Python中的SymPy Permutation.signature()

Permutation.signature() : signature()是一个sympy Python库函数，它返回将包络的元素按正则顺序排列所需的包络的签名。
签名=(-1)^

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

返回： permutation的签名。

代码#1：signature()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：signature()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())