Python设置docstring并获取动态生成的类方法的方法名称 [英] Python set docstring and get method name of dynamically generated classmethod
问题描述
我试图按以下方式获取/设置动态创建的类方法的名称和文档字符串,但在弄清楚确切的操作方法上遇到了麻烦:
I'm trying to get/set the name and docstring of dynamically created class methods as follows, but am having trouble figuring out exactly how to do it:
import sys
import inspect
class test(object):
pass
@classmethod
def genericFunc(cls, **kwargs):
print "function:", (inspect.stack()[0][3])
print "kwargs:", kwargs
function_list = ['myF1', 'myF2']
for func in function_list:
setattr(test, func, genericFunc)
#set docstring for func here?
if __name__ == '__main__':
x = test()
print "docstring:", x.myF1.__doc__
x.myF1(arg1="foo")
y = test()
print "docstring:", y.myF2.__doc__
y.myF2(arg1="foo", arg2="bar")
sys.exit()
当前输出为:
docstring: None
function: genericFunc
kwargs: {'arg1': 'foo'}
docstring: None
function: genericFunc
kwargs: {'arg1': 'foo', 'arg2': 'bar'}
我想拥有的是:
docstring: description of myF1
function: myF1
kwargs: {'arg1': 'foo'}
docstring: description of myF2
function: myF2
kwargs: {'arg1': 'foo', 'arg2': 'bar'}
在for循环中,我尝试执行 setattr(test.func , __ doc __,%s的描述%func)
,从而导致AttributeError异常(类型对象 test没有属性 func), nd如果我硬编码'test.myF1'而不是'test.func',则会因'instancemethod'的属性'__ doc __'
不可写而得到AttributeError。
In the for loop I tried doing setattr(test.func, "__doc__", "description of %s" % func)
, which resulted in an AttributeError exception (type object 'test' has no attribute 'func'), and if I hard-code 'test.myF1' instead of 'test.func' I get an AttributeError for attribute '__doc__'
of 'instancemethod' not being writable.
最后,inspect.stack()返回 genericFunc而不是动态函数名( myF1或 myF2),是否有可能获取/设置后者这样我就可以检查genericFunc中方法的 __ name __
的值,以根据其值执行某些操作?
Finally, the inspect.stack() returns "genericFunc" instead of a dynamic function name ('myF1' or 'myF2'), is it possible to get/set the latter so that I can check the value of the method's __name__
within genericFunc to perform certain actions depending on its value?
推荐答案
您的通用函数本身没有文档字符串。当我添加文档字符串时,这对我来说工作正常:
Your generic function itself doesn't have a docstring. This works fine for me when I add a docstring:
import inspect
class test(object):
pass
@classmethod
def genericFunc(cls, **kwargs):
""" I'm a docstring"""
print "function:", (inspect.stack()[0][3])
print "kwargs:", kwargs
function_list = ['myF1', 'myF2']
for func in function_list:
setattr(test, func, genericFunc)
#set docstring for func here?
if __name__ == '__main__':
x = test()
print "docstring:", x.myF1.__doc__
x.myF1(arg1="foo")
y = test()
print "docstring:", y.myF2.__doc__
y.myF2(arg1="foo", arg2="bar")
此外,为什么最后要使用sys.exit()?结果,我得到:
Also, why sys.exit() at the end? As a result, I get:
docstring: I'm a docstring
function: genericFunc
kwargs: {'arg1': 'foo'}
docstring: I'm a docstring
function: genericFunc
kwargs: {'arg1': 'foo', 'arg2': 'bar'}
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