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import sys
print((10).to_bytes(1, "little"))
print((111111).to_bytes(4, "little"))
print((100).to_bytes(10, "little"))
print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
print(int.from_bytes(b"\x01\0\0\0\0\0\0\0", "little"))
print(int.from_bytes(b"\x00\x01\0\0\0\0\0\0", "little"))
# check that extra zero bytes don't change the internal int value
print(int.from_bytes(bytes(20), "little") == 0)
print(int.from_bytes(b"\x01" + bytes(20), "little") == 1)
# big-endian conversion
print((10).to_bytes(1, "big"))
print((100).to_bytes(10, "big"))
print(int.from_bytes(b"\0\0\0\0\0\0\0\0\0\x01", "big"))
print(int.from_bytes(b"\x01\0", "big"))
# negative number of bytes should raise an error
try:
(1).to_bytes(-1, "little")
except ValueError:
print("ValueError")
# zero byte destination should also raise an error
try:
(1).to_bytes(0, "little")
except OverflowError:
print("OverflowError")
# except for converting 0 to a zero-length byte array
print((0).to_bytes(0, "big"))
# byte length can fit the integer directly
print((0xFF).to_bytes(1, "little"))
print((0xFF).to_bytes(1, "big"))
print((0xEFF).to_bytes(2, "little"))
print((0xEFF).to_bytes(2, "big"))
print((0xCDEFF).to_bytes(3, "little"))
print((0xCDEFF).to_bytes(3, "big"))
# OverFlowError if not big enough
try:
(0x123).to_bytes(1, "big")
except OverflowError:
print("OverflowError")
try:
(0x12345).to_bytes(2, "big")
except OverflowError:
print("OverflowError")
try:
(0x1234567).to_bytes(3, "big")
except OverflowError:
print("OverflowError")
# negative representations
# MicroPython int.to_bytes() behaves as if signed=True for negative numbers
if "micropython" in repr(sys.implementation):
def to_bytes_compat(i, l, e):
return i.to_bytes(l, e)
else:
# Implement MicroPython compatible behaviour for CPython
def to_bytes_compat(i, l, e):
return i.to_bytes(l, e, signed=i < 0)
print(to_bytes_compat(-1, 1, "little"))
print(to_bytes_compat(-1, 3, "little"))
print(to_bytes_compat(-1, 1, "big"))
print(to_bytes_compat(-1, 3, "big"))
print(to_bytes_compat(-128, 1, "big"))
print(to_bytes_compat(-32768, 2, "big"))
print(to_bytes_compat(-(1 << 23), 3, "big"))
try:
print(to_bytes_compat(-129, 1, "big"))
except OverflowError:
print("OverflowError")
try:
print(to_bytes_compat(-32769, 2, "big"))
except OverflowError:
print("OverflowError")
try:
print(to_bytes_compat(-(1 << 23) - 1, 2, "big"))
except OverflowError:
print("OverflowError")
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