Remove duplicate import and remove whitespace

pyqtgraph/__init__.py

@@ -395,7 +395,7 @@ def plot(*args, **kargs):
     Accepts a *title* argument to set the title of the window.
     All other arguments are used to plot data. (see :func:`PlotItem.plot() <pyqtgraph.PlotItem.plot>`)
     """
-    mkQApp()      
+    mkQApp()
     pwArgList = ['title', 'labels', 'name', 'left', 'right', 'top', 'bottom', 'background']
     pwArgs = {}
     dataArgs = {}

pyqtgraph/graphicsItems/PlotDataItem.py

@@ -9,7 +9,6 @@ from .ScatterPlotItem import ScatterPlotItem
 from .. import functions as fn
 from .. import debug as debug
 from .. import getConfigOption
-import warnings
 
 
 class PlotDataItem(GraphicsObject):