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micropython/tests/basics/memoryview2.py

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py/objstr: Binary type of str/bytes for buffer protocol is 'B'. The type is an unsigned 8-bit value, since bytes objects are exactly that. And it's also sensible for unicode strings to return unsigned values when accessed in a byte-wise manner (CPython does not allow this).
2016-05-07 21:18:17 +01:00
# test memoryview accessing maximum values for signed/unsigned elements
from array import array
print(list(memoryview(b'\x7f\x80\x81\xff')))
print(list(memoryview(array('b', [0x7f, -0x80]))))
print(list(memoryview(array('B', [0x7f, 0x80, 0x81, 0xff]))))
print(list(memoryview(array('h', [0x7f00, -0x8000]))))
print(list(memoryview(array('H', [0x7f00, 0x8000, 0x8100, 0xffff]))))
tests: Disable memoryview tests that overflow int conversion. They fail on builds with 32-bit word size.
2016-05-07 22:36:49 +01:00
# these constructors give an internal overflow in uPy
#print(list(memoryview(array('i', [0x7f000000, -0x80000000]))))
#print(list(memoryview(array('I', [0x7f000000, 0x80000000, 0x81000000, 0xffffffff]))))