After a couple of weeks studying Python, I already have a few useful
scripts, including one that downloads 1500 Yahoo stock quotes in 6
seconds. However, many things are puzzling to me. I keep on seeing
things like "__main__" in scripts. A more obscure example would be
"__add__" used in string concatenation. For example, I can use "Hello
"+"world (or just "Hello" "world") to join those two words. But I can
also use "Hello ".__add__("world"). When and why would I ever use
"__main__" or the many other "__whatever__" constructs?
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