Python多层嵌套list的递归处理方法(推荐)
问题：用Python处理一个多层嵌套list
['and', 'B', ['not', 'A'],[1,2,1,[2,1],[1,1,[2,2,1]]], ['not', 'A', 'A'],['or', 'A', 'B' ,'A'] , 'B']
需求1)如何展开成一层?
需求2)如何删除重复的元素? 包括重复的list, 要考虑子list的重复元素删除后造成的子list重复
#!/usr/bin/env python
# -*- coding: utf-8 -*-
def unilist(ll):
"""
功能:用递归方法删除多层列表中重复元素
"""
result = []
for i in ll:
if isinstance(i, list):
if unilist(i) not in result:
result.append(unilist(i))
else:
if i not in result:
result.append(i)
return result
def flatten(ll):
"""
功能:用递归方法展开多层列表,以生成器方式输出
"""
if isinstance(ll, list):
for i in ll:
for element in flatten(i):
yield element
else:
yield ll
testcase= ['and', 'B', ['not', 'A'],[1,2,1,[2,1],[1,1,[2,2,1]]], ['not', 'A', 'A'],['or', 'A', 'B' ,'A'] , 'B']
print unilist(testcase)
print list(flatten(testcase))运行结果
['and', 'B', ['not', 'A'], [1, 2, [2, 1], [1, [2, 1]]], ['or', 'A', 'B']] ['and', 'B', 'not', 'A', 1, 2, 1, 2, 1, 1, 1, 2, 2, 1, 'not', 'A', 'A', 'or', 'A', 'B', 'A', 'B']
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