python-Primary Knowledge function

Definition of the function:

Functions are well-organized, reusable, code snippets for single, or associated functionality

Role of the function:

function can improve the modularity of the application, and the reuse of the Code

Any incoming parameter and first line statement can optionally use a document string-----for storing function descriptions

Function contents start with a colon, and indent

Basic format:

def wrapper () #函数的定义

Print (xxxxxxx)

Wrapper () #函数的调用

The return value of the function:

Return

Once the return is encountered, the entire function is ended

Return a value:-------> Only need to add a return at the end of return

return 18

Returns multiple values:--------> can return multiple values, any type of value

Parameters of the function:

Formal parameters: Def wrapper (formal parameters)

Arguments: Wrapper (argument)

Stand at the argument angle: Position parameter, key-word-pass-parameter, mixed-pass parameter
Standing parameter angle: Positional parameters must be passed
--------------------------------------------
Positional parameters default parameter dynamic parameters
corresponding Gender (*args,**kwargs)
--------------------------------------------

To pass the parameter:
Dynamic parameter transfer

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Namespaces and Scopes

Namespaces:
1. Global namespaces
2. Local namespaces
3. Built-in namespaces

Load Order:
Built-in namespaces (load before program runs)
Global Namespaces (Program running: loading from top to bottom)
Local namespace (program run total: Before the call is loaded)
Order of Values:
In local calls: Built-in namespaces, local namespaces, global namespaces
Global invocation: Built-in namespaces, global namespaces

Scope:
Global scope
Local scope

Global: Local Call to Globals
Locals

Nonlocal: References and modifications to the variables of the parent scope, and to which layer it is referenced, all occurrences of the variable from that level and below

Name of function:
The function name essence is the memory address of the function

Closures:
intrinsic function references to external scope variables, called closures (non-global scopes)

Intrinsic functions:
functions defined inside a function are called intrinsic functions

def func ():
name = ' Taibai Venus '
def inner ():
Print (name)

intrinsic function references to external scope variables, closures
name = ' Taibai Venus '
def inner ()
Print (name)
----------------------------------------
Intrinsic functions:
name = ' Taibai Venus '
def inner ()-----------> intrinsic functions defined inside the function
Print (name)

python-Primary Knowledge function