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Dictionaries

Dictionaries. Dictionaries. Allow you to retrieve data using a key (instead of an index). Classic dictionary: Search/retrieve using a word Get the definition of the word Python dictionary: Retrieve using a key Get data associated with the key. Creating a dictionary.

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Dictionaries

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  1. Dictionaries

  2. Dictionaries • Allow you to retrieve data using a key (instead of an index). • Classic dictionary: • Search/retrieve using a word • Get the definition of the word • Python dictionary: • Retrieve using a key • Get data associated with the key

  3. Creating a dictionary • students = {‘Joe’:[CPSC231,MATH271],’Katie:[PSYC205,ENGL201]} • dict = {}

  4. Adding and Retrieving Values • students[‘Bob’] = [CPSC231,PHIL279] • x = students[‘Joe’]

  5. Keys • Type must be immutable • Strings • Integers • Tuples • etc • Keys in a dictionary must be unique

  6. Methods • clear • get • items • keys • values

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