Remove mutable default arg value

pyblish_qml/app.py

@@ -76,7 +76,7 @@ class Application(QtGui.QGuiApplication):
  inFocused = QtCore.pyqtSignal()
  outFocused = QtCore.pyqtSignal()
 
- def __init__(self, source, targets=[]):
+ def __init__(self, source, targets=None):
  super(Application, self).__init__(sys.argv)
 
  self.setWindowIcon(QtGui.QIcon(ICON_PATH))
@@ -281,7 +281,7 @@ def _listen():
  thread.start()
 
 
-def main(demo=False, aschild=False, targets=[]):
+def main(demo=False, aschild=False, targets=None):
  """Start the Qt-runtime and show the window
 
  Arguments:

pyblish_qml/control.py

@@ -61,13 +61,13 @@ class Controller(QtCore.QObject):
  resultModel = qtproperty(lambda self: self.data["models"]["result"])
  resultProxy = qtproperty(lambda self: self.data["proxies"]["result"])
 
- def __init__(self, host, parent=None, targets=[]):
+ def __init__(self, host, parent=None, targets=None):
  super(Controller, self).__init__(parent)
 
  # Connection to host
  self.host = host
 
- self.targets = targets
+ self.targets = targets or []
 
  self.data = {
  "models": {
@@ -984,7 +984,7 @@ def on_finished():
 
  util.defer(get_data, callback=on_data_received)
 
- def run(self, plugins, context, callback=None, callback_args=[]):
+ def run(self, plugins, context, callback=None, callback_args=None):
  """Commence asynchronous tasks
 
  This method runs through the provided `plugins` in
@@ -1001,6 +1001,7 @@ def run(self, plugins, context, callback=None, callback_args=[]):
  callback_args (list, optional): Arguments passed to callback
 
  """
+ callback_args = callback_args or []
 
  # if "ready" not in self.states:
  # return self.error.emit("Not ready")