SymPy | Python中的 Subset.cardinality()

Subset.cardinality() ：cardinality()是一个 sympy Python库函数，它返回所有可能子集的数量。

Syntax :
sympy.combinatorics.subset.Subset.cardinality()

Return :
number of all possible subsets

代码 #1：cardinality() 示例

# Python code explaining
# SymPy.Subset.cardinality()
  
# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset
  
# Using from 
# sympy.combinatorics.subset.Subsets.cardinality()
  
# Creating Subset
a = Subset(['c', 'd'], ['geek', 'for', 'c', 'd'])
  
# cardinality value
print ("Subset a cardinality : ", a.cardinality)

输出 ：

Subset a cardinality : 16

代码 #2：cardinality() 示例

# Python code explaining
# SymPy.Subset.cardinality()
  
# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset
  
# Using from 
# sympy.combinatorics.subset.Subsets.cardinality()
  
# Creating Subset
a = Subset(['c', 'd'], ['23', 'c', 'd'])
  
  
# cardinality value
print ("Subset a cardinality : ", a.cardinality)

输出 ：

Subset a cardinality : 8