SymPy | Python中的 Permutation.signature()

Permutation.signature() ：signature()是一个 sympy Python库函数，它返回以规范顺序放置排列元素所需的排列签名。
签名 = (-1)^<反转次数>

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

Return : signature of the permutation.

代码 #1：签名（）示例

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

输出 ：

Permutation a – signature form : 1
Permutation b – signature form : -1

代码 #2：签名（）示例

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

输出 ：

Permutation a – signature form : 1