19 if __name__ == ‘__main__’ meaning Ultimate Guide
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What does the if name main do in Python [1]
What does the if __name__ == “__main__”: do in Python?. This article explains what the Python code expression if __name__ == ‘__main__’ means.
The code inside the if statement is not executed when the file’s code is imported as a module.. The word “__name__” denotes a unique variable in Python.
They are referred to as dunder to keep it brief (from Double Underscores). In this case, “__name__” is pronounced “dunder name.”
” Do in Python? – Real Python [2]
if __name__ == “__main__” idiom when reading other people’s code. No wonder—it’s widespread! You might have even used
if __name__ == “__main__” idiom is just a normal conditional block:. The indented block starting in line 2 contains all the code that Python will execute when the conditional statement in line 1 evaluates to
if __name__ == “__main__” idiom, then why does it look confusing, and why does it continue to spark discussion in the Python community?. If the idiom still seems a little cryptic, and you’re not completely sure what it does, why you might want it, and when to use it, then you’ve come to the right place! In this tutorial, you’ll learn all about Python’s
” Do in Python? – Real Python [3]
if __name__ == “__main__” idiom when reading other people’s code. No wonder—it’s widespread! You might have even used
if __name__ == “__main__” idiom is just a normal conditional block:. The indented block starting in line 2 contains all the code that Python will execute when the conditional statement in line 1 evaluates to
if __name__ == “__main__” idiom, then why does it look confusing, and why does it continue to spark discussion in the Python community?. If the idiom still seems a little cryptic, and you’re not completely sure what it does, why you might want it, and when to use it, then you’ve come to the right place! In this tutorial, you’ll learn all about Python’s
What does the if __name__ == “__main__”: do? [4]
Before executing code, Python interpreter reads source file and define few special variables/global variables.. If the python interpreter is running that module (the source file) as the main program, it sets the special __name__ variable to have a value “__main__”
Module’s name is available as value to __name__ global variable.. A module is a file containing Python definitions and statements
When we execute file as command to the python interpreter,. – All of the code that is at indentation level 0 [Block 1] gets executed
What does if __name__ == “__main__”: do? [5]
If you are a beginner, probably the only answer you need right now is that this code is unnecessary for a simple script. unpickle etc; see the other answers here for some other non-beginner scenarios).
If you don’t have a specific reason to hide something, don’t: If you don’t need to hide some code from. import, don’t put it behind this guard, and if you do, hide as little as possible.
“__main__” in this scenario, so the condition is actually unnecessary. import fib with the new version, but if you didn’t plan to do that in the first place, this version is actually better, because it’s simpler and clearer.
Python if __name__ == __main__ Explained with Code Examples [6]
When a Python interpreter reads a Python file, it first sets a few special variables. If you follow this article step-by-step and read its code snippets, you will learn how to use
Python files are called modules and they are identified by the. A module can define functions, classes, and variables.
But if the code is importing the module from another module, then the. __name__ variable will be set to that module’s name.
if __name__ == ‘__main__’: What does it mean (Python) [7]
When you start working with other people’s code you will run into the. if __name__ == ‘__main__’ statement at the end of the Python code
What this statement does is to check whether you run the module (or script) directly, or if you import the module from another one.. def my_funct(): print(‘hello’) if __name__ == ‘__main__’: my_funct()
In short, the code inside the conditional block (if name equals main) is executed only when the script is run from the command line or through an IDE. It is not executed when it is used as a module by another Python script
What Does if __name__ == “__main__”: Do in Python? [8]
if __name__ == “__main__” in Python scripts we find online, or one of the many we write ourselves.. Why do we use that if-statement when running our Python programs? In this article, we explain the mechanics behind its usage, the advantages, and where it can be used.
The Python interpreter automatically adds this value when we are running a Python script or importing our code as a module.. Try out the following command on your Python interpreter
name_scripts so we can write a few scripts to understand how this all works. print(f’The __name__ from script1 is “{__name__}”‘)
“if __name__ == ‘__main__'” in Python [9]
if __name__ == ‘__main__’, which is commonly found in Python code.. At first glance, the underscores might seem confusing, but it is simply an
In Python, string literals can be enclosed in either single quotes. __name__ attribute stores the module’s name as a string
def func(): print(‘Hello!’) print(‘__name__ is’, __name__). import hello print(hello.__name__) # hello hello.func() # Hello! # __name__ is hello
Python if __name__ == “__main__”: Explain? [10]
if __name__ == “__main__”: statement is used to control the execution of a script. For example, if you wanted to execute the code only if it is called as a script and not execute when it is imported as a module.
