fix get_func_args error and update the doc

docs/inspect.rst

@@ -11,10 +11,12 @@ Inspect
     ``defaults`` is an n-tuple of the default values of the last n arguments.
 
     >>> from pydu.inspect import getargspec
-  >>> def f(a, b=1, *c, **d):
+    >>> def f(name, address='home', age=25, *args, **kwargs):
     ...     pass
+    ...
     >>> getargspect(f)
-  ArgSpec(args=['a', 'b'], varargs='c', keywords='d', defaults=(1,))
+    ArgSpec(args=['name', 'address', 'age'], varargs='args', keywords='kwargs', defaults=('home', 25))
+
 
 .. py:function:: pydu.inspect.get_func_args(func)
 

pydu/inspect.py

@@ -16,7 +16,7 @@ if PY2:
     def get_func_args(func):
         argspec = inspect.getargspec(func)
         if inspect.ismethod(func):
-            return argspec[1:] # ignore 'self'
+            return argspec.args[1:] # ignore 'self'
         return argspec.args