@@ -4,7 +4,6 @@
     MapRegion,
     MapRegionList,
     is_64_bit,
-    string_types,
     buffer,
 )
 
@@ -227,7 +226,7 @@ def fd(self):
 
         **Note:** it is not required to be valid anymore
         :raise ValueError: if the mapping was not created by a file descriptor"""
-        if isinstance(self._rlist.path_or_fd(), string_types()):
+        if isinstance(self._rlist.path_or_fd(), str):
             raise ValueError("File descriptor queried although mapping was generated from path")
         # END handle type
         return self._rlist.path_or_fd()
 
@@ -22,13 +22,6 @@ def buffer(obj, offset, size):
         # return obj[offset:offset + size]
 
 
-def string_types():
-    if sys.version_info[0] >= 3:
-        return str
-    else:
-        return basestring  # noqa: F821
-
-
 def align_to_mmap(num, round_up):
     """
     Align the given integer number to the closest page offset, which usually is 4096 bytes.
@@ -146,7 +139,7 @@ def __init__(self, path_or_fd, ofs, size, flags=0):
 
             self._size = len(self._mf)
         finally:
-            if isinstance(path_or_fd, string_types()):
+            if isinstance(path_or_fd, str):
                 os.close(fd)
             # END only close it if we opened it
         # END close file handle
@@ -229,7 +222,7 @@ def path_or_fd(self):
     def file_size(self):
         """:return: size of file we manager"""
         if self._file_size is None:
-            if isinstance(self._path_or_fd, string_types()):
+            if isinstance(self._path_or_fd, str):
                 self._file_size = os.stat(self._path_or_fd).st_size
             else:
                 self._file_size = os.fstat(self._path_or_fd).st_size