python文档怎么看

查看文档是一个程序员的基本功，这里简单介绍几种查看Python文档的方法，下面以struct模块为例。

help

在交互模式下，help函数是获取文档的好帮手，使用非常简单。

>>>importstruct
>>>help(struct)
Helponmodulestruct:

NAME
struct

DESCRIPTION
FunctionstoconvertbetweenPythonvaluesandCstructs.
PythonbytesobjectsareusedtoholdthedatarepresentingtheCstruct
andalsoasformatstrings(explainedbelow)todescribethelayoutofdata
intheCstruct.

Theoptionalfirstformatcharindicatesbyteorder,sizeandalignment:
@:nativeorder,size&alignment(default)
=:nativeorder,std.size&alignment
<:little-endian,std.size&alignment
>:big-endian,std.size&alignment
!:sameas>

Theremainingcharsindicatetypesofargsandmustmatchexactly;
thesecanbeprecededbyadecimalrepeatcount:
x:padbyte(nodata);c:char;b:signedbyte;B:unsignedbyte;
?:_Bool(requiresC99;ifnotavailable,charisusedinstead)
h:short;H:unsignedshort;i:int;I:unsignedint;

__doc__

__doc__是每个对象都有的属性，其存放了对象文档。

>>>importstruct
>>>struct.__doc__
"FunctionstoconvertbetweenPythonvaluesandCstructs.\nPythonbytesobjectsareusedtoholdthedatarepresentingtheCstruct\nandalsoasformatstring
s(explainedbelow)todescribethelayoutofdata\nintheCstruct.\n\nTheoptionalfirstformatcharindicatesbyteorder,sizeandalignment:\n@:nativeo
rder,size&alignment(default)\n=:nativeorder,std.size&alignment\n<:little-endian,std.size&alignment\n>:big-endian,std.size&alignment\n
!:sameas>\n\nTheremainingcharsindicatetypesofargsandmustmatchexactly;\nthesecanbeprecededbyadecimalrepeatcount:\nx:padbyte(nodata)
;c:char;b:signedbyte;B:unsignedbyte;\n?:_Bool(requiresC99;ifnotavailable,charisusedinstead)\nh:short;H:unsignedshort;i:int;I:unsignedin
t;\nl:long;L:unsignedlong;

离线文档

安装Python时会自带一个chm格式的离线文档Python documention，该文档的信息比较全。

Python针对模块还有一个单独的文档，该文档在浏览器中查看。