cps6-111101 - CompSci 6 Introduction to Computer Science...

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CompSci 6 Introduction to Computer Science November 1, 2011 Prof. Rodger
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Announcements No Reading for next time, no RQ Apt-04 out, due Thursday • Today – Writing Dictionaries/maps – Solving one apt EmailsCourse
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Dictionaries/Maps Dictionaries/maps are another way of organizing data Keys and Values – Each key maps to a value – Some keys can map to the same value – Can change the value a key maps to
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Example Each student could be mapped to their favorite ice cream flavor
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Implementing a Dictionary/Map Keys map to values Create Empty dictionary somemap = {} Put in a key and its value somemap[“Forbes”] = “Strawberry” Get a value for a dictionary value = somemap[“Forbes”] OR value = somemap.get(“Forbes”, “default”) Change a value for a dictionary somemap[“Forbes’] = “Chocolate”
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More on using a Dictionary/Map Get all the keys – listKeys = somemap.keys() Get all the values – listValues = somemap.values() Other methods – clear –
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