python: Apply Black formatter to Python files

The command executed was `black src configs tests util`.

Change-Id: I8dfaa6ab04658fea37618127d6ac19270028d771
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47024
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util/git-commit-msg.py

@@ -36,6 +36,7 @@ from maint.lib import maintainers
 
 from style.repo import GitRepo
 
+
 def _printErrorQuit(error_message):
     """
         Print an error message, followed my a help message and inform failure.
@@ -45,18 +46,26 @@ def _printErrorQuit(error_message):
     """
     print(error_message)
 
-    print("The commit has been cancelled, but a copy of it can be found in "
-          + sys.argv[1] + " : ")
+    print(
+        "The commit has been cancelled, but a copy of it can be found in "
+        + sys.argv[1]
+        + " : "
+    )
 
-    print("""
+    print(
+        """
 --------------------------------------------------------------------------
-    """)
+    """
+    )
     print(open(sys.argv[1], "r").read())
-    print("""
+    print(
+        """
 --------------------------------------------------------------------------
-    """)
+    """
+    )
 
-    print("""
+    print(
+        """
 The first line of a commit must contain one or more gem5 tags separated by
 commas (see MAINTAINERS.yaml for the possible tags), followed by a colon and
 a commit title. There must be no leading nor trailing whitespaces.
@@ -74,9 +83,11 @@ e.g.:
     mem,mem-cache: Improve packet class readability
 
     The packet class...
-""")
+"""
+    )
     sys.exit(1)
 
+
 def _validateTags(commit_header):
     """
         Check if all tags in the commit header belong to the list of valid
@@ -90,14 +101,15 @@ def _validateTags(commit_header):
     valid_tags = [tag for tag, _ in maintainer_dict]
 
     # Remove non-tag 'pmc' and add special tags not in MAINTAINERS.yaml
-    valid_tags.remove('pmc')
-    valid_tags.extend(['RFC', 'WIP'])
+    valid_tags.remove("pmc")
+    valid_tags.extend(["RFC", "WIP"])
 
-    tags = ''.join(commit_header.split(':')[0].split()).split(',')
-    if (any(tag not in valid_tags for tag in tags)):
+    tags = "".join(commit_header.split(":")[0].split()).split(",")
+    if any(tag not in valid_tags for tag in tags):
         invalid_tag = next((tag for tag in tags if tag not in valid_tags))
         _printErrorQuit("Invalid Gem5 tag: " + invalid_tag)
 
+
 # Go to git directory
 os.chdir(GitRepo().repo_base())
 
@@ -108,9 +120,10 @@ commit_message = open(sys.argv[1]).read()
 # a commit title
 commit_message_lines = commit_message.splitlines()
 commit_header = commit_message_lines[0]
-commit_header_match = \
-    re.search("^(fixup! )?(\S[\w\-][,\s*[\w\-]+]*:.+\S$)", commit_header)
-if ((commit_header_match is None)):
+commit_header_match = re.search(
+    "^(fixup! )?(\S[\w\-][,\s*[\w\-]+]*:.+\S$)", commit_header
+)
+if commit_header_match is None:
     _printErrorQuit("Invalid commit header")
 if commit_header_match.group(1) == "fixup! ":
     sys.exit(0)
@@ -119,21 +132,29 @@ _validateTags(commit_header_match.group(2))
 # Make sure commit title does not exceed threshold. This line is limited to
 # a smaller number because version control systems may add a prefix, causing
 # line-wrapping for longer lines
-commit_title = commit_header.split(':')[1]
+commit_title = commit_header.split(":")[1]
 max_header_size = 65
-if (len(commit_header) > max_header_size):
-    _printErrorQuit("The commit header (tags + title) is too long (" + \
-        str(len(commit_header)) + " > " + str(max_header_size) + ")")
+if len(commit_header) > max_header_size:
+    _printErrorQuit(
+        "The commit header (tags + title) is too long ("
+        + str(len(commit_header))
+        + " > "
+        + str(max_header_size)
+        + ")"
+    )
 
 # Then there must be at least one empty line between the commit header and
 # the commit description
-if (commit_message_lines[1] != ""):
-    _printErrorQuit("Please add an empty line between the commit title and " \
-        "its description")
+if commit_message_lines[1] != "":
+    _printErrorQuit(
+        "Please add an empty line between the commit title and "
+        "its description"
+    )
 
 # Encourage providing descriptions
-if (re.search("^(Signed-off-by|Change-Id|Reviewed-by):",
-    commit_message_lines[2])):
+if re.search(
+    "^(Signed-off-by|Change-Id|Reviewed-by):", commit_message_lines[2]
+):
     print("Warning: Commit does not have a description")
 
 sys.exit(0)