AttributeError chaining bug #1944 fix

AUTHORS

@@ -78,6 +78,7 @@ Kale Kundert
 Katarzyna Jachim
 Kevin Cox
 Lee Kamentsky
+Lev Maximov
 Lukas Bednar
 Maciek Fijalkowski
 Maho

CHANGELOG.rst

@@ -12,14 +12,20 @@
 * Fix pkg_resources import error in Jython projects (`#1853`).
   Thanks `@raquel-ucl`_ for the PR.
 
+* Got rid of ``AttributeError: 'Module' object has no attribute '_obj'`` exception
+  in Python 3 (`#1944`_).
+  Thanks `@axil`_ for the PR.
+
 *
 
 
 .. _@philpep: https://github.com/philpep
 .. _@raquel-ucl: https://github.com/raquel-ucl
+.. _@axil: https://github.com/axil
 
 .. _#1905: https://github.com/pytest-dev/pytest/issues/1905
 .. _#1934: https://github.com/pytest-dev/pytest/issues/1934
+.. _#1944: https://github.com/pytest-dev/pytest/issues/1944
 
 
 3.0.2

_pytest/python.py

@@ -205,11 +205,10 @@ class PyobjContext(object):
 class PyobjMixin(PyobjContext):
     def obj():
         def fget(self):
-            try:
-                return self._obj
-            except AttributeError:
+            obj = getattr(self, '_obj', None)
+            if obj is None:
                 self._obj = obj = self._getobj()
-                return obj
+            return obj
         def fset(self, value):
             self._obj = value
         return property(fget, fset, None, "underlying python object")

testing/test_assertion.py

@@ -864,3 +864,15 @@ def test_unicode():
     """)
     result = testdir.runpytest()
     result.stdout.fnmatch_lines(['*AssertionError*'])
+
+def test_issue_1944(testdir):
+    testdir.makepyfile("""
+        def f():
+            return
+
+        assert f() == 10
+    """)
+    result = testdir.runpytest()
+    result.stdout.fnmatch_lines(["*1 error*"])
+    assert "AttributeError: 'Module' object has no attribute '_obj'" not in result.stdout.str()
+