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1. Functions Functions in Python, in theory, work both like functions and subroutines in Fortran, in that (1) input comes via arguments and (2) output occurs through: a return variable (like Fortran functions) and/or arguments (like Fortran subroutines). In practice, functions in Python are written to act like Fortran functions, with a single output returned. (The return value is specified by the return statement.) If you want multiple returns, it’s easier to put them into a list or use objects. »