Merge pull request #5575 from bluetech/mypy-initial

Add rudimentary mypy type checking

src/_pytest/_code/code.py

@@ -33,7 +33,8 @@ class Code:
     def __eq__(self, other):
         return self.raw == other.raw
 
-    __hash__ = None
+    # Ignore type because of https://github.com/python/mypy/issues/4266.
+    __hash__ = None  # type: ignore
 
     def __ne__(self, other):
         return not self == other
@@ -188,11 +189,11 @@ class TracebackEntry:
         """ path to the source code """
         return self.frame.code.path
 
-    def getlocals(self):
+    @property
+    def locals(self):
+        """ locals of underlaying frame """
         return self.frame.f_locals
 
-    locals = property(getlocals, None, None, "locals of underlaying frame")
-
     def getfirstlinesource(self):
         return self.frame.code.firstlineno
 
@@ -255,11 +256,11 @@ class TracebackEntry:
             line = "???"
         return "  File %r:%d in %s\n  %s\n" % (fn, self.lineno + 1, name, line)
 
+    @property
     def name(self):
+        """ co_name of underlaying code """
         return self.frame.code.raw.co_name
 
-    name = property(name, None, None, "co_name of underlaying code")
-
 
 class Traceback(list):
     """ Traceback objects encapsulate and offer higher level