1 files changed, 15 insertions, 7 deletions
diff --git a/exec_utils.py b/exec_utils.py
index c1dbdcb..0163107 100644
--- a/exec_utils.py
+++ b/exec_utils.py
@@ -12,7 +12,9 @@ from typing import List, Optional
 logger = logging.getLogger(__file__)
 
 
-def cmd_showing_output(command: str, ) -> int:
+def cmd_showing_output(
+    command: str,
+) -> int:
     """Kick off a child process.  Capture and print all output that it
     produces on stdout and stderr.  Wait for the subprocess to exit
     and return the exit value as the return code of this function.
@@ -119,25 +121,30 @@ def run_silently(command: str, timeout_seconds: Optional[float] = None) -> None:
 
 
 def cmd_in_background(
-        command: str, *, silent: bool = False
+    command: str, *, silent: bool = False
 ) -> subprocess.Popen:
     args = shlex.split(command)
     if silent:
-        subproc = subprocess.Popen(args,
-                                   stdin=subprocess.DEVNULL,
-                                   stdout=subprocess.DEVNULL,
-                                   stderr=subprocess.DEVNULL)
+        subproc = subprocess.Popen(
+            args,
+            stdin=subprocess.DEVNULL,
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+        )
     else:
         subproc = subprocess.Popen(args, stdin=subprocess.DEVNULL)
 
     def kill_subproc() -> None:
         try:
             if subproc.poll() is None:
-                logger.info("At exit handler: killing {}: {}".format(subproc, command))
+                logger.info(
+                    "At exit handler: killing {}: {}".format(subproc, command)
+                )
                 subproc.terminate()
                 subproc.wait(timeout=10.0)
         except BaseException as be:
             logger.exception(be)
+
     atexit.register(kill_subproc)
     return subproc
 
@@ -152,4 +159,5 @@ def cmd_list(command: List[str]) -> str:
 
 if __name__ == '__main__':
     import doctest
+
     doctest.testmod()