language: python
python:
  - "3.2"
  - "3.3"
  - "3.4"
  - "3.5"
install: 
  - if [ "$TRAVIS_PYTHON_VERSION" == "3.2" ]; then travis_retry pip install coverage==3.7.1; fi
  - if [ "$TRAVIS_PYTHON_VERSION" != "3.2" ]; then travis_retry pip install coverage; fi
  - "pip install pytest pytest-cov"
script: py.test --doctest-modules --cov ./
language: python
python:
  - "3.2"
  - "3.3"
  - "3.4"
  - "3.5"
  - "3.6"
  - "3.6-dev"
  - "3.7-dev"
  - "nightly"
install: 
  - if [ "$TRAVIS_PYTHON_VERSION" == "3.2" ]; then travis_retry pip install coverage==3.7.1; fi
  - if [ "$TRAVIS_PYTHON_VERSION" != "3.2" ]; then travis_retry pip install coverage; fi
  - "pip install pytest pytest-cov"
script: py.test --doctest-modules --cov ./
Add most recent Python versions in Travis CI
Add most recent Python versions in Travis CI

Add more recent Python versions including
development branches and nightly build.
