Take a look at the following code. We declare a name, x, in the global scope, then we declare a function, func(y), and finally we call it, passing x:
# key.points.argument.passing.pyx = 3def func(y): print(y)func(x) # prints: 3
When func is called with x, within its local scope, a name, y, is created, and it's pointed to the same object x is pointing to. This is better clarified by the following figure (don't worry about Python 3.3, this is a feature that hasn't changed):
The right part of the preceding figure depicts the state of the program when execution has reached the end, after func has returned (None). Take a look at ...
