bpo-35202: Remove unused imports in Lib directory. (GH-10445)

Lib/shutil.py

@@ -10,7 +10,6 @@ import stat
 import fnmatch
 import collections
 import errno
-import io
 
 try:
     import zlib

Lib/trace.py

@@ -51,7 +51,6 @@ __all__ = ['Trace', 'CoverageResults']
 
 import linecache
 import os
-import re
 import sys
 import token
 import tokenize

Lib/typing.py

@@ -18,7 +18,6 @@ At large scale, the structure of the module is following:
 * Wrapper submodules for re and io related types.
 """
 
-import abc
 from abc import abstractmethod, abstractproperty
 import collections
 import collections.abc