Flask Web Development Reading notes

The two main dependencies of 1.Flask:

routing, debugging, and Web server gateway interfaces (Web server gateway INTERFACE,WSGI) subsystems are provided by Werkzeug.

The template system is provided by JINJA2.

Werkzeug Features:

HTTP header parsing and encapsulation

Easy-to-use request and response objects

Browser-based interactive JavaScript debugger

Compatible with WSGI 1.0 specification 100%

Support for Python 2.4-python 2.7 (Python 3.0 experimental Support)

Unicode supported

Support for basic session management and signature cookies

Unicode usage tools that support URIs and IRI

Built-in support for various browsers and WSGI server-compatible utilities

Integrated URL Request Routing system

2. The view function processes the request and returns the return value as a response

Request Hook function: Before_first_request

Before_request

After_request

Teardown_request

The context in which the view function and the request hook function can be used:

Program Context: Current_app (program instance)

g (Temporary storage object)

Request Context: Requests (Request object)

Session (user sessions)

3. Separating the business logic from the presentation logic, the presentation logic is implemented using a template, and the template is rendered by the JINJA2 template engine.

4. Use Flask-bootstrap to integrate the bootstrap client framework.

5. Using Flask-moment to localize dates and times

6. Using FLASK-WTF to process Web Forms

7. Using SQL or NoSQL

For small and medium programs, SQL and NoSQL performance are comparable.

Relational database Benefits: storage data is efficient and avoids duplication. Cons: Data exists in more than one table, and data changes may require access to multiple tables and then join.

NoSQL: A document database, a key-value pair database, a collection instead of a table, and a document instead of a record. Pros: Put data into a collection, improve lookup efficiency, and operate simply (without coupling). Cons: Data duplication is large, the need to find related data in the program to perform junction operations, data updates may need to update a large number of documents.

Cond

Flask Web Development Reading notes