Tiuollaista kertoo:
ilkka@T410:~$ pip show attrs
---
Metadata-Version: 1.1
Name: attrs
Version: 15.2.0
Summary: Attributes without boilerplate.
Home-page: 
https://attrs.readthedocs.org/Author: Hynek Schlawack
Author-email: hs@ox.cx
License: MIT
Location: /usr/lib/python2.7/dist-packages
Requires: 
Classifiers:
  Development Status :: 5 - Production/Stable
  Intended Audience :: Developers
  Natural Language :: English
  License :: OSI Approved :: MIT License
  Operating System :: OS Independent
  Programming Language :: Python
  Programming Language :: Python :: 2
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: 3.5
  Programming Language :: Python :: Implementation :: CPython
  Programming Language :: Python :: Implementation :: PyPy
  Topic :: Software Development :: Libraries :: Python Modules
You are using pip version 8.1.1, however version 18.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Mites tuon pipin saa päivitettyä, kun ei ehdotus toimi?