What Does if name == "main" do in Python?
if __name__ == "main" is a guarding block that is used to contain the code that should only run went the file in which this block is defined is run as a script. What it means is that if you run the file as a script the `__name__
variable will be equal to'main'`.
Let’s look at an example:
mylib.py: def say_hi(): print('hi from the function') if __name__ == 'main': print('the main block is being executed') say_hi()
In the example above, we have defined a
say_hi function that will simply say hi when called. Then there is a guarded block with the
if __name__ == 'main': statement.
If you run the script in the console lie this:
The output will be the following:
Output: the main block is being executed hi from the function
But if you include the
mylib.py file in some other python file and run that file as a script, you will see that the guarded block will not be executed.
other.py: import say_hi from mylib say_hi()
Output: hi from the function
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