我有一个长长的列表,想将其转换为嵌套列表和字典。
L= ["a","abc","de","efg","", "b","ijk","lm","op","qr","", "c","123","45","6789"]
输出:
nested list:
[["a","abc","de","efg"], ["b","ijk","lm","op","qr"], ["c","123","45","6789"]]
dictionary:
{"a":["abc","de","efg"],
"b":["ijk","lm","op","qr"], "c":["123","45","6789] }
有人可以告诉我如何在 python 中做到这一点吗? 而且我什么也不能导入
答案 0 :(得分:3)
我假设这些组由空字符串分隔。为此,您可以使用itertools.groupby
:
from itertools import groupby
data = ["a","abc","de","efg","", "b","ijk","lm","op","qr","", "c","123","45","6789"]
nl = [list(g) for k, g in groupby(data, ''.__ne__) if k]
d = {next(g): list(g) for k, g in groupby(data, ''.__ne__) if k}
print(nl)
print(d)
结果:
[['a', 'abc', 'de', 'efg'], ['b', 'ijk', 'lm', 'op', 'qr'], ['c', '123', '45', '6789']]
{'a': ['abc', 'de', 'efg'], 'b': ['ijk', 'lm', 'op', 'qr'], 'c': ['123', '45', '6789']}
在分组方式中,我使用的是''.__ne__
,该功能用于“不等于”一个空字符串。这样,它仅捕获非空字符串组。
编辑
我刚刚读到您无法导入。这是一个使用循环的解决方案:
nl = [[]]
for s in data:
if s:
nl[-1].append(s)
else:
nl.append([])
对于字典:
itr = iter(data)
key = next(itr)
d = {key: []}
while True:
try: val = next(itr)
except StopIteration: break
if val:
d[key].append(val)
else:
key = next(itr)
d[key] = []
答案 1 :(得分:0)
以下是将L转换为嵌套列表的方法:
L= ["a","abc","de","efg","","b","ijk","lm","op","qr","","c","123","45","6789"]
nested_list_L = []
temp = []
for item in L:
if item != "":
temp.append(item)
else:
nested_list_L.append(temp)
temp = []
nested_list_L.append(temp)
以下是将L转换为字典的方法:
L= ["a","abc","de","efg","","b","ijk","lm","op","qr","","c","123","45","6789"]
dict_L = {}
temp = []
key = ""
for item in L:
if len(item) == 1:
key = item
elif len(item) > 1:
temp.append(item)
else:
dict_L[key] = temp
temp = []
key = ""
dict_L[key] = temp
答案 2 :(得分:0)
据我了解,您正在尝试:
您当然可以完成任务,而无需任何导入。要拆分列表,只需对其进行迭代并按照以下方式构建嵌套列表:
def split(data, on):
nested = []
curr = []
for x in data:
if x == on:
nested.append(curr)
curr = []
else:
curr.append(x)
if curr != [] or data[-1:] == [on]:
nested.append(curr)
return nested
然后再次遍历此嵌套列表以构建所需的字典:
def build_dict(key_valss):
d = {}
for key_vals in key_valss:
if key_vals != []:
key = key_vals[0]
vals = key_vals[1:]
d[key] = vals
return d
组合两个函数以获取所需的内容:
>>> build_dict( split(data = ["a","abc","de","efg","", "b","ijk","lm","op","qr","", "c","123","45","6789"] , on = '') )
{'a': ['abc', 'de', 'efg'], 'b': ['ijk', 'lm', 'op', 'qr'], 'c': ['123', '45', '6789']}