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what is a dictionary?

A dictionary also known as a Mapping is a way to keep key-value pairs, the values can be any Python object. I add tests to see which of the Python basic data types I can use as keys .

I think this is the most important data structure because it can hold all the other data structures, same as with lists and tuples. In programming I have had to work with JSON which I can read and write as dictionaries

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questions about dictionaries

Questions to think about as I go through the chapter

• what is a dictionary?

• how can I empty a dictionary?

• how can I copy a dictionary

• how can I make a dictionary from an iterable?

• how can I get a value that is in a dictionary?

• how can I look at the key-value pairs in a dictionary as a list of tuples?

• how can I look at only the keys in a dictionary?

• how can I remove a key-value pair from a dictionary?

• how can I remove the last key-value pair from a dictionary?

• how can I add a key with a default value to a dictionary?

• how can I update a dictionary?

• how can I add the key-value pairs from one dictionary to another?

• how can I look at only the values in a dictionary?

• what causes KeyError?

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the chapters

• dictionaries
• make a calculator 7

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code from the chapter

Do you want to see all the CODE I typed in these chapter?

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what is next?

• dictionaries

• how to make a calculator 7

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