refactor: remove unneeded backward.py shims

Removed were:

- StringIO
- configparser
- string_class
- unicode_class
- range
- zip_longest
- get_thread_id
- path_types
- shlex_quote
- reprlib

1 files changed, 3 insertions, 3 deletions

diff --git a/coverage/misc.py b/coverage/misc.py
index 44d1cdf8..148f42e1 100644
--- a/coverage/misc.py
+++ b/coverage/misc.py
@@ -16,7 +16,7 @@ import sys
 import types
 
 from coverage import env
-from coverage.backward import to_bytes, unicode_class
+from coverage.backward import to_bytes
 
 ISOLATED_MODULES = {}
 
@@ -71,7 +71,7 @@ if USE_CONTRACTS:
 
     # Define contract words that PyContract doesn't have.
     new_contract('bytes', lambda v: isinstance(v, bytes))
-    new_contract('unicode', lambda v: isinstance(v, unicode_class))
+    new_contract('unicode', lambda v: isinstance(v, str))
 
     def one_of(argnames):
         """Ensure that only one of the argnames is non-None."""
@@ -204,7 +204,7 @@ class Hasher(object):
     def update(self, v):
         """Add `v` to the hash, recursively if needed."""
         self.md5.update(to_bytes(str(type(v))))
-        if isinstance(v, unicode_class):
+        if isinstance(v, str):
             self.md5.update(v.encode('utf8'))
         elif isinstance(v, bytes):
             self.md5.update(v)