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Introduction

Python Language Rules

Lint Imports Packages Exceptions Global Variables Nested/Local/Inner Classes and Functions List Comprehensions Default Iterators and Operators Generators Lambda Functions Conditional Expressions Default Argument Values Properties True/False Evaluations Deprecated Language Features Lexical Scoping Function and Method Decorators Threading Power Features

Python Style Rules

Semicolons Line Length Parentheses Indentation Blank Lines Whitespace Shebang Line Comments Classes Strings Files and Sockets TODO Comments Imports Formatting Statements Access Control Naming Main

Django Style Rules

Models Views Forms Urls

Files and Sockets

在使用完文件或socket之后，必须显式的关闭，除非使用了with语句块。

with open("hello.txt") as hello_file:
    for line in hello_file:
        print line

对于不支持with语句的文件类对象，可以使用contextlib.closing()。

import contextlib

with contextlib.closing(urllib.urlopen("https://www.python.org/")) as front_page:
    for line in front_page:
        print line

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