Just use builtin pyenv and tox

Author: Kroisse

.travis.yml

@@ -21,10 +21,10 @@ install:
   if [[ "$TRAVIS_OS_NAME" = "linux" ]]; then
     pip install --upgrade pip setuptools tox-travis
   elif [[ "$TRAVIS_OS_NAME" = "osx" ]]; then
-    brew tap drolando/homebrew-deadsnakes
-    brew install zlib
-    brew install python34 python35 python36 python3 pypy
-    pip install --upgrade pip setuptools
-    pip install tox
+    versions=(3.7.2 3.6.8 3.5.6 3.4.9 2.7.15 pypy3.5-6.0 pypy2.7-6.0.0)
+    for ver in $versions; do
+      pyenv install -s "$ver"
+    done
+    pyenv global $versions
   fi
 script: tox