dict dictionary
understanding:
The dictionary is a container, but it is disorderly
Thinking:
Ordered collection, data serial number can be found
Unordered container, to how we can find the data it
Understand disorderly container
Life unordered containers:
The figure is a point of delivery of the stack
This is equivalent to a stacking point container object
- Think
Dump sites stored in many courier objects
How to find the desired courier?
Dictionary details
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Dictionary defined by {}
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A dictionary is unordered container
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By storing key-value pairs
- Between the key and values: partition
- By a plurality of key-value pairs, separated
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The only key required
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Only key string, number, tuple type, the value may be any type
Dictionary operations
xiaoming = {"name": "小明",
"age": 18,
"gender": True,
"height": 1.75}
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Dictionary definitions
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Increased data
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delete data
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change the data
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Query data
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Code to achieve the functions described above
Dictionary traversal
Three ways to traverse the dictionary
In three cases the following example
xiaoming = {"name": "小明",
"age": 18,
"gender": True,
"height": 1.75}
A way to give key
- achieve
Second way to obtain the value
- achieve
Third approach, both the key and value
- achieve
