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Can global variable be passed into Python function?

On Thursday, February 27, 2014 10:43:23 PM UTC-6, Chris Angelico wrote:

> Simple rule of thumb: Never use 'is' with strings or ints. They're
> immutable, their identities should be their values. Playing with 'is'
> will only confuse you, unless you're specifically going for 
> introspection and such.

Right.  The only time I use "is"   is when I'm trying to explain to someone new to python assignment what is happening inside... what Mark Summerfield calls "python's beautiful heart," in his his recent book, "Programming in Python 3" ... a great resource, by the way.