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Dictionaries
Official AQA 7517 section 4.2.7.
0
Objectives
5
Flashcards
7
Questions
36 min
Study time
AqaA LevelComputer ScienceFundamentals of data structures
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Dictionaries1 objectives
- Dictionaries: Be familiar with the concept of a dictionary. A collection of key-value pairs in which the value is accessed via the associated key. Be familiar with simple applications of dictionaries, for example information retrieval, and have experience of using a dictionary data structure in a programming language. Information retrieval: For example, the document 'The green, green grass grows' would be represented by the dictionary: {‘grass’: 1, ‘green’: 2, ‘grows’: 1, ‘the’: 1} ignoring letter case. 50
Key terms
DictionaryKey-value pair
Exam tips
- State what both parts represent: When explaining a dictionary used for word information, identify the words as keys and the occurrence totals as values.
Common mistakes
- Confusing a key with its value: "green" is the key and 2 is its associated value.
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