Python可变集合和不可变集合的构造方法大全

str1 = 'pythonpython'  # 不可变，有序：可以通过下标访问
list1 = [1, 2, 3, 2]  # 可变，有序：可以通过下标访问
tup1 = (1, 2, 3, 2)  # 不可变，有序：可以通过下标访问
dict1 = {'name': 'Tom', 'age': 18, 'love': 'python'}  # 可变，无序：但可以通过键访问

set2 = {'name', 19, 'python'}
print(set2, type(set2))

str1 = 'pythonpython'
list1 = [1, 2, 3, 2]
tup1 = (1, 2, 3, 2)
dict1 = {'name': 'Tom', 'age': 18, 'love': 'python'}
set3 = set(str1)
print(set3, type(set3))
set4 = set(list1)
print(set4, type(set4))
set5 = set(tup1)
print(set5, type(set5))
set6 = set(dict1)
print(set6, type(set6))

set7 = set(i for i in range(1, 5))
print(set7, type(set7))

set8 = {i for i in list1}
print(set8, type(set8))

set8 = {i for i in tup1}
print(set8, type(set8))

set3 = frozenset(str1)
print(set3, type(set3))
set4 = frozenset(list1)
print(set4, type(set4))
set5 = frozenset(tup1)
print(set5, type(set5))
set6 = frozenset(dict1)
print(set6, type(set6))
frozenset({'p', 'n', 't', 'h', 'y', 'o'}) <class 'frozenset'>
frozenset({1, 2, 3}) <class 'frozenset'>
frozenset({1, 2, 3}) <class 'frozenset'>
frozenset({'name', 'age', 'love'}) <class 'frozenset'>

set7 = frozenset(i for i in range(1, 5))
print(set7, type(set7))

set9 = {}
print(type(set9))  # 默认为字典：<class 'dict'>

set9 = set()
set99 = frozenset()

set10 = {'name', 19, [1, 2, 3, 2]}