Apply pylint to build/soong/bloaty

1. Run black --line-length 80 -S build/soong/bloaty
to fix formatting
2. Annotate # pylint: disable=import-error to skip checks for imports.
The imports are provided by Soong during m <target>

Test: m bloaty_merger_test
Test: pylint --rcfile tools/repohooks/tools/pylintrc
build/soong/bloaty/bloaty_merger.py
build/soong/bloaty/bloaty_merger_test.py
Bug: 195738175

Change-Id: I4579a80203de41d48992424f264dd1cdbafc854c

bloaty/bloaty_merger.py

@@ -24,12 +24,14 @@ import argparse
 import csv
 import gzip
 
+# pylint: disable=import-error
 import ninja_rsp
 
 import file_sections_pb2
 
 BLOATY_EXTENSION = ".bloaty.csv"
 
+
 def parse_csv(path):
     """Parses a Bloaty-generated CSV file into a protobuf.
 
@@ -43,7 +45,7 @@ def parse_csv(path):
     with open(path, newline='') as csv_file:
         file_proto = file_sections_pb2.File()
         if path.endswith(BLOATY_EXTENSION):
-      file_proto.path = path[:-len(BLOATY_EXTENSION)]
+            file_proto.path = path[: -len(BLOATY_EXTENSION)]
         section_reader = csv.DictReader(csv_file)
         for row in section_reader:
             section = file_proto.sections.add()
@@ -52,14 +54,15 @@ def parse_csv(path):
             section.file_size = int(row["filesize"])
     return file_proto
 
+
 def create_file_size_metrics(input_list, output_proto):
     """Creates a FileSizeMetrics proto from a list of CSV files.
 
     Args:
-    input_list: The path to the file which contains the list of CSV files. Each
-        filepath is separated by a space.
-    output_proto: The path for the output protobuf. It will be compressed using
-        gzip.
+      input_list: The path to the file which contains the list of CSV files.
+          Each filepath is separated by a space.
+      output_proto: The path for the output protobuf. It will be compressed
+          using gzip.
     """
     metrics = file_sections_pb2.FileSizeMetrics()
     reader = ninja_rsp.NinjaRspFileReader(input_list)
@@ -70,6 +73,7 @@ def create_file_size_metrics(input_list, output_proto):
     with gzip.open(output_proto, "wb") as output:
         output.write(metrics.SerializeToString())
 
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument("input_list_file", help="List of bloaty csv files.")
@@ -77,5 +81,6 @@ def main():
     args = parser.parse_args()
     create_file_size_metrics(args.input_list_file, args.output_proto)
 
+
 if __name__ == '__main__':
     main()

bloaty/bloaty_merger_test.py

@@ -14,6 +14,7 @@
 import gzip
 import unittest
 
+# pylint: disable=import-error
 from pyfakefs import fake_filesystem_unittest
 
 import bloaty_merger