install dependencies

appveyor.yml

@@ -7,18 +7,28 @@ environment:
     # The list here is complete (excluding Python 2.6, which
     # isn't covered by this document) at the time of writing.
 
-    - PYTHON: "C:\\Python27"
-    - PYTHON: "C:\\Python33"
+#    - PYTHON: "C:\\Python27"
+#    - PYTHON: "C:\\Python33"
     - PYTHON: "C:\\Python34"
     - PYTHON: "C:\\Python35"
-    - PYTHON: "C:\\Python27-x64"
-    - PYTHON: "C:\\Python33-x64"
-      DISTUTILS_USE_SDK: "1"
+#    - PYTHON: "C:\\Python27-x64"
+#    - PYTHON: "C:\\Python33-x64"
+#      DISTUTILS_USE_SDK: "1"
     - PYTHON: "C:\\Python34-x64"
       DISTUTILS_USE_SDK: "1"
     - PYTHON: "C:\\Python35-x64"
 
-#install:
+install:
+  # Upgrade to the latest version of pip to avoid it displaying warnings
+  # about it being out of date.
+  - "pip install --disable-pip-version-check --user --upgrade pip"
+
+  # Install the build dependencies of the project. If some dependencies contain
+  # compiled extensions and are not provided as pre-built wheel packages,
+  # pip will build them from source using the MSVC compiler matching the
+  # target Python version and architecture
+  - "%CMD_IN_ENV% pip install -r dev-requirements.txt"
+
   # We need wheel installed to build wheels
 #  - "%PYTHON%\\python.exe -m pip install wheel"