if whichSize=='1':
    #write a function that you can call to pick the font sizes
    #it will choose which font size it will be
elif whichSize=='2':
    #function call
elif whichSize=='3':
    #function call
elif whichSize=='4':
    #function call
elif whichSize=='5':
    #function call
elif whichSize=='6':
    #function call
elif whichSize=='7':
    #function call
else:
    print 'Invalid Input'