CI: Setup 3.9 Travis Build

.travis.yml

@@ -27,6 +27,11 @@ matrix:
   fast_finish: true
 
   include:
+    # In allowed failures
+    - dist: bionic
+      python: 3.9-dev
+      env:
+        - JOB="3.9-dev" PATTERN="(not slow and not network and not clipboard)"
     - env:
         - JOB="3.8" ENV_FILE="ci/deps/travis-38.yaml" PATTERN="(not slow and not network and not clipboard)"
 
@@ -53,6 +58,11 @@ matrix:
       services:
         - mysql
         - postgresql
+  allow_failures:
+  - dist: bionic
+    python: 3.9-dev
+    env:
+        - JOB="3.9-dev" PATTERN="(not slow and not network)"
 
 before_install:
   - echo "before_install"
@@ -83,7 +93,7 @@ install:
 script:
   - echo "script start"
   - echo "$JOB"
-  - source activate pandas-dev
+  - if [ "$JOB" != "3.9-dev" ]; then source activate pandas-dev; fi
   - ci/run_tests.sh
 
 after_script:

ci/build39.sh

@@ -0,0 +1,23 @@
+#!/bin/bash -e
+# Special build for python3.9 until numpy puts its own wheels up
+
+sudo apt-get install build-essential gcc xvfb
+pip install --no-deps -U pip wheel setuptools
+pip install python-dateutil pytz pytest pytest-xdist hypothesis
+pip install cython --pre # https://github.com/cython/cython/issues/3395
+
+# Alternative for getting numpy:
+# pip install --pre -f https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com/ numpy
+git clone https://github.com/numpy/numpy
+cd numpy
+python setup.py build_ext --inplace
+python setup.py install
+cd ..
+rm -rf numpy
+
+python setup.py build_ext -inplace
+python -m pip install --no-build-isolation -e .
+
+python -c "import sys; print(sys.version_info)"
+python -c "import pandas as pd"
+python -c "import hypothesis"

ci/setup_env.sh

@@ -1,5 +1,10 @@
 #!/bin/bash -e
 
+if [ "$JOB" == "3.9-dev" ]; then
+    /bin/bash ci/build39.sh
+    exit 0
+fi
+
 # edit the locale file if needed
 if [[ "$(uname)" == "Linux" && -n "$LC_ALL" ]]; then
     echo "Adding locale to the first line of pandas/__init__.py"

pandas/compat/__init__.py

@@ -16,6 +16,7 @@
 
 PY37 = sys.version_info >= (3, 7)
 PY38 = sys.version_info >= (3, 8)
+PY39 = sys.version_info >= (3, 9)
 PYPY = platform.python_implementation() == "PyPy"
 
 

pandas/tests/scalar/timedelta/test_arithmetic.py

@@ -8,7 +8,7 @@
 import pytest
 
 import pandas as pd
-from pandas import NaT, Timedelta, Timestamp, _is_numpy_dev, offsets
+from pandas import NaT, Timedelta, Timestamp, _is_numpy_dev, compat, offsets
 import pandas._testing as tm
 from pandas.core import ops
 
@@ -416,7 +416,8 @@ def test_td_div_numeric_scalar(self):
             pytest.param(
                 np.float64("NaN"),
                 marks=pytest.mark.xfail(
-                    _is_numpy_dev,
+                    # Works on numpy dev only in python 3.9
+                    _is_numpy_dev and not compat.PY39,
                     raises=RuntimeWarning,
                     reason="https://github.com/pandas-dev/pandas/issues/31992",
                 ),