If you don't want to use next() you can use unpacking:

>>> a, *_ = filter(lambda e: e == 10, [7,8,9,10,11,12])
>>> a
10
>>> _
[]
>>> a, *_ = filter(lambda e: e == 1000, [7,8,9,10,11,12])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: not enough values to unpack (expected at least 1, got 0)

If you don't want to use next() you can use unpacking:

>>> a, *_ = filter(lambda e: e == 10, [7,8,9,10,11,12])
>>> a
10
>>> _
[]
>>> a, *_ = filter(lambda e: e == 1000, [7,8,9,10,11,12])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: not enough values to unpack (expected at least 1, got 0)

Note that using filter() is equivalent to writing (item for item in iterable if condition) Python Docs.

If you need support for the edge case you can write like this:

>>> a, *_ = [e for e in [7,8,9,10,11,12] if e == 1000] or [None]
>>> a
None
>>> _
[]