dictionary_example.py

my_dictionary = {
    "A": 8,
    "B": 2,
    "C": 99,
    "D": 1,
    "E": 99,
    "F": None
}

print my_dictionary.values()
print my_dictionary.keys()

for key in my_dictionary:
    print key
    print my_dictionary[key]

def find(to_search, number):
    found_keys = []
    for key in my_dictionary:
        if my_dictionary[key] == number:
            found_keys.append(key)
    return found_keys

print find(my_dictionary, 1)
print find(my_dictionary, 99)
if len(find(my_dictionary, 6)) == 0:
    print "6 was not found!"
print find(my_dictionary, None)