How do i split a list and and turn it into two dimensional list?-CodePudding

I have a list: lst = [1,2,3,4,'-',5,6,7,'-',8,9,10]
that needs to be split when the '-' character is encountered. and turned into a two dimensional list like so:
[[1,2,3,4],[5,6,7],[8,9,10]]
I have this so far and all it does is take the '-' character out:

l=[]
for item in lst:
   if item != '-':
      l.append(item)

return l

I'm learning how to code so I would appreciate the help

CodePudding user response：

new_list = [] #final result
l=[] #current nested list to add
for item in lst:
    if item != '-':
        l.append(item) # not a '-', so add to current nested list
    else: #if item is not not '-', then must be '-'
        new_list.append(l) # nested list is complete, add to new_list
        l = [] # reset nested list
print(new_list)

CodePudding user response：

its my way.

lst = [1,2,3,4,'-',5,6,7,'-',8,9,10,'-',8,9,10,'-',8,9,10]

l=[]
count = 0
start_point = 0
for item in lst:
    if item == '-':
        l.append(lst[start_point:count])
        start_point = count 1
    count  = 1
    if count == len(lst):
        l.append(lst[start_point:count])
print(l)

CodePudding user response：

One option could be working with strings:

lst = [1,2,3,4,'-',5,6,7,'-',8,9,10]

[list(map(int, el.split())) for el in ' '.join(map(str,lst)).split(' - ')]

Steps:

map every element to string: map(str,lst)
join every element with spaces: ' '.join(map(...))
split on _-_: ' '.join(...).split(' - ')
for every extracted string: for el in ...
split on space: el.split()
remap elements to int: map(int, el.split())
cast to list: list(...)