Built-in Data Structures: Dictionaries

• A dictionary is an unordered collection of objects indexed by keys (known as a hash in perl -- that's what I called it last class)

• Any object can be a key

• Any object can be a item indexed by a key

• Dictionaries are mutable

• Examples

  {} Empty dictionary
  
  {'item':'tire','price':20.99} Two-element dictionary

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