Add default Python 2 install on Windows to search (#4048)

* Add default Python 2 install on Windows

* install typing on Python2 on AppVeyor

Author: emmatyping

appveyor.yml

@@ -12,6 +12,7 @@ install:
     - "git config core.symlinks true"
     - "git reset --hard"
     - "%PYTHON%\\python.exe -m pip install -r test-requirements.txt"
+    - "C:\\Python27\\python.exe -m pip install typing"
     - "git submodule update --init typeshed"
     - "cd typeshed && git config core.symlinks true && git reset --hard && cd .."
     - "%PYTHON%\\python.exe -m pip install ."

mypy/util.py

@@ -10,7 +10,7 @@
 
 ENCODING_RE = re.compile(br'([ \t\v]*#.*(\r\n?|\n))??[ \t\v]*#.*coding[:=][ \t]*([-\w.]+)')
 
-default_python2_interpreter = ['python2', 'python', '/usr/bin/python']
+default_python2_interpreter = ['python2', 'python', '/usr/bin/python', 'C:\\Python27\\python.exe']
 
 
 def split_module_names(mod_name: str) -> List[str]: