FIX: ImportError: cannot import name 'opentype'

Fix this problem:

File "/usr/local/lib/python3.5/dist-packages/oauth2client/_pure_python_crypt.py", line 24, in <module>
    from pyasn1_modules.rfc2459 import Certificate
  File "/usr/local/lib/python3.5/dist-packages/pyasn1_modules/rfc2459.py", line 20, in <module>
    from pyasn1.type import opentype

ImportError: cannot import name 'opentype'



SOLUTION: 

pip3 install --upgrade pyasn1-modules