Python Learning Dict (dictionary) type and set type

To create a dictionary type:

Zidian = {} or Zidian = Dict ()

[]: Use the index inside square brackets

Len (Zidian): Number of test key-value pairs

In: Whether the key is in the dictionary, returns a Boolean value

Dictionary method:

Items (): A list of tuples for all key-value pairs

Keys (): List of all keys

VALUES (): All Worthwhile lists

Copy (): Shallow copy Dictionary

To create a set type:

Nullset=set ()

Dictionary method:

Len (); Number of elements

Intersection: Create a new collection, take the same part of the two collection intersection () such as Aset.intersection (Bset)

Aset.union: Create a new collection, remove all elements of two collection (Bset)

Difference set: Aset.difference (Bset)

Symmetry difference: Remove elements that are not shared in the two collection symmetric_difference

Subset and superset: Aset.issubset (Bset), Aset.issuperset (Bset) return value is Boolean

Add (Element)

Clear (): Empty

Remove (Element) and discard (element): Deletes the elements. element does not exist remove error, discard () does not

Copy (): Shallow copy

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Python Learning Dict (dictionary) type and set type