[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/wheel/metadata.py

@@ -5,8 +5,8 @@
 
 import functools
 import itertools
-import re
 import os.path
+import re
 import textwrap
 from email.message import Message
 from email.parser import Parser
@@ -16,7 +16,7 @@
 
 
 def _nonblank(str):
-    return str and not str.startswith('#')
+    return str and not str.startswith("#")
 
 
 @functools.singledispatch
@@ -72,14 +72,14 @@ def safe_extra(extra):
     Any runs of non-alphanumeric characters are replaced with a single '_',
     and the result is always lowercased.
     """
-    return re.sub('[^A-Za-z0-9.-]+', '_', extra).lower()
+    return re.sub("[^A-Za-z0-9.-]+", "_", extra).lower()
 
 
 def safe_name(name):
     """Convert an arbitrary string to a standard distribution name
     Any runs of non-alphanumeric/. characters are replaced with a single '-'.
     """
-    return re.sub('[^A-Za-z0-9.]+', '-', name)
+    return re.sub("[^A-Za-z0-9.]+", "-", name)
 
 
 def requires_to_requires_dist(requirement: Requirement) -> str: