One other point that may be of help. When you're in France, you may find that it seems the place runs on coins. Clerks in stores often ask for exact, or near-exact, change. Machines may take coins but not bills. Anyway, it's easy to run out of coins after awhile.
You may wonder: where could I go to change this 5, 10, or 20 euro note into coins?
If you're from the U.S., you might wonder... a bank branch?
Nope. Few, if any, would do that.
Where you would need to go is to the Post Office (La Poste: look for the distinctive yellow sign). I was referred to one by a bank employee who looked at me as if I had a third hand growing from my forehead when I asked her to change a 10 note into a mix of 1- and 2-euro coins. That was on my second visit to France, and I was amazed when I went to the Post Office how helpful they were. Your experience may vary, but I wouldn't waste time with a bank. Most banking in France is done via ATMs and via direct payments arranged online. The folks in banks, in my experience, are there to handle banking problems for customers, arrange loans, set up accounts, and so forth. Not to, you know, handle actual icky money.