Python 中的 SymPy | subset . prev _ dictionary graphic()

原文:https://www . geesforgeks . org/sympy-subset-prev _ dictionary graphic-in-python/

subset . prev _ dictionary():prev _ dictionary()是一个 sympy Python 库函数，返回之前的字典序子集。

语法: sympy . combinations . subset . subset . prev _ dictionary graphic()

返回: 之前的格雷码有序子集。

代码# 1:prev _ 词典()示例

# Python code explaining
# SymPy.Subset.prev_lexicographic()

# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset

# Using from 
# sympy.combinatorics.subset.Subsets.prev_lexicographic()

# Creating Subset
a = Subset(['c', 'd'], ['geek', 'for', 'c', 'd'])

# prev_lexicographic value
print ("Subset a prev_lexicographic : ", a.prev_lexicographic().subset)

输出:

子集 a prev _ 词典顺序:['c']

代码# 2:prev _ 词典()示例

# Python code explaining
# SymPy.Subset.prev_lexicographic()

# importing SymPy libraries
from sympy.combinatorics import Permutation, Cycle
from sympy.combinatorics.subsets import Subset

# Using from 
# sympy.combinatorics.subset.Subsets.prev_lexicographic()

# Creating Subset
a = Subset([2, 3, 4], [1, 2, 3, 4, 5])

# prev_lexicographic value
print ("Subset a prev_lexicographic : ", a.prev_lexicographic().subset)

输出:

子集 a prev _ 字典顺序:[2，3]

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