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New rules for scope in a function?

I have been programming for more years than I want to admit and believe that I have a good understanding when it comes to the Scope of Variables when using functions. Are the rules different when using python?

It looks as if I have to pass all variables to and from the function before it works.  Are variables used in the main program not also visible for use within the function?  Do these variables have to be declared as global?


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