appveyor.yml unnecessarily complicated

appveyor.yml

@@ -3,79 +3,79 @@ environment:
     # SDK v7.0 MSVC Express 2008's SetEnv.cmd script will fail if the
     # /E:ON and /V:ON options are not enabled in the batch script intepreter
     # See: http://stackoverflow.com/a/13751649/163740
-    CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\appveyor\\run_with_env.cmd"
+    CMD_IN_ENV: cmd /E:ON /V:ON /C .\appveyor\run_with_env.cmd
 
   matrix:
 
     # Python 2.7.10 is the latest version and is not pre-installed.
 
-    - PYTHON: "C:\\Python27.10"
-      PYTHON_VERSION: "2.7.10"
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python27.10
+      PYTHON_VERSION: 2.7.10
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python27.10-x64"
-      PYTHON_VERSION: "2.7.10"
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python27.10-x64
+      PYTHON_VERSION: 2.7.10
+      PYTHON_ARCH: '64'
 
     # Pre-installed Python versions, which Appveyor may upgrade to
     # a later point release.
     # See: http://www.appveyor.com/docs/installed-software#python
 
-    - PYTHON: "C:\\Python27"
-      PYTHON_VERSION: "2.7.x" # currently 2.7.9
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python27
+      PYTHON_VERSION: 2.7.x # currently 2.7.9
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python27-x64"
-      PYTHON_VERSION: "2.7.x" # currently 2.7.9
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python27-x64
+      PYTHON_VERSION: 2.7.x # currently 2.7.9
+      PYTHON_ARCH: '64'
 
-    - PYTHON: "C:\\Python33"
-      PYTHON_VERSION: "3.3.x" # currently 3.3.5
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python33
+      PYTHON_VERSION: 3.3.x # currently 3.3.5
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python33-x64"
-      PYTHON_VERSION: "3.3.x" # currently 3.3.5
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python33-x64
+      PYTHON_VERSION: 3.3.x # currently 3.3.5
+      PYTHON_ARCH: '64'
 
-    - PYTHON: "C:\\Python34"
-      PYTHON_VERSION: "3.4.x" # currently 3.4.3
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python34
+      PYTHON_VERSION: 3.4.x # currently 3.4.3
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python34-x64"
-      PYTHON_VERSION: "3.4.x" # currently 3.4.3
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python34-x64
+      PYTHON_VERSION: 3.4.x # currently 3.4.3
+      PYTHON_ARCH: '64'
 
     # Python versions not pre-installed
 
     # Python 2.6.6 is the latest Python 2.6 with a Windows installer
     # See: https://github.com/ogrisel/python-appveyor-demo/issues/10
 
-    - PYTHON: "C:\\Python266"
-      PYTHON_VERSION: "2.6.6"
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python266
+      PYTHON_VERSION: 2.6.6
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python266-x64"
-      PYTHON_VERSION: "2.6.6"
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python266-x64
+      PYTHON_VERSION: 2.6.6
+      PYTHON_ARCH: '64'
 
-    - PYTHON: "C:\\Python35"
-      PYTHON_VERSION: "3.5.0"
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python35
+      PYTHON_VERSION: 3.5.0
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python35-x64"
-      PYTHON_VERSION: "3.5.0"
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python35-x64
+      PYTHON_VERSION: 3.5.0
+      PYTHON_ARCH: '64'
 
     # Major and minor releases (i.e x.0.0 and x.y.0) prior to 3.3.0 use
     # a different naming scheme.
 
-    - PYTHON: "C:\\Python270"
-      PYTHON_VERSION: "2.7.0"
-      PYTHON_ARCH: "32"
+    - PYTHON: C:\Python270
+      PYTHON_VERSION: 2.7.0
+      PYTHON_ARCH: '32'
 
-    - PYTHON: "C:\\Python270-x64"
-      PYTHON_VERSION: "2.7.0"
-      PYTHON_ARCH: "64"
+    - PYTHON: C:\Python270-x64
+      PYTHON_VERSION: 2.7.0
+      PYTHON_ARCH: '64'
 
 install:
   # If there is a newer build queued for the same PR, cancel this one.
@@ -88,10 +88,10 @@ install:
         Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
           throw "There are newer queued builds for this pull request, failing early." }
   - ECHO "Filesystem root:"
-  - ps: "ls \"C:/\""
+  - ps: ls "C:/"
 
   - ECHO "Installed SDKs:"
-  - ps: "ls \"C:/Program Files/Microsoft SDKs/Windows\""
+  - ps: ls "C:/Program Files/Microsoft SDKs/Windows"
 
   # Install Python (from the official .msi of http://python.org) and pip when
   # not already installed.
@@ -100,36 +100,36 @@ install:
   # Prepend newly installed Python to the PATH of this build (this cannot be
   # done from inside the powershell script as it would require to restart
   # the parent CMD process).
-  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
+  - SET PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
 
   # Check that we have the expected version and architecture for Python
-  - "python --version"
-  - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
+  - python --version
+  - python -c "import struct; print(struct.calcsize('P') * 8)"
 
   # Upgrade to the latest version of pip to avoid it displaying warnings
   # about it being out of date.
-  - "python -m pip install --upgrade pip"
+  - python -m pip install --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"
+  - '%CMD_IN_ENV% pip install -r dev-requirements.txt'  # % cannot occur at the start of an unquoted scalar
 
 build_script:
   # Build the compiled extension
-  - "%CMD_IN_ENV% python setup.py build"
+  - '%CMD_IN_ENV% python setup.py build'
 
 test_script:
   # Run the project tests
-  - "%CMD_IN_ENV% python setup.py nosetests"
+  - '%CMD_IN_ENV% python setup.py nosetests'
 
 after_test:
   # If tests are successful, create binary packages for the project.
-  - "%CMD_IN_ENV% python setup.py bdist_wheel"
-  - "%CMD_IN_ENV% python setup.py bdist_wininst"
-  - "%CMD_IN_ENV% python setup.py bdist_msi"
-  - ps: "ls dist"
+  - '%CMD_IN_ENV% python setup.py bdist_wheel'
+  - '%CMD_IN_ENV% python setup.py bdist_wininst'
+  - '%CMD_IN_ENV% python setup.py bdist_msi'
+  - ps: ls dist
 
 artifacts:
   # Archive the generated packages in the ci.appveyor.com build report.