SymPy | Permutation.signature() in Python

Last Updated : 27 Aug, 2019

Permutation.signature() : signature() is a sympy Python library function that returns the signature of the permutation needed to place the elements of the permutation in canonical order. Signature = (-1)^<number of inversions>

Syntax : sympy.combinatorics.permutations.Permutation.signature() Return : signature of the permutation.

Code #1 : signature() Example

Python3 1=1

# 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())

Output :

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

Code #2 : signature() Example

Python3 1=1

# 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())

Output :

Permutation a - signature form : 1

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SymPy | Permutation.signature() in Python

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