python Tkinter: passing an argument to a function

Can please anyone help me with my problem. I am new to python and I can not get how to pass an argument to a function in the following case: In a separate file (sentiment_analysis) I have a dictionary and an array of objects: ``` positiveSentiments = dict() // here are some words related to each of the object objects = ['Google', 'Apple', 'Motorola'] ``` I need to display positive sentiments of each object: ``` def onButtonPosObject(p): for key in sentiment_analysis.positiveSentiments.keys(): if key == p: text.insert(END, sentiment_analysis.positiveSentiments[key]) submenu = Menu(text, tearoff=0) for p in sentiment_analysis.objects: submenu.add_command(label=p, command = lambda : onButtonPosObject(p), underline=0) textmenu.add_cascade(label='Display positive sentiments', menu=submenu, underline=0) ``` I think I have to pass a value of label (p) as a parameter of onButtonPosObject() function and I need to get a list of words from positiveSentiments dictionary for every object but I get empty value like []. I would be very grateful for any recommendations!