How Do I Modify PYTHONPATH on Windows to Access Modules from Custom Directories?

Modifying PYTHONPATH in Windows

In Windows, modifying the PYTHONPATH environment variable allows you to access modules and packages located in specific directories without specifying their full paths.

To add a directory to your PYTHONPATH, follow these steps:

1. Open the Windows Control Panel.
2. Navigate to "System and Security" > "System" > "Advanced system settings."
3. In the "System Properties" dialog box, select the "Environment Variables" button under the "Advanced" tab.
4. Under "User variables," locate the "PYTHONPATH" variable or create a new one.
5. Edit the variable's "Value" field and add the path to the directory you want to add (e.g., "C:My_Projects").
6. Separate multiple paths with semicolons (;).

However, this may not work as expected. To ensure proper functionality, you may need to:

• Add the Python installation directory to the system path (e.g., "C:Python27").

• Create a new "PythonPath" system variable with the following paths:

  • "C:Python27Lib"
  • "C:Python27DLLs"
  • "C:Python27Liblib-tk"

• Additionally, append the following path to the "PythonPath" system variable:

  • "C:Python27;"

These modifications should allow you to access modules and packages in the specified directory directly. Remember to restart any active Python environments or terminals to reflect the changes.

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