📅  最后修改于: 2020-07-19 02:46:44             🧑  作者: Mango
如果集合A的所有元素都存在于另一个作为参数传递的集合B中,则issubset()方法将返回True;如果不存在所有元素,则返回false。
句法:A.issubset(B)
检查A是否是B的子集。
返回值:
如果A是B的子集,则返回true,否则返回false。
代码1:
# Python program to demonstrate working of
# issubset().
A = {4, 1, 3, 5}
B = {6, 0, 4, 1, 5, 0, 3, 5}
# Returns True
print(A.issubset(B))
# Returns False
# B is not subset of A
print(B.issubset(A))
输出:
True
False
代码2:
# Another Python program to demonstrate working
# of issubset().
A = {1, 2, 3}
B = {1, 2, 3, 4, 5}
C = {1, 2, 4, 5}
# Returns True
print(A.issubset(B))
# Returns False
# B is not subset of A
print(B.issubset(A))
# Returns False
print(A.issubset(C))
# Returns True
print(C.issubset(B))
输出:
True
False
False
True