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From: Lawrence =?iso-8859-13?q?D=FFOliveiro?= <ldo@nz.invalid>
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Subject: Re: In precision typing we trust
Date: Sat, 30 Aug 2025 22:34:55 -0000 (UTC)
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On Sat, 30 Aug 2025 08:49:22 -0000 (UTC), Kevin Chadwick wrote:

>> Ada may be helpful with keeping complex things manageable. But Python
>> helps keep simple things simple, in a way that Ada cannot.
>
> I don't know if there is *ANY* truth to that as I do not use Python
> but your example seems to suggest Python has complicated gotchas
> where Ada is simple. The code you linked didn't seem anywhere near
> as readable as Ada either.

You mean the BitVector example? That was a dump from a Jupyter
notebook, in “asciidoc” format, with various indicators as to what was
input source and what was program output. Here’s what the code looks
like without that:

    # constructor: v = BitVector(«width»[, «init»])
    # «init» defaults to all zeroes if omitted
    v1 = BitVector(3, 2)
    v2 = BitVector(5)
    v1, v2, int(v1), int(v2)

    # access can be single bits, or use standard Python slice notation
    v1[0:2], v1[2], v1[1:3], v2[2:5]

    v1[1:3] = [False, True]
    v2[:] = 13

    v1, v2, int(v1), int(v2)

    # “+” does concatenation of BitVectors; note little-endian ordering.
    v1 + v2, int(v1 + v2)

    # shifts produce results with same number of bits
    v2, v2 >> 3, v2 << 3, v2[:3] << 3, (v2 + BitVector(3)) << 3

    v1[1:3]

    Following all raise errors

    v2[:1] = v1

    v1[:] = 8

    v2[0] = 2

    v1[:] = v2[:]

I’ll leave you to go back and reread the other posting, to see how the
output relates to that ...