Move isidentifier to hy.lex

hy/_compat.py

@@ -2,7 +2,7 @@
 # This file is part of Hy, which is free software licensed under the Expat
 # license. See the LICENSE.
 
-import sys, keyword
+import sys
 
 PY3 = sys.version_info[0] >= 3
 PY36 = sys.version_info >= (3, 6)
@@ -15,11 +15,3 @@ def reraise(exc_type, value, traceback=None):
         raise value.with_traceback(traceback)
     finally:
         traceback = None
-
-
-def isidentifier(x):
-    if x in ('True', 'False', 'None'):
-        return True
-    if keyword.iskeyword(x):
-        return False
-    return x.isidentifier()

hy/lex/__init__.py

@@ -4,11 +4,11 @@
 
 from __future__ import unicode_literals
 
+import keyword
 import re
 import sys
 import unicodedata
 
-from hy._compat import isidentifier
 from hy.lex.exceptions import PrematureEndOfInput, LexException  # NOQA
 from hy.models import HyExpression, HySymbol
 
@@ -191,3 +191,11 @@ def read(from_file=sys.stdin, eof=""):
 
 def read_str(input):
     return read(StringIO(str(input)))
+
+
+def isidentifier(x):
+    if x in ('True', 'False', 'None'):
+        return True
+    if keyword.iskeyword(x):
+        return False
+    return x.isidentifier()