Python SymPy Permutation.from_sequence()用法及代码示例

Permutation.from_sequence()：from_sequence()是一个sympy Python库函数，它返回从“ i”的排序元素中获取“ i”所需的排列。如果需要任何自定义字符串，也可以将“键”作为参数传递。

用法：

sympy.combinatorics.permutations.Permutation.from_sequence()

返回：
返回所需的排列
从“ i”的排序元素中获取“ i”

代码1：from_sequence()示例

# Python code explaining 
# SymPy.from_sequence() 
  
# importing SymPy libraries 
from sympy.combinatorics.partitions import Partition 
from sympy.combinatorics.permutations import Permutation 
  
# Using from  
# sympy.combinatorics.permutations.Permutation.from_sequence() method  
  
# creating vectors 
a = [1, 0, 0, 0] 
  
b = [6, 5, 4, 3, 0, 0 ] 
  
# inversion forms 
print ("vector a - from_sequence form : \n", Permutation.from_sequence(a)) 
print ("vector b - from_sequence form : \n", Permutation.from_sequence(b))

输出：

vector a – from_sequence form :
Permutation([3, 0, 1, 2])

vector b – from_sequence form :
Permutation([5, 4, 3, 2, 0, 1])

代码2：from_sequence()示例–使用字符串和键

# Python code explaining 
# SymPy.from_sequence() 
  
# importing SymPy libraries 
from sympy.combinatorics.partitions import Partition 
from sympy.combinatorics.permutations import Permutation 
  
# Using from sympy.combinatorics.permutations.Permutation.from_sequence() method  
  
# creating vector 
a = [2, 3, 1, 0] 
  
# inverted vector of a 
print ("vector a - from_sequence form : ",  
       Permutation.from_sequence(a)) 
  
# length = 5, so permutation as per that. 
print ("\nstring - from_sequence form : ",  
       Permutation.from_sequence('GEEKS')) 
  
  
# length = 5, so permutation as per that. 
# defining a key 
print ("\nstring - from_sequence form : ",  
       Permutation.from_sequence('GEEKS', key = lambda x: x.lower()))

输出：

vector a – from_sequence form : Permutation([2, 3, 1, 0])

string – from_sequence form : Permutation([2, 0, 1, 3, 4])

string – from_sequence form : Permutation([2, 0, 1, 3, 4])

相关用法

注：本文由纯净天空筛选整理自noobestars101大神的英文原创作品 Python | SymPy Permutation.from_sequence() method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。