Python3 Dictionary: Everything you need to know Cheat Sheet

ages = {"Dave": 24, "Mary": 42, "John": 58}
print(ages["Dave"])
print(ages["Mary"])
OR
primary = {
  "red": [255, 0, 0], 
  "green": [0, 255, 0], 
  "blue": [0, 0, 255], 
}

pairs = {1: "apple",
  "orange": [2, 3, 4], 
  True: False, 
  None: "True",
}

print(pairs.get("orange"))
print(pairs.get(7))
print(pairs.get(12345, "not in dictionary"))
...........
>>>
[2, 3, 4]
None
not in dictionary
>>>

squares = {1: 1, 2: 4, 3: "error", 4: 16,}
squares[8] = 64
squares[3] = 9
print(squares)
-----------------
{1: 1, 2: 4, 3: 9, 4: 16, 8: 64}

nums = {
  1: "one",
  2: "two",
  3: "three",
}
print(1 **in** nums)
print(4 **not in** nums)
print(**not** 4 **in** nums)
-----------------
True
True