flask---上下文管理_安装context_locals

1. 上下文管理介绍

• 请求上下文管理(放 request/session )

• 应用上下文管理(放 app/g )

• 图片详解

2. flask源码中总共有2个localstack对象

# flask源码中总共有2个localstack对象
# context locals
# 两个单例模式，分别放不同的值
# 放 reqeust ,session
__strage__ ={
    1111:{ "stack":[RequestContext(reqeust ,session),]},
 	1112:{ "stack":[RequestContext(reqeust ,session),]},
 
}
_request_ctx_stack = LocalStack()
 
# 放app,g  创建的app对象，
__strage__ = {
     1111:{ "stack":[Appcontenxt (app,g),]
 
  	 1112:{ "stack":[Appcontenxt (app,g),]
}
_app_ctx_stack = LocalStack()
 
 
 
_request_ctx_stack.push('小魔方")
_app_ctx_stack. pushC'大魔方')