Re: How to remove "" from starting of a string if provided by the user

2020-08-12 Thread MRAB 

On 2020-08-11 20:43, Dennis Lee Bieber wrote:

On Tue, 11 Aug 2020 14:17:39 -0400, Joel Goldstick
 declaimed the following:


[snip]


Warning -- it will fail if the input is just a pair of quotes or pair of
apostrophes -- improvement is


while s and s[0] in ['"', "'"]:

... if s[0] == s[-1]:
... s = s[1:-1]

If the 'if' condition is False, then 's' will remain unchanged, and it 
will loop forever.


I would suggest:

>>> while s[ : 1] in {'"', "'"} and s[ : 1] == s[-1 : ]:
... s = s[1 : -1]
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Re: How to remove "" from starting of a string if provided by the user

2020-08-12 Thread Matt Wheeler 
On Tue, 11 Aug 2020, 02:20 Ganesh Pal,  wrote:

> The possible value of stat['server2'] can be either (a)
> "'/fileno_100.txt'" or (b) '/fileno_100.txt' .
>
> How do I check if it the value was  (a) i.e string started and ended
> with a quote , so that I can use ast.literal_eval()
>

BAFP

>
def maybe_unquote(string):
try:
return ast.literal_eval(string)
except ValueError:
return string
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Re: How to remove "" from starting of a string if provided by the user

2020-08-12 Thread Serhiy Storchaka 
12.08.20 18:53, MRAB пише:
> I would suggest:
> 
 while s[ : 1] in {'"', "'"} and s[ : 1] == s[-1 : ]:
> ... s = s[1 : -1]

And the condition can be written as

s[ : 1] == s[-1 : ] in {'"', "'"}

or more efficiently as

s and s[0] == s[-1] in '\'"'

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