Merge pull request #1718 from blueyed/fix-funcarg_prefix_warning

Add punctuation to funcarg_prefix_warning

Author: nicoddemus

_pytest/fixtures.py

@@ -864,11 +864,12 @@ def yield_fixture(scope="function", params=None, autouse=False, ids=None, name=N
     else:
         return FixtureFunctionMarker(scope, params, autouse, ids=ids, name=name)
 
-defaultfuncargprefixmarker = fixture()
-funcarg_prefix_warning = '{name}: declaring fixtures using "pytest_funcarg__" prefix is deprecated ' \
-                         'and scheduled to be removed in pytest 4.0.\n' \
-                         'remove the prefix and use the @pytest.fixture decorator instead'
 
+defaultfuncargprefixmarker = fixture()
+funcarg_prefix_warning = (
+    '{name}: declaring fixtures using "pytest_funcarg__" prefix is deprecated '
+    'and scheduled to be removed in pytest 4.0.\n'
+    'Please remove the prefix and use the @pytest.fixture decorator instead.')
 
 
 @fixture(scope="session")
@@ -877,8 +878,6 @@ def pytestconfig(request):
     return request.config
 
 
-
-
 class FixtureManager:
     """
     pytest fixtures definitions and information is stored and managed