Why This Programs show Error. if __name__ == '__main__':

Question

def name(name):
print(f"This Is {name}")
if __name__ == '__main__':
name("ahmed")

When i import this program to another program this program show error.

Answer 1

Because you imported it.

if __name__ = '__main__':
pass
is a check that sees if the module with said code is in fact the "main" module (the module you are currently working in) if you import a module with that code, that module is now not the "main" module. So now, importedmodule != '__main__'.
The code either wont run or raise an exeption