Pin Python to 3.9 in environment.yml on CircleCI and skip mypy tests …

…in conda build (#1176)

* Pin python to 3.9 for quicker environment solve

* Skip mypy tests when building conda package

* Pin only on CircleCI

.circleci/config.yml

@@ -64,6 +64,8 @@ jobs:
             . /opt/conda/etc/profile.d/conda.sh
             set -x
             mkdir /logs
+            # Pin Python version for faster environment solve
+            echo "  - python=3.9" >> environment.yml
             # Add additional requirements for running all tests
             echo "
               - r-base
@@ -135,6 +137,8 @@ jobs:
           command: |
             . /opt/conda/etc/profile.d/conda.sh
             mkdir /logs
+            # Pin Python version for faster environment solve
+            echo "  - python=3.9" >> environment.yml
             # Add additional requirements for running all tests
             echo "
               - r-base

environment.yml

@@ -10,6 +10,6 @@ dependencies:
   - esmpy
   - iris>=3.0.1
   - graphviz
-  - python>=3.6  # if 3.7 lxml will not import correctly if <4.5.0
+  - python>=3.6
   - python-stratify
   - scipy<1.6  # until ESMValGroup/ESMValCore/issues/927 gets resolved

package/meta.yaml

@@ -77,8 +77,8 @@ test:
     - r-yaml
     - ncl
   commands:
-    - pytest -n 2 -m "not sequential" --ignore=run_test.py
-    - pytest -n 0 -m "sequential" --ignore=run_test.py
+    - pytest -n 2 -m "not mypy and not sequential" --ignore=run_test.py
+    - pytest -n 0 -m "not mypy and sequential" --ignore=run_test.py
     - esmvaltool -- --help
     - esmvaltool version
   imports: