getattr(object, name[, default])

文档

返回对象命名属性的值。name必须是字符串。如果该字符串是对象的属性之一，则返回该属性的值。例如， getattr(x, 'foobar') 等同于 x.foobar。如果指定的属性不存在，且提供了 default 值，则返回它，否则触发 AttributeError。

Help

In [5]: help(getattr)                                                   Help on built-in function getattr in module builtins:

getattr(...)
    getattr(object, name[, default]) -> value
    Get a named attribute from an object; getattr(x, 'y') is equivalent to x.y.
    When a default argument is given, it is returned when the attribute doesn't
    exist; without it, an exception is raised in that case.

In [6]: getattr(str, "join")                                             Out[6]: <method 'join' of 'str' objects>

应用

Django CBV模式

OneView.as_view()
getattr(request.method.lower)

多个请求封装在一个类中, 通过getattr()获得匹配方法