kopia lustrzana https://github.com/micropython/micropython
85 wiersze
2.2 KiB
Python
85 wiersze
2.2 KiB
Python
import sys
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print((10).to_bytes(1, "little"))
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print((111111).to_bytes(4, "little"))
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print((100).to_bytes(10, "little"))
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print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
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print(int.from_bytes(b"\x01\0\0\0\0\0\0\0", "little"))
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print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
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# check that extra zero bytes don't change the internal int value
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print(int.from_bytes(bytes(20), "little") == 0)
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print(int.from_bytes(b"\x01" + bytes(20), "little") == 1)
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# big-endian conversion
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print((10).to_bytes(1, "big"))
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print((100).to_bytes(10, "big"))
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print(int.from_bytes(b"\0\0\0\0\0\0\0\0\0\x01", "big"))
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print(int.from_bytes(b"\x01\0", "big"))
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# negative number of bytes should raise an error
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try:
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(1).to_bytes(-1, "little")
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except ValueError:
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print("ValueError")
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# zero byte destination should also raise an error
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try:
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(1).to_bytes(0, "little")
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except OverflowError:
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print("OverflowError")
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# except for converting 0 to a zero-length byte array
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print((0).to_bytes(0, "big"))
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# byte length can fit the integer directly
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print((0xFF).to_bytes(1, "little"))
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print((0xFF).to_bytes(1, "big"))
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print((0xEFF).to_bytes(2, "little"))
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print((0xEFF).to_bytes(2, "big"))
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print((0xCDEFF).to_bytes(3, "little"))
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print((0xCDEFF).to_bytes(3, "big"))
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# OverFlowError if not big enough
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try:
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(0x123).to_bytes(1, "big")
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except OverflowError:
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print("OverflowError")
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try:
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(0x12345).to_bytes(2, "big")
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except OverflowError:
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print("OverflowError")
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try:
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(0x1234567).to_bytes(3, "big")
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except OverflowError:
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print("OverflowError")
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# negative representations
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print((-1).to_bytes(1, "little", signed=True))
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print((-1).to_bytes(3, "little", signed=True))
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print((-1).to_bytes(1, "big", signed=True))
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print((-1).to_bytes(3, "big", signed=True))
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print((-128).to_bytes(1, "big", signed=True))
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print((-32768).to_bytes(2, "big", signed=True))
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print((-(1 << 23)).to_bytes(3, "big", signed=True))
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try:
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print((-129).to_bytes(1, "big", signed=True))
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except OverflowError:
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print("OverflowError")
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try:
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print((-32769).to_bytes(2, "big", signed=True))
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except OverflowError:
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print("OverflowError")
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try:
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print(((-1 << 23) - 1).to_bytes(2, "big", signed=True))
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except OverflowError:
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print("OverflowError")
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