module 'boto3' has no attribute 'client'

I’m using python 3.5.1 and boto3==1.3.1

Python 3.5.1 (default, Jan 22 2016, 08:52:08) 
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin

This is what I get trying to run boto3

Traceback (most recent call last):
  File "test_cognito.py", line 7, in <module>
    client = boto3.client('cognito-identity')
AttributeError: module 'boto3' has no attribute 'client'

Any ideas?