Hi Anand, I am able to found the way to update the Size column. Values are updated as expected in the column but the note book size is getting increased. I might be be doing something wrong in the looping. Please help me to solve this problem. Below is my code. def size_clearner(size): for x in ar['Size']: print ("Orignal x :", x) if 'M' in x: x = x.replace('M','') c = float (x) *1000 print ("converted x is :", c) elif 'k' in x: c = x.replace('k','') print("converted x is :", c) c = float (c) elif 'Varies with device' in x: c = x.replace('Varies with device','NA' ) print ("Varies with device :",c ) Thanks in advance !!