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# test memoryview retains pointer to original object/buffer
try:
memoryview
except:
print("SKIP")
raise SystemExit
b = bytearray(10)
m = memoryview(b)[1:]
for i in range(len(m)):
m[i] = i
# reclaim b, but hopefully not the buffer
b = None
import gc
gc.collect()
# allocate lots of memory
for i in range(100000):
[42, 42, 42, 42]
# check that the memoryview is still what we want
print(list(m))
# check that creating a memoryview of a memoryview retains the underlying data
m = None
gc.collect() # cleanup from previous test
m = memoryview(memoryview(bytearray(i for i in range(50)))[5:-5])
print(sum(m), list(m[:10]))
gc.collect()
for i in range(10):
list(range(10)) # allocate memory to overwrite any reclaimed heap
print(sum(m), list(m[:10]))
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