python AttributeError: __enter__ code example

Example 1: AttributeError: __enter__

with ParamExample(URI) as pe, MotionCommander(pe, default_height=0.3) as mc:

Example 2: AttributeError: __enter__ in python cde

This is the peice of code which had AttributeError: __enter__
  with sr.Microphone as source:
It got resolved by adding '()' as below:
  with sr.Microphone() as source: