Python | SymPy 置换. cardinality()方法

原文:https://www . geesforgeks . org/python-sympy-置换-基数-method/

arrangement . cardinality():cardinality()是一个 sympy Python 库函数，返回所有可能的排列个数。

语法:sympy . combinations .排列.置换.基数()

返回:所有可能的排列数

代码#1:基数()示例

# Python code explaining
# SymPy.Permutation.cardinality()

# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation

# Using from sympy.combinatorics.permutations.Permutation.cardinality() method 

# creating Permutation
a = Permutation([[2, 0], [3, 1]])

b = Permutation([1, 3, 5, 4, 2, 0])

print ("Permutation a - cardinality form : ", a.cardinality)
print ("Permutation b - cardinality form : ", b.cardinality)

输出:

排列 a–基数形式:24 排列 b–基数形式:720

代码#2:基数()示例–2D 置换

# Python code explaining
# SymPy.Permutation.cardinality()

# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation

# Using from sympy.combinatorics.permutations.Permutation.cardinality() method 

# creating Permutation
a = Permutation([[2, 4, 0], 
                 [3, 1, 2],
                 [1, 5, 6]])

print ("Permutation a - cardinality form : ", a.cardinality)

输出:

排列 a–基数形式:5040

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