A couple of 3.6 bugs...

remove parens around decorators by adjusting precidence
Partial handling of quotes within 3.6 format strings

test/simple_source/bug36/01_fstring.py

@@ -1,5 +1,18 @@
+# Self-checking 3.6+ string interpolation tests
+
 var1 = 'x'
 var2 = 'y'
-print(f'interpolate {var1} strings {var2!r} {var2!s} py36')
+abc  = 'def'
-print(f'{abc}0')
+assert (f'interpolate {var1} strings {var2!r} {var2!s} py36' ==
-print(f'{abc}{abc!s}')
+        "interpolate x strings 'y' y py36")
+assert 'def0' == f'{abc}0'
+assert 'defdef' == f'{abc}{abc!s}'
+
+# From 3.6 functools.py
+# Bug was handling format operator strings.
+
+k, v = "1", ["2"]
+x = f"{k}={v!r}"
+y = f"functools.{x}({', '.join(v)})"
+assert x == "1=['2']"
+assert y == "functools.1=['2'](2)"

test/simple_source/bug36/02_kwargs.py

@@ -1,5 +1,13 @@
 # From 3.6 _markupbase _parse_doctype_subset()
-def bug(self, j):
+def bug(self, j, a, b):
     self.parse_comment(j, report=0)
     self.parse_comment(j, report=1, foo=2)
     self.parse_comment(a, b, report=3)
+
+# From 3.6 fnmatch.py
+# Bug was precidence parenthesis around decorator
+
+import functools
+@functools.lru_cache(maxsize=256, typed=True)
+def _compile_pattern(pat):
+    pass

uncompyle6/semantics/consts.py

@@ -317,6 +317,10 @@ MAP = {
 # See https://docs.python.org/2/reference/expressions.html
 # or https://docs.python.org/3/reference/expressions.html
 # for a list.
+
+# Things at the top of this list below with low-value precidence will
+# tend to have parenthesis around them. Things at the bottom
+# of the list will tend not to have parenthesis around them.
 PRECEDENCE = {
     'list':                 0,
     'dict':                 0,
@@ -377,8 +381,9 @@ PRECEDENCE = {
     'ret_cond_not':         28,
 
     '_mklambda':            30,
-    'yield':                101,
+    'call_kw':             100,  # 100 seems to to be module/function precidence
-    'yield_from':           101
+    'yield':               101,
+    'yield_from':          101
 }
 
 ASSIGN_TUPLE_PARAM = lambda param_name: \

uncompyle6/semantics/customize.py

@@ -357,8 +357,10 @@ def customize_for_version(self, is_pypy, version):
                     'tryfinally36':  ( '%|try:\n%+%c%-%|finally:\n%+%c%-\n\n',
                                        (1, 'returns'), 3 ),
                     'fstring_expr':   ( "{%c%{conversion}}", 0),
-                    'fstring_single': ( "f'{%c%{conversion}}'", 0),
+                    # FIXME: the below assumes the format strings
-                    'fstring_multi':  ( "f'%c'", 0),
+                    # don't have ''' in them. Fix this properly
+                    'fstring_single': ( "f'''{%c%{conversion}}'''", 0),
+                    'fstring_multi':  ( "f'''%c'''", 0),
                     'func_args36':    ( "%c(**", 0),
                     'try_except36':   ( '%|try:\n%+%c%-%c\n\n', 1, 2 ),
                     'unpack_list':    ( '*%c', (0, 'list') ),
@@ -603,6 +605,14 @@ def customize_for_version(self, is_pypy, version):
 
                 FSTRING_CONVERSION_MAP = {1: '!s', 2: '!r', 3: '!a'}
 
+                def n_formatted_value(node):
+                    if node[0] == 'LOAD_CONST':
+                        self.write(node[0].attr)
+                        self.prune()
+                    else:
+                        self.default(node)
+                self.n_formatted_value = n_formatted_value
+
                 def f_conversion(node):
                     node.conversion = FSTRING_CONVERSION_MAP.get(node.data[1].attr, '')