python\ function 2

I. Namespaces and Scopes

Name Space classification:

Built-in namespaces

Import this

Dir (buil-in) View all built-in

Global namespaces

Local name space

Within the function body, etc.

Querying Global and Local

The Globals () method can get global content

The global content that the method obtains is the global content that was previously defined by the program when it was called

The locals () method can get local content

Two. Function nesting

function nested call

Other functions are called inside the function

Nested Definitions of functions

Define other functions inside a function

Three. Function object and Closure

A function is the first class of objects
     Functions can be assigned values
     Pass the function as a parameter
     Take a function as a return value
     Use the function as an element of the container type.

Definition of closures:

Defined to internal functions include the use of external scopes, but not the use of global scopes
Return value for the closure pack

Features: self-taking parameters

python\ function 2