kopia lustrzana https://github.com/micropython/micropython
63 wiersze
1.4 KiB
Python
63 wiersze
1.4 KiB
Python
import sys
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print((2**64).to_bytes(9, "little"))
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print((2**64).to_bytes(9, "big"))
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b = bytes(range(20))
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il = int.from_bytes(b, "little")
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ib = int.from_bytes(b, "big")
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print(il)
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print(ib)
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print(il.to_bytes(20, "little"))
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print(ib.to_bytes(20, "big"))
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# check padding comes out correctly
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print(il.to_bytes(40, "little"))
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print(ib.to_bytes(40, "big"))
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# check that extra zero bytes don't change the internal int value
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print(int.from_bytes(b + bytes(10), "little") == int.from_bytes(b, "little"))
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# can't write to a zero-length bytes object
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try:
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ib.to_bytes(0, "little")
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except OverflowError:
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print("OverflowError")
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# or one that it too short
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try:
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ib.to_bytes(18, "big")
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except OverflowError:
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print("OverflowError")
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# negative representations
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# MicroPython int.to_bytes() behaves as if signed=True for negative numbers
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if "micropython" in repr(sys.implementation):
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def to_bytes_compat(i, l, e):
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return i.to_bytes(l, e)
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else:
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# Implement MicroPython compatible behaviour for CPython
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def to_bytes_compat(i, l, e):
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return i.to_bytes(l, e, signed=i < 0)
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print(to_bytes_compat(-ib, 20, "big"))
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print(to_bytes_compat(ib * -ib, 40, "big"))
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# case where an additional byte is needed for sign bit
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ib = (2**64) - 1
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print(ib.to_bytes(8, "little"))
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ib *= -1
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try:
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print(to_bytes_compat(ib, 8, "little"))
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except OverflowError:
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print("OverflowError")
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print(to_bytes_compat(ib, 9, "little"))
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print(to_bytes_compat(ib, 9, "big"))
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