Head First Python第2版：趣味学习Python编程与实战应用

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table of contents

xiv

building a webapp

Getting Real

At this stage, you know enough Python to be dangerous.

With this book’s first four chapters behind you, you’re now in a position to productively

use Python within any number of application areas (even though there’s still lots of

Python to learn). Rather than explore the long list of what these application areas

are, in this and subsequent chapters, we’re going to structure our learning around the

development of a web-hosted application, which is an area where Python is especially

strong. Along the way, you’ll learn a bit more about Python.

Python: What You Already Know 196

What Do We Want Our Webapp to Do? 200

Let’s Install Flask 202

How Does Flask Work? 203

Running Your Flask Webapp for the First Time 204

Creating a Flask Webapp Object 206

Decorating a Function with a URL 207

Running Your Webapp’s Behavior(s) 208

Exposing Functionality to the Web 209

Building the HTML Form 213

Templates Relate to Web Pages 216

Rendering Templates from Flask 217

Displaying the Webapp’s HTML Form 218

Preparing to Run the Template Code 219

Understanding HTTP Status Codes 222

Handling Posted Data 223

Refining the Edit/Stop/Start/Test Cycle 224

Accessing HTML Form Data with Flask 226

Using Request Data in Your Webapp 227

Producing the Results As HTML 229

Preparing Your Webapp for the Cloud 238

Chapter 5’s Code 241

table of contents

xviii

$ mysql -u vsearch -p vsearchlogDB

Enter password:

Welcome to MySQL monitor...

mysql> select * from log;

+----+---------------------+--------------------------+---------+-----------+----------------+----------------------+

| id | ts | phrase | letters | ip | browser_string | results |

+----+---------------------+--------------------------+---------+-----------+----------------+----------------------+

| 1 | 2016-03-09 13:40:46 | life, the uni ... ything | aeiou | 127.0.0.1 | firefox | {'u', 'e', 'i', 'a'} |

| 2 | 2016-03-09 13:42:07 | hitch-hiker | aeiou | 127.0.0.1 | safari | {'i', 'e'} |

| 3 | 2016-03-09 13:42:15 | galaxy | xyz | 127.0.0.1 | chrome | {'y', 'x'} |

| 4 | 2016-03-09 13:43:07 | hitch-hiker | xyz | 127.0.0.1 | firefox | set() |

+----+---------------------+--------------------------+---------+-----------+----------------+----------------------+

4 rows in set (0.0 sec)

mysql> quit

Bye

File Edit Window Help Checking our log DB

the context management protocol

Hooking into Python’s with Statements

It’s time to take what you’ve just learned and put it to work.

Chapter 7 discussed using a relational database with Python, while Chapter 8 provided an

introduction to using classes in your Python code. In this chapter, both of these techniques are

combined to produce a context manager that lets us extend the with statement to work with

relational database systems. In this chapter, you’ll hook into the with statement by creating a

new class, which conforms to Python’s context management protocol.

What’s the Best Way to Share Our Webapp’s Database Code? 336

Managing Context with Methods 338

You’ve Already Seen a Context Manager in Action 339

Create a New Context Manager Class 340

Initialize the Class with the Database Config 341

Perform Setup with Dunder “enter” 343

Perform Teardown with Dunder “exit” 345

Reconsidering Your Webapp Code, 1 of 2 348

Recalling the “log_request” Function 350

Amending the “log_request” Function 351

Recalling the “view_the_log” Function 352

It’s Not Just the Code That Changes 353

Amending the “view_the_log” Function 354

Answering the Data Questions 359

Chapter 9’s Code, 1 of 2 360

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Head First Python第2版：趣味学习Python编程与实战应用

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