python - Introspection to get decorator names on a method?

Question

I am trying to figure out how to get the names of all decorators on a method. I can already get the method name and docstring, but cannot figure out how to get a list of decorators.

Answer 1

I'm surprised that this question is so old and no one has taken the time to add the actual introspective way to do this, so here it is:

The code you want to inspect...

def template(func):
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)
    return wrapper

baz = template
che = template

class Foo(object):
    @baz
    @che
    def bar(self):
        pass

Now you can inspect the above Foo class with something like this...

import ast
import inspect

def get_decorators(cls):
    target = cls
    decorators = {}

    def visit_FunctionDef(node):
        decorators[node.name] = []
        for n in node.decorator_list:
            name = ''
            if isinstance(n, ast.Call):
                name = n.func.attr if isinstance(n.func, ast.Attribute) else n.func.id
            else:
                name = n.attr if isinstance(n, ast.Attribute) else n.id

            decorators[node.name].append(name)

    node_iter = ast.NodeVisitor()
    node_iter.visit_FunctionDef = visit_FunctionDef
    node_iter.visit(ast.parse(inspect.getsource(target)))
    return decorators

print get_decorators(Foo)

That should print something like this...

{'bar': ['baz', 'che']}

or at least it did when I tested this with Python 2.7.9 real quick :)