This is a python code and I want to covert it from for loop into while loop. can anyone help me with that, please

from typing import List

def only_evens(lst: List[List[int]]) -> List[List[int]]:

"""Return a list of the lists in lst that contain only even integers.

>>> only_evens([[1, 2, 4], [4, 0, 6], [22, 4, 3], [2]])

[[4, 0, 6], [2]]

"""

even_lists = []

for sublist in lst:

iseven=True

for element in sublist:

if element%2!=0:

iseven=False

if iseven==True:

even_lists.append(sublist)

return even_lists