Removed a bunch of code from _compat

flask/_compat.py

@@ -13,13 +13,10 @@
 import sys
 
 PY2 = sys.version_info[0] == 2
-PYPY = hasattr(sys, 'pypy_translation_info')
 _identity = lambda x: x
 
 
 if not PY2:
-    unichr = chr
-    range_type = range
     text_type = str
     string_types = (str,)
     integer_types = (int, )
@@ -28,29 +25,17 @@ if not PY2:
     itervalues = lambda d: iter(d.values())
     iteritems = lambda d: iter(d.items())
 
-    import pickle
-    from io import BytesIO, StringIO
-    NativeStringIO = StringIO
+    from io import StringIO
 
     def reraise(tp, value, tb=None):
         if value.__traceback__ is not tb:
             raise value.with_traceback(tb)
         raise value
 
-    ifilter = filter
-    imap = map
-    izip = zip
-    intern = sys.intern
-
-    implements_iterator = _identity
     implements_to_string = _identity
-    encode_filename = _identity
-    get_next = lambda x: x.__next__
 
 else:
-    unichr = unichr
     text_type = unicode
-    range_type = xrange
     string_types = (str, unicode)
     integer_types = (int, long)
 
@@ -58,32 +43,15 @@ else:
     itervalues = lambda d: d.itervalues()
     iteritems = lambda d: d.iteritems()
 
-    import cPickle as pickle
-    from cStringIO import StringIO as BytesIO, StringIO
-    NativeStringIO = BytesIO
+    from cStringIO import StringIO as StringIO
 
     exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')
 
-    from itertools import imap, izip, ifilter
-    intern = intern
-
-    def implements_iterator(cls):
-        cls.next = cls.__next__
-        del cls.__next__
-        return cls
-
     def implements_to_string(cls):
         cls.__unicode__ = cls.__str__
         cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
         return cls
 
-    get_next = lambda x: x.next
-
-    def encode_filename(filename):
-        if isinstance(filename, unicode):
-            return filename.encode('utf-8')
-        return filename
-
 
 def with_metaclass(meta, *bases):
     # This requires a bit of explanation: the basic idea is to make a
@@ -103,9 +71,3 @@ def with_metaclass(meta, *bases):
                 return type.__new__(cls, name, (), d)
             return meta(name, bases, d)
     return metaclass('temporary_class', None, {})
-
-
-try:
-    from urllib.parse import quote_from_bytes as url_quote
-except ImportError:
-    from urllib import quote as url_quote