MNT: Clean up deprecations

Author: effigies

nipype/interfaces/base/traits_extension.py

@@ -19,7 +19,7 @@
 (usually by Robert Kern).
 
 """
-from collections import Sequence
+from collections.abc import Sequence
 
 # perform all external trait imports here
 from traits import __version__ as traits_version

nipype/utils/misc.py

@@ -6,7 +6,7 @@
 import os
 import sys
 import re
-from collections import Iterator
+from collections.abc import Iterator
 from warnings import warn
 
 from distutils.version import LooseVersion
@@ -34,7 +34,7 @@ def atoi(text):
     def natural_keys(text):
         if isinstance(text, tuple):
             text = text[0]
-        return [atoi(c) for c in re.split("(\d+)", text)]
+        return [atoi(c) for c in re.split(r"(\d+)", text)]
 
     return sorted(l, key=natural_keys)