PythonDistribution -> inherit Target instead of PythonTarget

src/python/pants/backend/python/targets/python_distribution.py

@@ -12,15 +12,56 @@
 from pants.base.payload import Payload
 from pants.base.payload_field import PrimitiveField
 
-class PythonDistribution(PythonTarget):
+class PythonDistribution(Target):
   """A Python distribution.
 
   """
 
+  default_sources_globs = '*.py'
+
+  def __init__(self,
+               address=None,
+               payload=None,
+               sources=None,
+               compatibility=None,
+               **kwargs):
+  """
+  :param dependencies: The addresses of targets that this target depends on.
+    These dependencies may
+    be ``python_library``-like targets (``python_library``,
+    ``python_thrift_library``, ``python_antlr_library`` and so forth) or
+    ``python_requirement_library`` targets.
+  :type dependencies: list of strings
+  :param sources: Files to "include". Paths are relative to the
+    BUILD file's directory.
+  :type sources: ``Fileset`` or list of strings
+  :param resource_targets: The addresses of ``resources`` targets this target
+    depends on.
+  :param compatibility: either a string or list of strings that represents
+    interpreter compatibility for this target, using the Requirement-style
+    format, e.g. ``'CPython>=3', or just ['>=2.7','<3']`` for requirements
+    agnostic to interpreter class.
+  """
+  self.address = address
+  payload = payload or Payload()
+  payload.add_fields({
+    'sources': self.create_sources_field(sources, address.spec_path, key_arg='sources'),
+    'compatibility': PrimitiveField(maybe_list(compatibility or ())),
+  })
+  super(PythonDistribution, self).__init__(address=address, payload=payload, **kwargs)
+  self.add_labels('python')
+
+  # Check that the compatibility requirements are well-formed.
+  for req in self.payload.compatibility:
+    try:
+      PythonIdentity.parse_requirement(req)
+    except ValueError as e:
+      raise TargetDefinitionException(self, str(e))
+
+
   @classmethod
   def alias(cls):
-    return 'python_distribution'
-
+    return 'python_dist'
 
   def __init__(self, **kwargs):
     payload = Payload()