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String slices

On 10/08/2019 17:35, Dennis Lee Bieber wrote:
> On Sat, 10 Aug 2019 11:45:43 +0200, "Peter J. Holzer"<hjp-python at>
> declaimed the following:
>> There are of course many variants to all three methods.
> 	And then one can get downright nasty...
>>>> X = 3.14
>>>> Y = 2.78
>>>> Z = 6.226E23
>>>> print("".join(["Plane rotation %s: %s\n" % (nm, vl)
> ... 	for (nm, vl) in [("X", X), ("Y", Y), ("Z", Z)]]))
> Plane rotation X: 3.14
> Plane rotation Y: 2.78
> Plane rotation Z: 6.226e+23
> (replace "print" with "outstream.write" for use with the file)
|outstream.write| could be very useful, thank you Peter and Cameron 
(neither being Rhodri James). If I wanted to learn more about formatting 
strings is there a better place to go than:

And Dennis, whatever you did there is very impressive and works 
perfectly but I don?t know enough to be able to use it. Please will you 
say more or direct me to some reference? I couldn?t find ?nasty? in the 
Python docs.