Such as that:
def starting_when(element):
...
a_list[starting_when:]
Is equivalent to:
from itertools import dropwhile
def starting_when(element):
...
list(dropwhile(lambda x: not starting_when(x), a_list))
And
def ending_when(element:
...
a_list[:ending_when]
To:
from itertools import dropwhile
def ending_when(element:
...
list(itertools.takwhile(lambda x: not condition(x), a_list))
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