ui problem

#
#USER Interface creation for Maya
#

from PyQt4 import QtGui, QtCore, uic
from pymel.core import *
import pymel.core as pm
from pymel import *
import maya.cmds as cmds
from functools import partial

#Path to the designer UI file
ui_filename = r'C:\Users\Kartik\Desktop\Downloads\test_ui.ui'
form_class, base_class = uic.loadUiType(ui_filename)

#Interface class
class masterScript_ui (base_class, form_class):
    def __init__(self):
        super(base_class, self).__init__()
        self.setupUi(self)
        self.setObjectName('masterScript_ui')
        self.setDockNestingEnabled(True)
        self.connectInterface()

    def connectInterface(self):
        QtCore.QObject.connect(self.SelectionVertex, QtCore.SIGNAL("clicked()"),self.SelectionVertexWin)
        QtCore.QObject.connect(self.SelectionEdge, QtCore.SIGNAL("clicked()"),self.SelectionEdgeWin)
        #QtCore.QObject.connect(self.SelectionBorder, QtCore.SIGNAL("clicked()"),self.SelectionBorderWin)
        QtCore.QObject.connect(self.SelectionPolygon, QtCore.SIGNAL("clicked()"),self.SelectionPolygonWin)
        QtCore.QObject.connect(self.SelectionElement, QtCore.SIGNAL("clicked()"),self.SelectionElementWin)

    def SelectionVertexWin(self):
        mel.eval('global proc SelectionVertex(){SelectVertexMask;}')
        mel.SelectionVertex()

    def SelectionEdgeWin(self):
        mel.eval('global proc SelectionEdge(){SelectEdgeMask;}')
        mel.SelectionEdge()

    def SelectionBorderWin(self): # I unintended it for now for consistency
        mel.eval('global proc SelectionBorder(){SelectEdgeMask;}')
        mel.SelectionBorder()

    def SelectionPolygonWin(self):
        mel.eval('global proc SelectionPolygon(){SelectFacetMask;}')
        mel.SelectionPolygon()

    def SelectionElementWin(self):
        mel.eval('global proc SelectionElement(){SelectToggleMode;}')
        mel.SelectionElement()



#main
def main():
    global ui
    ui=masterScript_ui()
    ui.show()

if __name__== "__main__":
    main()