How about some syntactic sugar for " __name__ == '__main__' "?
steve+comp.lang.python at pearwood.info
Sat Nov 15 11:52:38 CET 2014
John Ladasky wrote:
> I have taught Python to several students over the past few years. As I
> have worked with my students, I find myself bothered by the programming
> idiom that we use to determine whether a module is being executed or
> merely imported:
> "if __name__ == '__main__':"
> The use of two dunder tokens -- one as a name in a namespace, and the
> other as a string, is intimidating. It exposes too much of Python's guts.
The dunders are a tad ugly, but it's actually quite simple and elegant:
* every module has a global variable `__name__` which normally holds
the name of the module:
py> import functools
py> import math as foobarbaz
* When Python imports a module, it sets the global __name__ to that
module's actual name (as taken from the file name).
* But when Python runs a file, as in `python2.7 path/to/script.py`,
it sets the global __name__ to the magic value '__main__' instead
The consequence is that every module can tell whether it is being run as a
script or not by inspecting the __name__ global. That's all there is to it.
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