Python bug report

[Ranya]

Hi,
Am trying to use clr.AddReference and clr.AddReferenceToFile, but
python(2.7) keeps making this error:

Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    clr.AddReference("UnityEngine")AttributeError: 'module' object has
no attribute 'AddReference'

How can I fix this?
Thanks in advance.