SymPy | Python中的 Permutation.parity()

Permutation.parity() : parity()是一个 sympy Python库函数，它返回排列的奇偶性。它意味着排列中反转次数的奇偶性。

Syntax : sympy.combinatorics.permutations.Permutation.parity()

Return : next permutation in lexicographical parity

代码 #1：parity() 示例

# Python code explaining
# SymPy.Permutation.parity()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from sympy.combinatorics.permutations.Permutation.parity() method 
  
# creating Permutation
a = Permutation([[2, 0], [3, 1]])
  
b = Permutation([1, 3, 5, 4, 2, 0])
  
  
print ("Permutation a - parity form : ", a.parity())
print ("Permutation b - parity form : ", b.parity())

输出 ：

Permutation a – parity form : 0
Permutation b – parity form : 1

代码 #2：parity() 示例– 2D 排列

# Python code explaining
# SymPy.Permutation.parity()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from sympy.combinatorics.permutations.Permutation.parity() method 
  
# creating Permutation
a = Permutation([[2, 4, 0], 
                 [3, 1, 2],
                 [1, 5, 6]])
  
  
print ("Permutation a - parity form : ", a.parity())

输出 ：

Permutation a – parity form : 0