Try py3.8

.travis.yml

@@ -16,10 +16,10 @@ matrix:
       python: 3.6
       env: 
         - ABINIT_VERSION=8.8.2 ABIPY_INSTALLER=pip
-#    - os: linux
-#      python: 3.7
-#      env: 
-#        - ABINIT_VERSION=8.8.2 ABIPY_INSTALLER=pip
+    - os: linux
+      python: 3.7
+      env: 
+        - ABINIT_VERSION=8.8.2 ABIPY_INSTALLER=pip
 
 #dist: precise
 sudo: false
@@ -27,20 +27,20 @@ install:
   #- sudo apt-get update
   - env
   #- set -ev  # exit on first error, print each command
+  - set -v  
 
   - |
       # pip-based installation.
       if [ "${ABIPY_INSTALLER}" == "pip" ]; then
         source dev_scripts/conda_get.sh  # Needed for Abinit
-        conda install abinit
         echo "Installing abinit from abinit channel ..."
-        #conda install -y -c gmatteo abinit=${ABINIT_VERSION}
         conda install -y -c abinit abinit=${ABINIT_VERSION}
         abinit --version
         abinit --build
+        sed -i '/pymatgen/d' requirements.txt
         travis_wait pip install -r requirements.txt
         travis_wait pip install -r requirements-optional.txt
-        travis_wait pip uninstall -y pymatgen
+        #travis_wait pip uninstall -y pymatgen
 
       # Install conda https://conda.io/docs/travis.html
       elif [ "${ABIPY_INSTALLER}" == "conda" ]; then