Skip to content

Python

1 Introduction

1.1 Coding Style

  • Use spaces around operators and after commas,
  • Wrap lines so that they don't exceed 79 characters.
  • Use 4-space indentation, and no tabs.
  • Use blank lines to separate functions and classes, and larger blocks of code inside functions.
  • When possible, put comments on a line of their own.
  • Name your classes and functions consistently; the convention is to use UpperCamelCase for classes and
  • lowercase_with_underscores for functions and methods.
  • Always use self as the name for the first method argument.

Slice

object[start:stop:step]
切片内容不含冒号 (colon) 右边的索引。
反转列表或者字符串：

>>> word[::-1]

a[:, :, None] 和 a[..., None] 的输出是一样的。

Annotation (注释)

  • docstring
  • 单行注释, #
  • 多行注释, """"""

2 dir() and help()

Expression

call expression

Statement

Function

Formal parameters, frame,

Class

Modual

See Also