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Comments on How and where does Python code start running? How can I control that?

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How and where does Python code start running? How can I control that?

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Suppose I have some code in a file myscript.py like:

def my_function():
    print("Test")

What steps do I need to take in order to make my_function run? That is to say: how do I get Python to run myscript.py; and from there, how do I choose my_function as the starting point for the code? In particular, do I need to use a specific name for my starting function (such as main, as seen in some other programming languages)?

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1 comment thread

Background and intended scope (2 comments)
Background and intended scope
Karl Knechtel‭ wrote 2 months ago

This question is intended as a canonical that gathers the important, overlapping ideas from several Stack Overflow questions. The goal is to create a clear overview of Python's model for starting the execution of code.

The question is notably not about:

  • importing code (except to the extent that the initially run script file is loaded by a process similar to importing);
  • managing multiple versions of Python (e.g. controlling which installation python, python3 etc. refer to);
  • understanding the Python Launcher for Windows (beyond what's necessary to understand running a Python script);
  • understanding or dealing with virtual environments (except insofar as they impact the launch process);
  • Windows 10's wrapper program that promotes installing Python from the Microsoft Store.