I am new to Python, but I have experience in other OOP languages. My course does not explain the main method in python. Please tell me how main method works in python ? I am confused because I am
For questions where someone simply hasn't called any functions, or incorrectly expects a function named main to be used as an entry point automatically, use Why doesn't the main () function run when I start a Python script? Where does the script start running?.
Python runs scripts from top to bottom. def is a statement, and it executes when it is encountered, just like any other statement. However, the effect of this is to create the function (and assign it a name), not to call it.
What is best practice to define a main function and entry point for a script/module that may be used started as main, but not always? Here's how I've been doing it in the past, similar to realpytho...
I always write a main() function (appropriately named), and put nothing but command-line parsing and a call to main() in the if __name__ == '__main__' block. That's because no matter how silly, trivial, or single-purpose I originally expect that script to be, I always end up wanting to call it from another module at some later date. Either I take the time to make it an importable module today ...
The OP clearly states he knows what the guard is doing and why we're using it - "This prevents executing statements when you want to import this module into another program." -, what he asks is why putting the main code in a function instead of having it directly under the guard. I definitly don't see how this is a dup.
212 What is the __main__.py file for? When creating a Python module, it is common to make the module execute some functionality (usually contained in a main function) when run as the entry point of the program. This is typically done with the following common idiom placed at the bottom of most Python files:
Easier to call the "main" function from another script - If you practice this often enough developing packages comes much more natural. But modularity is definitely the biggest thing here, being able to call code from other programs, tie in multiple scripts, etc.
The main content needs to be wrapped in an asynchronous function to give the indented async function time to run. The intended async function runs while the main thread is waiting so downtime must be introduced in the main function.
