circuitpython/tests/basics/memoryview_slice_size.py

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# test memoryview slicing beyond the limit of what memoryview can internally index
try:
from sys import maxsize
from uctypes import bytearray_at
memoryview
except:
print("SKIP")
raise SystemExit
if maxsize <= 0xFFFF_FFFF:
slice_max = 0xFF_FFFF
else:
slice_max = 0xFF_FFFF_FFFF_FFFF
buf = bytearray_at(0, slice_max + 2)
mv = memoryview(buf)
# this should work
print(mv[slice_max : slice_max + 1])
# this should overflow the internal index for memoryview slicing
try:
print(mv[slice_max + 1 : slice_max + 2])
except OverflowError:
print("OverflowError")