Bug report

Bug description:

import datetime as dt
print(dt.time.fromisoformat("T1250.50"))

Actual result is 12:50:00.500000, but according to ISO 8601 the string represents 12:50:30
(50 and half minutes, format "HHMM.mmm", because "a decimal fraction may be added
to the lowest order time element present")

if partial minutes are not supported by Python as stated in the docs, a ValueError should be raised.

Affected are versions 3.10+.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-115225: Parsing fractions correctly in datetime.time.fromisoformat #115313
• gh-115225: Raise error on unsupported ISO 8601 time strings #119339