Re: What F strings should have been

[Ian Kelly]

On Wed, Feb 14, 2018 at 2:24 PM, D'Arcy Cain  wrote:
> A recent post by Terry Jan Reedy got me thinking about formatting.  I
> like the new(ish) format method for strings and I see some value in F
> strings but it only works well with locals.  Anything more starts
> getting messier than format() and it is supposed to be cleaner.  Also, I
> find that I tend to re-use format strings and wish there was a
> formatting string option.  Here is what I came up with.
>
> class FSTR(str):
>   def __call__(self, *args):
> return self.format(*args)
>
> And here is how it could be used.
>
> s = FSTR("ABC {1} {0} {2[x]}")
> ...
> print(s(1, 2, dict(x=3)))
>
> Too bad that it is too late to assign f'' to that function.

Someday far in the future Python will be remembered as a language that
people in the before-time used to format strings.
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Re: What F strings should have been

[D'Arcy Cain]

On 02/15/18 02:56, Peter Otten wrote:
>> class FSTR(str):
>>   def __call__(self, *args):
>> return self.format(*args)
>>
>> And here is how it could be used.
>>
>> s = FSTR("ABC {1} {0} {2[x]}")
> 
> This can be simplified to
> 
> s = "ABC {1} {0} {2[x]}".format

Hmm.  Hadn't thought of that.

>> print(s(1, 2, dict(x=3)))
>>
>> Too bad that it is too late to assign f'' to that function.
> 
> I must be missing something. How would you simplify or improve the 
> readability of the above with your version of f"..."? 

s = f"ABC {1} {0} {2[x]}"

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D'Arcy J.M. Cain
Vybe Networks Inc.
http://www.VybeNetworks.com/
IM:da...@vex.net VoIP: sip:da...@vybenetworks.com
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Re: What F strings should have been

[Peter Otten]

D'Arcy Cain wrote:

> A recent post by Terry Jan Reedy got me thinking about formatting.  I
> like the new(ish) format method for strings and I see some value in F
> strings but it only works well with locals.  Anything more starts
> getting messier than format() and it is supposed to be cleaner.  Also, I
> find that I tend to re-use format strings and wish there was a
> formatting string option.  Here is what I came up with.
> 
> class FSTR(str):
>   def __call__(self, *args):
> return self.format(*args)
> 
> And here is how it could be used.
> 
> s = FSTR("ABC {1} {0} {2[x]}")

This can be simplified to

s = "ABC {1} {0} {2[x]}".format

> ...
> print(s(1, 2, dict(x=3)))
> 
> Too bad that it is too late to assign f'' to that function.

I must be missing something. How would you simplify or improve the 
readability of the above with your version of f"..."? 


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What F strings should have been

[D'Arcy Cain]

A recent post by Terry Jan Reedy got me thinking about formatting.  I
like the new(ish) format method for strings and I see some value in F
strings but it only works well with locals.  Anything more starts
getting messier than format() and it is supposed to be cleaner.  Also, I
find that I tend to re-use format strings and wish there was a
formatting string option.  Here is what I came up with.

class FSTR(str):
  def __call__(self, *args):
return self.format(*args)

And here is how it could be used.

s = FSTR("ABC {1} {0} {2[x]}")
...
print(s(1, 2, dict(x=3)))

Too bad that it is too late to assign f'' to that function.

-- 
D'Arcy J.M. Cain
Vybe Networks Inc.
http://www.VybeNetworks.com/
IM:da...@vex.net VoIP: sip:da...@vybenetworks.com
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