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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