module either imported by a command or itself run as a command

[Skaperen]

i have a module that sometimes i want to run as a command. the problem is that the script that is importing it could be used as a command. thus, there are two scenarios in which variable __name__ would have the value "__main__". but. i want to be able to distinguish these two scenarios so that the module can stay being one file (perhaps named "foo.py") and be imported by a script (done simply like "import foo") where the importing script (perhaps named "bar.py") is run as a command. how can i make the module determine that it is invoked as a command without being confused by the importing script being invoked as a command.