Formatting floating point

[DL Neil]

On 8/10/19 4:04 AM, boffi wrote:
> DL Neil <PythonList at DancesWithMice.info> writes:
> 
>> Agreed: there's ton(ne)s of information 'out there', much of it old,
>> eg Python2, "formatter" (deprecated since v3.4)
> ?
> are you referring to the `string.Formatter`[*] class?
>      $ python
>      Python 3.7.4 (default, Aug 13 2019, 20:35:49)
>      [GCC 7.3.0] :: Anaconda, Inc. on linux
>      Type "help", "copyright", "credits" or "license" for more information.
>      >>> from string import Formatter
> if not, what else?
> g
> [*] https://docs.python.org/2/library/string.html#string.Formatter
>      https://docs.python.org/3.7/library/string.html#string.Formatter


As mentioned, there is a wealth of information, but I must admit it took 
a moment-or-two before I re-located the 'official' reference to f-strings:

2.4.3. Formatted string literals 
https://docs.python.org/3/reference/lexical_analysis.html#f-strings
(and please 'read-around' this section for more valuable data!)

FYI the original PEP is at https://www.python.org/dev/peps/pep-0498/


It is worth reading about string formatters (per (your) ref, above), 
because many elements of the 'Formatting mini-language' are also 
available within f-strings!


As you have probably observed, there are now (v3.6+) several methods 
which can be applied to the formatting of data. Each has its advantages, 
and whilst I have a preference for, and thus recommended, WRITING code 
to use f-strings, it is also (likely to be) important that we READ and 
comprehend the older/alternatives!


NB politesse suggests that I should apologise, but I no-longer wish to 
work with Python2; hence only mentioning Py3 'here'.
-- 
Regards =dn