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If __name__==__main__ usage & necessity

“A __name__ is a built-in variable that returns us the name of the module being used.”

In simple words, by using __name__, we can check whether our module is being imported or run directly.

If we run it in the same module that it is created in, then it will print “main” onto the screen; otherwise, if it is being used elsewhere, then it will print the name of its module or file it is created in.

To fully understand what __name__ is and how it is used, let us go through an example.
print("__name__ in is set to"+__name__)


__name__ in is set to __main__

Let us create a new file in the same directory as

In this new file, let us import so that we can examine the __name__ variable in and let us also print the __name__ variable in
import tutmain1

print("__name in is set to"+__name__)

print("__name__ in is set to"+__name__)

Let us now move further to “if __name__ == “__main__”. Working with Python files, when we import one file to another, along with the functions and variables, we also import all the print statements and other such data that we do not require. In such cases, we insert all the data of the module that we do not want others to import into the main, and thus it can only be executed by the file containing the main only.

Now we may have a certain confusion about “main”, let us clear it out first. The main is a point of the program from where the program starts its execution. Every program has its own main function. The main function can only be executed when it is being run in the same program. If the file is being imported, then it is no longer the main function because the file that is importing it has its own “main” function.
    #Logic Statement

What are the Advantages of using if __name__ == “__main__” statement?

Following are the advantages of using if __name__ == “__main__” statement:

Using the main in our file, we can restrict some data from exporting to other files when imported.
We can restrict the unnecessary data, thus making the output cleaner and more readable.
We can choose what others may import or what they may not while using our module.

To summarise the concepts discussed in this tutorial, Modules in Python has a special attribute called __name__. The value of the __name__ attribute is set to __main__ when the module is run as the main program. Otherwise, the value of __name__ is set to the name of the module. The if __name__ == “__main__” block prevents the certain code from being run when the module is imported.


def printhar(string):
    return f"Ye string harry ko de de thakur {string}"

def add(num1, num2):
    return num1 + num2 + 5

print("aand the name is", __name__)

if __name__ == '__main__':
    o = add(4, 6)


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