NOTE: Switzerland is NOT Euro zone. If you are passing through as you leave Italy, they have their own currency (and passport check). Some stores on the border will take either, but better to use the local currency because their conversion is not as friendly as banks. Likewise, when shopping or dining and they ask if you want it in the local currency or US$, you always want the local currency and let the credit card do the conversion. While you can use bank ATM's for cash - and I did in Italy and Spain - in Switzerland, my favorite ATM is Postal which is part of their postal system and a mustard yellow in color. I've noticed when they are side by side with bank ATM's, locals tend to prefer Postal as well. One note when using the ATM, it tends to default to large bill, so 500CHF would be dispensed as five 100chf bills. There is a second button to remember to push to get smaller 20 and 50 CHF denominations.
Another thing to be aware of, the price - sometimes in print and always when handwritten - the "1" looks like a "7" (curved upstroke and down) where "7" has a second slash through it. The good news is handwritten prices are quite legible with more formal printing style - not American scribble. I have some pictures in the Barcelona market but unfortunately don't have both on the same picture to illustrate. For groceries, almost always bring your own shopping bag (stretch nylon bag that rolls up for easy compact carry is ideal). Likewise, with fruit and vegetables, it is usually open stock with a code number. Take them to the scale, enter the code number and it spits out the price tag. They do have light weight tear-off plastic bags for quantity, like apples, but bunches, like bananas, just stick to the banana.