Let’s define a simple Python function: In [1]: def foo(x): …: return x * x …: In [2]: foo(5) Out[2]: 25 In [3]: foo(10) Out[3]: 100 As we can see, this function has a single parameter, “x”.  In Python, parameters are local variables whose values are set by whoever is calling the function. So we … Continue reading foo(y=y), and similar code that confuses Python newbies