before running the script. Then the operating system will search for it before trying to execute it. This should work as long as you don't need any other switches on the python.exe command line. You need to specify your system environment (Windows, Linux, ...), and probably your Python version. And make it clearer what your real goal is. -- http://mail.python.org/mailman/listinfo/python-list
