Question

from __future__ import annotations
import random
from typing import TYPE_CHECKING, List, Any
from course import sort_students
if TYPE_CHECKING:
from survey import Survey
from course import Course, Student

def slice_list(lst: List[Any], n: int) -> List[List[Any]]:
"""
Return a list containing slices of <lst> in order. Each slice is a
list of size <n> containing the next <n> elements in <lst>.

The last slice may contain fewer than <n> elements in order to make sure
that the returned list contains all elements in <lst>.

=== Precondition ===
n <= len(lst)

>>> slice_list([3, 4, 6, 2, 3], 2) == [[3, 4], [6, 2], [3]]
True
>>> slice_list(['a', 1, 6.0, False], 3) == [['a', 1, 6.0], [False]]
True
"""
ret = []
tmp = []
for i in range(len(lst)):
if i % n == 0 and i != 0:
tmp.append(lst[i])
if len(tmp) != 0:
ret.append(tmp)
tmp = []
return ret

def windows(lst: List[Any], n: int) -> List[List[Any]]:
"""
Return a list containing windows of <lst> in order. Each window is a list
of size <n> containing the elements with index i through index i+<n> in the
original list where i is the index of window in the returned list.

=== Precondition ===
n <= len(lst)

>>> windows([3, 4, 6, 2, 3], 2) == [[3, 4], [4, 6], [6, 2], [2, 3]]
True
>>> windows(['a', 1, 6.0, False], 3) == [['a', 1, 6.0], [1, 6.0, False]]
True
"""
ret = []
tmp = []
for i in range(n):
tmp.append(lst[i])
ret.append(tmp)
for i in range(len(lst)-n):
tmp = tmp[1:]
tmp.append(lst[i+n])
ret.append(tmp)
return ret

I don't think the codes of these two methods are correct? Can you help me check these two methods and tell me the correct codes using python3.8? thankyou.

Answer 1

# The below two codes are working, I have tested them in google colab

def slice_list(lst,n):

  ret=[]

  tmp=[]

  for i in range(len(lst)):

    if i%n == 0 and i!=0:

      #change here

      ret.append(tmp)

      tmp=[]

      #upto here

    tmp.append(lst[i])

  if len(tmp)!=0:

    ret.append(tmp)

  return ret

def windows(lst,n):

  ret=[]

  tmp=[]

  for i in range(n):

    tmp.append(lst[i])

  ret.append(tmp)

  for i in range(len(lst)-n):

    tmp = tmp[1:]

    tmp.append(lst[i+n])

    ret.append(tmp)

  return ret

# Please upvote, if you got the answer :)