# print(), a function we've used several times already
for key in user_dict.keys():
    print(key, ":", user_dict[key])

# type(), getting the data type of a variable
for key in user_dict.keys():
    print(key, ":", type(user_dict[key]))

# len(), getting the length of a variable
for key in user_dict.keys():
    print(key, ":", len(user_dict[key]))
# TypeError: object of type 'int' has no len()