Python Day Tenth (function two)

First, default parameters of the trap

If you set a default parameter to an empty list in the row parameter and then perform the function in the value multiple times, the following function will share the list.

def func (k,l = {}):    'v'    print(l) func (1  ) func (2) func (3)

Results:

{1: ' V '}
{1: ' V ', 2: ' V '}
{1: ' V ', 2: ' V ', 3: ' V '}

Two or three-dollar operation (Trinocular operation)

Three conditions:

There has to be a result.

Must have if and else

It could just be a simple situation.

x = 4=2ifelse  yprint(a)

Three or three types of namespaces

Built-in namespaces-Python interpreter

Global namespaces--write functions, but not code in functions

Local namespaces--functions

Python Day Tenth (function two)