How to Execute Python Scripts from Any Directory?

Running Python Scripts from the Command Line:

When attempting to execute a Python script without navigating to its directory, one may encounter the error "No such file or directory." This is because the current working directory is not included in the Python search path.

The Role of PYTHONPATH:

Contrary to its name, PYTHONPATH does not control the execution of scripts. Instead, it specifies the path where Python searches for imported modules.

Modifying the Path Variable:

To execute scripts from any directory, the PATH environment variable must be modified. This variable stores a list of directories where the shell searches for executable programs.

Proper Shebang and Execution Privileges:

To ensure proper execution, a shebang line must be added to the first line of the Python script. This line specifies the Python interpreter to use. Additionally, the script must be marked as executable using the chmod command.

Example:

Consider the following example:

#!/usr/bin/env python
import your_module

print("Hello from Python!")

To make this script executable from anywhere:

1. Add the directory containing the script to the PATH variable:

   export PATH=$PATH:/home/randy/lib/python

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2. Mark the script as executable:

   chmod +x /home/randy/lib/python/your_script.py

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This configuration will allow the script to be executed by simply typing your_script.py from any directory in the console.

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