>>> d = {}
>>> d["teague"] = "math"
>>> d
{'teague': 'math'}
>>> d["avineri"] = "math"
>>> d["spells"] = "chem"
>>> d
{'teague': 'math', 'avineri': 'math', 'spells': 'chem'}
>>> # dictionary is a collectionof key-value pairs
>>> # keys must be hashable, values don't have to be.
>>> d["morrison"] = "math"
>>> d
{'teague': 'math', 'avineri': 'math', 'spells': 'chem', 'morrison': 'math'}
>>> d["morrison"] = "compsci"
>>> d
{'teague': 'math', 'avineri': 'math', 'spells': 'chem', 'morrison': 'compsci'}
>>> "aveneri" in d
False
>>> "avineri" in d
True
>>> #  quack in dict checkjs is quack is a key
>>> "math" in d.values()
True
>>> "spells" in d.keys()
True
>>> d.keys()
dict_keys(['teague', 'avineri', 'spells', 'morrison'])
>>> list(d.keys())
['teague', 'avineri', 'spells', 'morrison']
>>> for q in d.keys(): print( q)
... 
teague
avineri
spells
morrison
>>> type(None)
<class 'NoneType'>
>>> import random
>>> random.randint(1,6)
6
>>> random.randint(1,6)
5
>>> random.randint(1,6)
6
>>> random.randint(1,6)
1
>>> (random.randint(1,6),random.randint(1,6))
(1, 1)
>>> (random.randint(1,6),random.randint(1,6))
(6, 2)
>>> (random.randint(1,6),random.randint(1,6))
(4, 5)
>>> (random.randint(1,6),random.randint(1,6))
(2, 5)
>>> (random.randint(1,6),random.randint(1,6))
(4, 1)
>>> (random.randint(1,6),random.randint(1,6))
(2, 2)
>>> (random.randint(1,6),random.randint(1,6))
(1, 5)
>>>