Python 中的 SymPy | Subset.prev_gray()
原文:https://www . geesforgeks . org/sympy-subset-prev _ gray-in-python/
subset . prev _ gray():prev _ Gray()是一个 sympy Python 库函数，返回之前的 Gray 码有序子集。
语法: sympy . combinations . subset . subset . prev _ gray()
返回: 之前的格雷码有序子集。
代码#1 : prev_gray()示例
# Python code explaining
# SymPy.Subset.prev_gray()
# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset
# Using from
# sympy.combinatorics.subset.Subsets.prev_gray()
# Creating Subset
a = Subset(['c', 'd'], ['geek', 'for', 'c', 'd'])
# prev_gray value
print ("Subset a prev_gray : ", a.prev_gray().subset)
输出:
子集 a prev_gray : ['d']
代码#2 : prev_gray()示例
# Python code explaining
# SymPy.Subset.prev_gray()
# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset
# Using from
# sympy.combinatorics.subset.Subsets.prev_gray()
# Creating Subset
a = Subset([2, 3, 4], [1, 2, 3, 4, 5])
# prev_gray value
print ("Subset a prev_gray : ", a.prev_gray().subset)
输出:
子集 a prev_gray : [2，3，4，5]
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