def sort_by_value(dict):
    '''

    '''

    age_sorted = sorted(dict.items(), key=lambda x:x[1])

    #print(age_sorted)

    return age_sorted

age = {
        'carl':40,
        'alan':2,
        'bob':1,
        'danny':3
    }

age_sorted = sort_by_value(age)

age_sorted

[('bob', 1), ('alan', 2), ('danny', 3), ('carl', 40)]