Python zero-based introduction to ten collections

First remember several characteristics of sets: sets are unordered, and the elements in the set are unique.
1. The definition of a set
The definition of a set is very similar to a dictionary, except that the key-value pairs in the dictionary are converted into elements.

num={1,2,3,4,5}
print(type(num))
print(num)
print("\n")
#集合会自动剔除重复的数据，并且集合也是无序的
num2={1,2,3,4,5,5,4,32}
print(num2)
print("\n")

#2. Creation of collections
(1) Use the definition method
(2) Use the set() factory function

set1=set([1,2,3,4,5,6])
print(set1)

3. Commonly used functions of collections
(1)add() function: Add functions to the collection
(2)remove() function: Remove elements from the collection
( 3) Use frozenset() to create an unmodifiable collection: Once a collection is created, the collection cannot be modified, otherwise an exception will occur

num3=frozenset([1,2,3,4,5])
num3.add(6)

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