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Title: Defining Main Functions in Python: Overview (Video) – Real Python

Open Graph Title: Defining Main Functions in Python: Overview – Real Python

Description: Hi, I’m Rich Bibby with realpython.com. Many programming languages have a special function that is automatically executed when an operating system starts to run a program. This function is usually called main() and must have a specific return type…

Open Graph Description: Hi, I’m Rich Bibby with realpython.com. Many programming languages have a special function that is automatically executed when an operating system starts to run a program. This function is usually called main() and must have a specific return type…

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Defining Main Functions in Pythonhttps://realpython.com/courses/python-main-function/
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00:00https://realpython.com/courses/python-main-function/continue/#t=0.51
Hi, I’m Rich Bibby with realpython.com.https://realpython.com/courses/python-main-function/continue/#t=0.51
Many programming languages have a special function that is automaticallyhttps://realpython.com/courses/python-main-function/continue/#t=3.33
executed when an operating system starts to run a program.https://realpython.com/courses/python-main-function/continue/#t=6.96
00:10https://realpython.com/courses/python-main-function/continue/#t=10.65
This function is usually called main() and must have a specific returnhttps://realpython.com/courses/python-main-function/continue/#t=10.65
type and arguments according to the language standard.https://realpython.com/courses/python-main-function/continue/#t=14.85
On the other hand,https://realpython.com/courses/python-main-function/continue/#t=17.994
the Python interpreter executes scripts starting at the top of the file,https://realpython.com/courses/python-main-function/continue/#t=19.38
and there is no specific function that Python automatically executes.https://realpython.com/courses/python-main-function/continue/#t=23.82
00:28https://realpython.com/courses/python-main-function/continue/#t=28.41
Nevertheless,https://realpython.com/courses/python-main-function/continue/#t=28.41
having a defined starting point for the execution of a program is useful forhttps://realpython.com/courses/python-main-function/continue/#t=29.34
understanding how a program works.https://realpython.com/courses/python-main-function/continue/#t=33.93
Python programmers have come up with several conventions to define this startinghttps://realpython.com/courses/python-main-function/continue/#t=36.3
point.https://realpython.com/courses/python-main-function/continue/#t=40.56
00:41https://realpython.com/courses/python-main-function/continue/#t=41.114
By the end of this tutorial,https://realpython.com/courses/python-main-function/continue/#t=41.114
you’ll understand what this special __name__ variable is and how Python defines it,https://realpython.com/courses/python-main-function/continue/#t=43.41
why you would want to use a main() function in Python,https://realpython.com/courses/python-main-function/continue/#t=48.48
what conventions there are for defining main() in Python, and what the best practiceshttps://realpython.com/courses/python-main-function/continue/#t=51.9
are for what code to put into your main() functions.https://realpython.com/courses/python-main-function/continue/#t=57.18
01:01https://realpython.com/courses/python-main-function/continue/#t=61.05
So, let’s get started.https://realpython.com/courses/python-main-function/continue/#t=61.05
In some Python scripts,https://realpython.com/courses/python-main-function/continue/#t=62.87
you may see a function definition and a conditional statement that looks likehttps://realpython.com/courses/python-main-function/continue/#t=64.769
this.https://realpython.com/courses/python-main-function/continue/#t=68.67
In this code, there is a function called main() that prints the phrasehttps://realpython.com/courses/python-main-function/continue/#t=68.954
"Hello World!" when the Python interpreter executes it.https://realpython.com/courses/python-main-function/continue/#t=72.93
01:16https://realpython.com/courses/python-main-function/continue/#t=76.92
There is also a conditional, or if statement, that checks the value of __name__ andhttps://realpython.com/courses/python-main-function/continue/#t=76.92
compares it to the string "__main__".https://realpython.com/courses/python-main-function/continue/#t=81.66
01:24https://realpython.com/courses/python-main-function/continue/#t=84.363
When thehttps://realpython.com/courses/python-main-function/continue/#t=84.363
if statement evaluates to True, the Python interpreter executes main().https://realpython.com/courses/python-main-function/continue/#t=84.84
If you want to learn more about conditional statements,https://realpython.com/courses/python-main-function/continue/#t=89.43
then you can find more tutorials on the Real Python site—https://realpython.com/courses/python-main-function/continue/#t=91.8
just enter “conditional statements” in the search box.https://realpython.com/courses/python-main-function/continue/#t=95.49
01:39https://realpython.com/courses/python-main-function/continue/#t=99.03
This code pattern is quite common in Python files that you want to be executedhttps://realpython.com/courses/python-main-function/continue/#t=99.03
as a script or imported into another module.https://realpython.com/courses/python-main-function/continue/#t=103.08
To help understand how this codehttps://realpython.com/courses/python-main-function/continue/#t=105.953
will execute,https://realpython.com/courses/python-main-function/continue/#t=108.06
you should first understand how the Python interpreter sets __name__, and that’shttps://realpython.com/courses/python-main-function/continue/#t=109.17
what’s coming up in the next lesson,https://realpython.com/courses/python-main-function/continue/#t=113.97
where you will see that it depends on how the code is being executed.https://realpython.com/courses/python-main-function/continue/#t=115.83
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Overviewhttps://realpython.com/courses/python-main-function/
https://realpython.com/lessons/execution-modes-python/
Defining Main Functions in Python: Overview 02:01 https://realpython.com/videos/python-main-function-overview/
Execution Modes in Python 04:48 https://realpython.com/lessons/execution-modes-python/
Best Practices for Python Main Functions 11:17 https://realpython.com/lessons/best-practices-python-main-functions/
Defining Main Functions in Python (Quiz) 04:00 https://realpython.com/lessons/defining-main-functions-in-python-quiz/
Defining Main Functions in Python: Summary 00:49 https://realpython.com/lessons/defining-main-functions-python-summary/
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