When defining functions at the read-eval-print loop as shown here, a blank line is required to denote the end of a function definition (lines 3 and 6).
A.7.2 Positional Vis-à-Vis Keyword Arguments
In defining a function in Python, the programmer must decide how they want the caller to assign argument values to parameters: by position (as in C), by keyword, or by a mixture of both. Readers with imperative programming experience are typically familiar with positional argument values, which are not prefaced with keywords, ...
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