Converting decimal to byte (little endian): what's wrong with 205?

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21

I’ll settle this :wink:. round() was the obvious way to do this, and anything else is gratuitous complication. It would be more useful to point out that converting to a little-endian byte string “by hand” is much easier done like so - which also has the benefit that it will raise an exception (unlike the original code) if the input is “too big” to represent in 4 bytes:

>>> def pennies(x):
...     return round(x * 100).to_bytes(4, "little")
>>> pennies(4.05).hex()
'95010000'
>>> pennies(3.05).hex()
'31010000'
>>> pennies(2.05).hex()
'cd000000'
>>> pennies((2**32 - 1) / 100).hex()
'ffffffff'
>>> pennies(2**32 / 100).hex()
Traceback (most recent call last):
  File "<pyshell#64>", line 1, in <module>
    pennies(2**32 / 100).hex()
  File "<pyshell#60>", line 2, in pennies
    return round(x * 100).to_bytes(4, "little")
OverflowError: int too big to convert