SymPy | Python中的 Partition.prev_lex()

Partition.prev_lex() ：prev_lex()是一个 sympy Python库函数，它返回前一个整数分区，按字典顺序排列 n。如果分区为 [1, ..., 1]，则此排序环绕 [n]。

Syntax : sympy.combinatorics.partitions.Partition.prev_lex()
Return : previous integer partition, n in lexicographical order 
 

代码 #1：prev_lex() 示例

蟒蛇3 1=1

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# Python code explaining
# SymPy.prev_lex()

# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.partitions import IntegerPartition

# Using from sympy.combinatorics.partitions.Partition.prev_lex() method 
p = IntegerPartition([312, 121, 14, 5])

print('p : ', p)
print('\nPrevious Integer : ', p.prev_lex())