On 1/21/2020 2:02 PM, Serhiy Storchaka wrote:
21.01.20 12:37, Eric V. Smith пише:
Yes (I wrote a lot of that), but '.17g' doesn't mean to always show
17 digits. See
https://github.com/python/cpython/blob/master/Python/pystrtod.c#L825
where the repr (which is format_code =='r') is translated to
format_code = 'g' and precision = 17.
But I was wrong about them being equivalent: 'g' will drop the
trailing '.0' if it exists, and repr() will not (via flags =
Py_DTSF_ADD_DOT_0).
This is not the only difference between '.17g' and repr().
>>> '%.17g' % 1.23456789
'1.2345678899999999'
>>> format(1.23456789, '.17g')
'1.2345678899999999'
>>> repr(1.23456789)
'1.23456789'
Huh. That's interesting. Thanks!
Eric
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