Fix building python 3.7 wheel by installing newer numpy. (#3927)

python/build-wheel-manylinux1.sh

@@ -6,6 +6,19 @@ echo 10
 EOF
 chmod +x /usr/bin/nproc
 
+PYTHONS=("cp27-cp27mu"
+         "cp34-cp34m"
+         "cp35-cp35m"
+         "cp36-cp36m"
+         "cp37-cp37m")
+
+# On python 3.7, a newer version of numpy seems to be necessary.
+NUMPY_VERSIONS=("1.10.4"
+                "1.10.4"
+                "1.10.4"
+                "1.10.4"
+                "1.14.5")
+
 # Remove this old Python 2.4.3 executable, and make the "python2" command find
 # a newer version of Python. We need this for autogenerating some files for the
 # UI.
@@ -13,7 +26,9 @@ rm -f /usr/bin/python2
 ln -s /opt/python/cp27-cp27m/bin/python2 /usr/bin/python2
 
 mkdir .whl
-for PYTHON in cp27-cp27mu cp34-cp34m cp35-cp35m cp36-cp36m cp37-cp37m; do
+for ((i=0; i<${#PYTHONS[@]}; ++i)); do
+  PYTHON=${PYTHONS[i]}
+  NUMPY_VERSION=${NUMPY_VERSIONS[i]}
   # The -f flag is passed twice to also run git clean in the arrow subdirectory.
   # The -d flag removes directories. The -x flag ignores the .gitignore file,
   # and the -e flag ensures that we don't remove the .whl directory.
@@ -21,7 +36,7 @@ for PYTHON in cp27-cp27mu cp34-cp34m cp35-cp35m cp36-cp36m cp37-cp37m; do
   pushd python
     # Fix the numpy version because this will be the oldest numpy version we can
     # support.
-    /opt/python/${PYTHON}/bin/pip install -q numpy==1.10.4 cython==0.29.0
+    /opt/python/${PYTHON}/bin/pip install -q numpy==${NUMPY_VERSION} cython==0.29.0
     INCLUDE_UI=1 PATH=/opt/python/${PYTHON}/bin:$PATH /opt/python/${PYTHON}/bin/python setup.py bdist_wheel
     # In the future, run auditwheel here.
     mv dist/*.whl ../.whl/