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１.对是否是模块，框架，函数等进行类型检查。

２.获取源码。

３.获取类或者函数的参数的信息

４.解析堆栈

模块文档：

This module encapsulates the interface provided by the internal special attributes (func_, co_, im_, tb_, etc.) in a friendlier fashion.It also provides some help for examining source code and class layout.
Here are some of the useful functions provided by this module:

ismodule(), isclass(), ismethod(), isfunction(), isgeneratorfunction(),isgenerator(), istraceback(), isframe(), iscode(), isbuiltin(),isroutine() - check object types

getmembers() - get members of an object that satisfy a given condition

getfile(), getsourcefile(), getsource() - find an object’s source code

getdoc(), getcomments() - get documentation on an object

getmodule() - determine the module that an object came from

getclasstree() - arrange classes so as to represent their hierarchy

getargspec(), getargvalues(), getcallargs() - get info about function arguments

formatargspec(), formatargvalues() - format an argument spec

getouterframes(), getinnerframes() - get info about frames

currentframe() - get the current stack frame

stack(), trace() - get info about frames on the stack or in a traceback