Definition

Here’s a definition typed interactively that defines a function called times, which returns the product of its two arguments:

>>> def times(x, y):       # Create and assign function
...     return x * y       # Body executed when called
...

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When Python reaches and runs this def, it creates a new function object that packages the function’s code and assigns the object to the name times. Typically, such a statement is coded in a module file and runs when the enclosing file is imported; for something this small, though, the interactive prompt suffices.