Python基础 · free preview
Dictionaries and Sets
Store pairs of data in dictionaries; look values up by key, count with them, and work with sets of unique values.
1. Overview
Overview
2. Looking Things Up by Name
Looking Things Up by Name
3. Adding and Changing Entries
Adding and Changing Entries
4. Looping Over a Dictionary
Looping Over a Dictionary
5. Counting Things
Counting Things
6. Sets of Unique Values
Sets of Unique Values
7. Counting Vowels
Counting Vowels
8. Shared Symptoms
Shared Symptoms
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