Looping over dicts

Once your data is in a dict, you'll often want to walk through every entry. Python gives you three clean ways to loop.

Loop over keys

By default, looping over a dict gives you its keys:

Python

prices = {"apple": 2, "banana": 1}
for key in prices:
    print(key)
# apple
# banana

Use .values() when you only care about the values:

Python

prices = {"apple": 2, "banana": 1}
for value in prices.values():
    print(value)
# 2
# 1

Use .items() to get both the key and the value at once:

Python

prices = {"apple": 2, "banana": 1}
for key, value in prices.items():
    print(key + ": " + str(value))
# apple: 2
# banana: 1

Note the str(value) — you must convert numbers to strings before joining them with +.