Given 2 callables checking when a condition arises and returning True:
def starting_when(element):
...
def ending_when(element:
...
Allow:
a_list[starting_when:]
To be equivalent to:
from itertools import dropwhile
list(dropwhile(lambda x: not starting_when(x), a_list))
And:
a_list[:ending_when]
To:
from itertools import takewhile
list(takewhile(lambda x: not ending_when(x), a_list))
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