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Python | SymPy placement.from_sequence()方法

原文:https://www.geesforgeks.org/python-sympy-置换-from_sequence-method/

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

语法: sympy.combinations .排列.置换. from_sequence()

返回: 返回从“I”的排序元素中获得“I”所需的排列

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:

向量 a–from_sequence 形式: 置换([3,0,1,2])

向量 b–from_sequence 形式: 置换([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:

向量 a–from_序列形式:置换([2,3,1,0])

字符串–from_sequence 形式:置换([2,0,1,3,4])

字符串–from_sequence 形式:置换([2,0,1,3,4])



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