python/qemu: delint; add flake8 config

Mostly, ignore the "no bare except" rule, because flake8 is not
contextual and cannot determine if we re-raise. Pylint can, though, so
always prefer pylint for that.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200528222129.23826-5-jsnow@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

python/qemu/.flake8

@@ -0,0 +1,2 @@
+[flake8]
+extend-ignore = E722  # Pylint handles this, but smarter.

python/qemu/accel.py

@@ -23,11 +23,12 @@
 # Mapping host architecture to any additional architectures it can
 # support which often includes its 32 bit cousin.
 ADDITIONAL_ARCHES = {
-    "x86_64" : "i386",
-    "aarch64" : "armhf",
-    "ppc64le" : "ppc64",
+    "x86_64": "i386",
+    "aarch64": "armhf",
+    "ppc64le": "ppc64",
 }
 
+
 def list_accel(qemu_bin):
     """
     List accelerators enabled in the QEMU binary.
@@ -47,6 +48,7 @@ def list_accel(qemu_bin):
     # Skip the first line which is the header.
     return [acc.strip() for acc in out.splitlines()[1:]]
 
+
 def kvm_available(target_arch=None, qemu_bin=None):
     """
     Check if KVM is available using the following heuristic:
@@ -69,6 +71,7 @@ def kvm_available(target_arch=None, qemu_bin=None):
         return False
     return True
 
+
 def tcg_available(qemu_bin):
     """
     Check if TCG is available.

python/qemu/machine.py

@@ -29,6 +29,7 @@
 
 LOG = logging.getLogger(__name__)
 
+
 class QEMUMachineError(Exception):
     """
     Exception called when an error in QEMUMachine happens.
@@ -62,7 +63,8 @@ class QEMUMachine:
     """
     A QEMU VM
 
-    Use this object as a context manager to ensure the QEMU process terminates::
+    Use this object as a context manager to ensure
+    the QEMU process terminates::
 
         with VM(binary) as vm:
             ...
@@ -185,8 +187,10 @@ def send_fd_scm(self, fd=None, file_path=None):
             fd_param.append(str(fd))
 
         devnull = open(os.path.devnull, 'rb')
-        proc = subprocess.Popen(fd_param, stdin=devnull, stdout=subprocess.PIPE,
-                                stderr=subprocess.STDOUT, close_fds=False)
+        proc = subprocess.Popen(
+            fd_param, stdin=devnull, stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT, close_fds=False
+        )
         output = proc.communicate()[0]
         if output:
             LOG.debug(output)
@@ -485,7 +489,8 @@ def event_wait(self, name, timeout=60.0, match=None):
 
     def events_wait(self, events, timeout=60.0):
         """
-        events_wait waits for and returns a named event from QMP with a timeout.
+        events_wait waits for and returns a named event
+        from QMP with a timeout.
 
         events: a sequence of (name, match_criteria) tuples.
                 The match criteria are optional and may be None.

python/qemu/qmp.py

@@ -168,8 +168,8 @@ def accept(self, timeout=15.0):
 
         @param timeout: timeout in seconds (nonnegative float number, or
                         None). The value passed will set the behavior of the
-                        underneath QMP socket as described in [1]. Default value
-                        is set to 15.0.
+                        underneath QMP socket as described in [1].
+                        Default value is set to 15.0.
         @return QMP greeting dict
         @raise OSError on socket connection errors
         @raise QMPConnectError if the greeting is not received