def generate_plist(function, start=0):
"""
Generates a parallel list of random size between 1 and 111, or an empty list,
using ``function`` to initialize the elements of the list. If ``start`` is 1,
a non-empty parallel list is generated.
:param function: callable
:param start: int (0 or 1)
:return: PList
"""
choice = randint(start, 2)
size = randint(1, 111)
if choice == 0:
return PList()
if choice == 1:
return PList.init(function, size)
return PList.from_seq([function(i) for i in range(0, size)])
def test_zip_empty():
# pylint: disable=missing-docstring
data = PList()
res = data.zip(data).to_seq()
exp = []
assert res == exp
def test_mapi_empty():
# pylint: disable=missing-docstring
data = PList()
res = data.mapi(pos_upper).to_seq()
exp = []
assert res == exp
def test_map2_empty():
# pylint: disable=missing-docstring
data = PList()
res = data.map2(operator.add, data).to_seq()
exp = []
assert res == exp
def test_init_to_seq_empty():
# pylint: disable=missing-docstring
plst = PList()
res = plst.to_seq()
exp = []
assert res == exp