d = {
    'a': 1,
    'b': 2,
    'c': 'test'
}
print(d)
for item in d:
    print(item)
keys = d.keys()
for k in keys:
    print(k)
print(keys)

dd = {
    'list': [1, 2, 3],
    'len': 3
}
print(dd)