How can I Execute Python Functions Directly from the Command Line?

Invoking Python Functions from the Command Line

Python offers a convenient mechanism to execute functions directly from the terminal, allowing for rapid prototyping and testing without the need for a full-fledged program.

To run a function from the command line, you can use the -c (command) argument along with the path to the Python script containing the function. This argument specifies the code to be executed as a string. For instance, if your function is defined in a file named foo.py as:

def hello():
    return 'Hi :)'

You can execute it from the command line as follows:

$ python -c 'import foo; print foo.hello()'

Alternatively, you can import the module and directly access the function's namespace if namespace pollution is not a concern:

$ python -c 'from foo import *; print hello()'

For a more controlled approach, you can import only the specific function to be executed:

$ python -c 'from foo import hello; print hello()'

These methods provide flexibility in running Python functions efficiently and easily from the command line, making them particularly useful for quick debugging, testing, or executing one-time tasks.

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