allow parenthesized yield (generator-coroutines)

Author: asottile

pycodestyle.py

@@ -495,6 +495,7 @@ def missing_whitespace_after_keyword(logical_line, tokens):
                 tok0.string not in SINGLETONS and
                 tok0.string not in ('async', 'await') and
                 not (tok0.string == 'except' and tok1.string == '*') and
+                not (tok0.string == 'yield' and tok1.string == ')') and
                 tok1.string not in ':\n'):
             yield tok0.end, "E275 missing whitespace after keyword"
 

testsuite/E27.py

@@ -52,3 +52,7 @@
 #: E275:2:11
 if True:
     assert(1)
+#: Okay
+def f():
+    print((yield))
+    x = (yield)