Here is a simple usage from which you can have a basic idea of how to use if __name__==”__main__”. main() function will only be called if the script is run directly
if __name__ == “__main__”: statement is a conditional statement that is used in Python scripts to control the execution of the script.. __name__attribute, which is a built-in variable that is set by the Python interpreter when a script is executed.
Understanding if __name__==’__main__’ in Python [11]
In this guide, you will understand the functionality and significance of if __name__ == ‘__main__’ in Python.. Have you ever skimmed through a Python codebase with different modules?
Over the next few minutes, we’ll demystify what the above conditional means and look at an example where it can be helpful.. In Python, a module is a .py file that contains function definitions, a set of expressions to be evaluated, and more
When you run a Python module, the Python interpreter sets the values for a few special variables ahead of execution:. __name__ is understanding how imports work in Python.
__main__ — Top-level code environment ¶ [12]
the name of the top-level environment of the program, which can be checked using the. Both of these mechanisms are related to Python modules; how users interact with them and how they interact with each other
Usually, this is the name of the Python file itself without the. >>> import configparser >>> configparser.__name__ ‘configparser’
However, if the module is executed in the top-level code environment,. __main__ is the name of the environment where top-level code is run.
Python’s Mysterious ‘if __name__ == “__main__”‘ Explained [13]
While reading a Python program you might find the expression if __name__ == ‘__main__’.. Let’s have a look at what it means and why you should know about it.
When the code in the file is imported as a module the code inside the if statement is not executed.. It might not be very clear why this is done and with this tutorial, the reason will become clear.
There are many special variables in Python that start and end with double underscores. To make it short they are referred to as dunder (from Double Underscores)
Use of the ‘if __name__ == __main__’ Statement in Python [14]
Create a Python file with the following script that calls the main() function if the value of the __name__ variable is __main__. The main() function has been declared in the script to define the statements
So, the ‘if’ statement will be returned True and the main() function will be called.. The following output will appear after executing the above script
Example-2: Print the Value of the __name__ Variable. Create a Python file with the following script that calls the main() function if the value of the __name__ variable is __main__, like the previous example
Python Tutorial: __name__ == __main__ [15]
In other words, the code within the ‘if’ block will be executed only when the code runs directly. Let’s see what it does using a simple code that prints the name of the modue:
If we run the code directly via “python m1.py”, the module name is “__main__”:. Note also that we can run the code directly using “-m” option:
For modules that can usually be imported just using. python -m module_name to run that module directly (we don’t need to know the path!).
‘ in Python mean? [16]
Like other programming languages, Python too has an execution entry point i.e. A module is a file containing Python definitions and statements
The value of __name__ attribute is set to ‘__main__’ when module run as main program.. When you execute a Python script , it is treated as the main and its __name__ attribute is set to “__main__”
By doing the main check, you can have that code only execute when you want to run the module as a program and not have it execute when someone just wants to import your module and call your functions themselves. Consider the following code for better understanding, it checks if a module is being imported or not.
What does if __name__ == “__main__” do? [17]
It is boilerplate code that protects users from accidentally invoking a script when they didn’t intend to, and it’s good practice apply it. In the latter case usually we only want to import the module and then later in the code execute some functions or use a class from this file
When the Python interpreter reads a source file, it does two things:. – Then it executes all of the code it finds in the file
# This is foo.py def functionA(): print(“Function A”) if __name__ == “__main__”: print(“Running foo”) functionA(). The Python interpreter will assign the hard-coded string
_name_ _main_ in Python [18]
The main() function is required in programmes developed in the C family of languages (C, C++, Java, C#, etc.) to designate where the execution should begin.. However, because Python is an interpreter-based language that can also be used in an interactive shell, there is no such thing as a main() method in it
The first statement of the Python programme file is where the execution begins.. Python interpreter analyses source file and defines some special variables/global variables before running code
__name__ will be set to the name of the module if the same file is being fetched from another module. The __name__ global variable accepts the module name as a value.
What is if __name__ == “__main__” in Python [19]
Python is one of the growing high level languages out there. In the recent list of language popularity published by GitHub, Python was in the top list
The syntax of python is quite straight forward and easy to understand, without the confusing curly braces all over the place.. Another reason for Python’s popularity is its use as a server side scripting language
With the availability of ready made modules for almost everything, its quite easy to implement something in Python these days.. In this article we will discuss one of the popular statements that new python users encounter in the programs
Sources
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