Pycharm无法正常运行脚本，而是在脚本中运行“ unittests”

我使用Pycharm Community Edition 3.4.1，我想运行wxpython的演示文件“ Dialog.py”。当我使用IDLE运行此脚本时，它运行正常。但是，当我尝试使用Pycharm运行它时，它不会像在IDLE中那样运行，而是尝试在脚本中运行“ unittests”（我不知道什么是unittest）：

脚本是：

import  wx

#---------------------------------------------------------------------------
# Create and set a help provider.  Normally you would do this in
# the app's OnInit as it must be done before any SetHelpText calls.
provider = wx.SimpleHelpProvider()
wx.HelpProvider.Set(provider)

#---------------------------------------------------------------------------

class TestDialog(wx.Dialog):
    def __init__(
            self, parent, ID, title, size=wx.DefaultSize, pos=wx.DefaultPosition, 
            style=wx.DEFAULT_DIALOG_STYLE,
            useMetal=False,
            ):

        # Instead of calling wx.Dialog.__init__ we precreate the dialog
        # so we can set an extra style that must be set before
        # creation, and then we create the GUI object using the Create
        # method.
        pre = wx.PreDialog()
        pre.SetExtraStyle(wx.DIALOG_EX_CONTEXTHELP)
        pre.Create(parent, ID, title, pos, size, style)

        # This next step is the most important, it turns this Python
        # object into the real wrapper of the dialog (instead of pre)
        # as far as the wxPython extension is concerned.
        self.PostCreate(pre)

        # This extra style can be set after the UI object has been created.
        if 'wxMac' in wx.PlatformInfo and useMetal:
            self.SetExtraStyle(wx.DIALOG_EX_METAL)


        # Now continue with the normal construction of the dialog
        # contents
        sizer = wx.BoxSizer(wx.VERTICAL)

        label = wx.StaticText(self, -1, "This is a wx.Dialog")
        label.SetHelpText("This is the help text for the label")
        sizer.Add(label, 0, wx.ALIGN_CENTRE|wx.ALL, 5)

        box = wx.BoxSizer(wx.HORIZONTAL)

        label = wx.StaticText(self, -1, "Field #1:")
        label.SetHelpText("This is the help text for the label")
        box.Add(label, 0, wx.ALIGN_CENTRE|wx.ALL, 5)

        text = wx.TextCtrl(self, -1, "", size=(80,-1))
        text.SetHelpText("Here's some help text for field #1")
        box.Add(text, 1, wx.ALIGN_CENTRE|wx.ALL, 5)

        sizer.Add(box, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.ALL, 5)

        box = wx.BoxSizer(wx.HORIZONTAL)

        label = wx.StaticText(self, -1, "Field #2:")
        label.SetHelpText("This is the help text for the label")
        box.Add(label, 0, wx.ALIGN_CENTRE|wx.ALL, 5)

        text = wx.TextCtrl(self, -1, "", size=(80,-1))
        text.SetHelpText("Here's some help text for field #2")
        box.Add(text, 1, wx.ALIGN_CENTRE|wx.ALL, 5)

        sizer.Add(box, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.ALL, 5)

        line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL)
        sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5)

        btnsizer = wx.StdDialogButtonSizer()

        if wx.Platform != "__WXMSW__":
            btn = wx.ContextHelpButton(self)
            btnsizer.AddButton(btn)

        btn = wx.Button(self, wx.ID_OK)
        btn.SetHelpText("The OK button completes the dialog")
        btn.SetDefault()
        btnsizer.AddButton(btn)

        btn = wx.Button(self, wx.ID_CANCEL)
        btn.SetHelpText("The Cancel button cancels the dialog. (Cool, huh?)")
        btnsizer.AddButton(btn)
        btnsizer.Realize()

        sizer.Add(btnsizer, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL, 5)

        self.SetSizer(sizer)
        sizer.Fit(self)

#---------------------------------------------------------------------------

class TestPanel(wx.Panel):
    def __init__(self, parent, log):
        self.log = log
        wx.Panel.__init__(self, parent, -1)

        b = wx.Button(self, -1, "Create and Show a custom Dialog", (50,50))
        self.Bind(wx.EVT_BUTTON, self.OnButton, b)

        if 'wxMac' in wx.PlatformInfo:
            self.cb = wx.CheckBox(self, -1, "Set Metal appearance", (50,90))


    def OnButton(self, evt):
        useMetal = False
        if 'wxMac' in wx.PlatformInfo:
            useMetal = self.cb.IsChecked()

        dlg = TestDialog(self, -1, "Sample Dialog", size=(350, 200),
                         #style=wx.CAPTION | wx.SYSTEM_MENU | wx.THICK_FRAME,
                         style=wx.DEFAULT_DIALOG_STYLE, # & ~wx.CLOSE_BOX,
                         useMetal=useMetal,
                         )
        dlg.CenterOnScreen()

        # this does not return until the dialog is closed.
        val = dlg.ShowModal()

        if val == wx.ID_OK:
            self.log.WriteText("You pressed OK\n")
        else:
            self.log.WriteText("You pressed Cancel\n")

        dlg.Destroy()


#---------------------------------------------------------------------------


def runTest(frame, nb, log):
    win = TestPanel(nb, log)
    return win


#---------------------------------------------------------------------------


overview = """\
wxPython offers quite a few general purpose dialogs for useful data input from
the user; they are all based on the wx.Dialog class, which you can also subclass
to create custom dialogs to suit your needs.

The Dialog class, in addition to dialog-like behaviors, also supports the full
wxWindows layout featureset, which means that you can incorporate sizers or
layout constraints as needed to achieve the look and feel desired. It even supports
context-sensitive help, which is illustrated in this example.

The example is very simple; in real world situations, a dialog that had input
fields such as this would no doubt be required to deliver those values back to
the calling function. The Dialog class supports data retrieval in this manner.
<b>However, the data must be retrieved prior to the dialog being destroyed.</b>
The example shown here is <i>modal</i>; non-modal dialogs are possible as well.

See the documentation for the <code>Dialog</code> class for more details.

"""

if __name__ == '__main__':
    import sys,os
    import run
    run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])

如何像使用IDLE一样使用Pycharm运行此文件？