Support Python 3.8 (#191)

.travis.yml

@@ -5,6 +5,7 @@ python:
   - 3.5
   - 3.6
   - 3.7
+  - 3.8
 
 env:
   - TEST=API

requirements-test.txt

@@ -1,13 +1,13 @@
-numpy==1.16.1
-scipy==1.1.0
-scikit-learn==0.20.2
+numpy==1.18.2
+scipy==1.4.1
+scikit-learn==0.22.2.post1
 xgboost==1.0.2
-lightgbm==2.2.3
-flake8==3.6.0
-pytest==5.3.2
-pytest-mock==1.13.0
-coveralls==1.9.2
+lightgbm==2.3.1
+flake8==3.7.9
+pytest==5.4.1
+pytest-mock==3.0.0
+coveralls==2.0.0
 pytest-cov==2.8.1
-py-mini-racer==0.1.18
+py-mini-racer==0.2.0
 statsmodels==0.11.1
 git+git://github.com/scikit-learn-contrib/lightning.git@b96f9c674968496e854078163c8814049a7b9f43

setup.py

@@ -28,6 +28,7 @@
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: CPython",
     ],
     keywords="sklearn ml code-generation",

tests/utils.py

@@ -218,7 +218,7 @@ def predict_from_commandline(exec_args):
     result = subprocess.Popen(exec_args, stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)
     stdout, stderr = result.communicate()
-    if result.returncode is not 0:
+    if result.returncode != 0:
         raise Exception("bad exit code ({}) stderr: {}".format(
                         result.returncode, stderr.decode("utf-8")))