I wonder if applying regular expressions would sufficiently address
your use case.
On Mon, 2022-03-28 at 14:13 +0200, StrikerOmega wrote:
> Hello everyone,
>
> When I am coding in Python I often encounter situations where I have
> a string like this one.
>
> sample="""
> fruit:apple
> tree:[Apple tree]
> quantity:{5}
> quantity:{3}
> """
>
> And I want to grab some kind of value from it.
>
> So let me introduce you to the grab function. This is the definition:
>
> def grab(start, end, list_out=False):
>
> Now, if you want to get the fruit from the sample string you can just
> "grab" it as follows:
>
> sample.grab(start="fruit:", end="\n")
> >> 'apple'
>
> You can also "grab" values enclosed in brackets or in any kind of
> character and It works as you would expect.
>
> sample.grab(start="tree:[", end="]")
> >> 'Apple tree'
>
> The optional argument "list_out" makes the function return a list of
> values, for cases where there are several of them to grab.
>
> sample.grab(start="quantity:{", end="}", list_out=True)
> >> [5, 3]
>
> The "grab" function will return only the first occurrence if
> "list_out" is omitted or passed as False.
>
> sample.grab(start="quantity:{", end="}")
> >> 5
>
> sample.grab(start="quantity:{", end="}", list_out=False)
> >> 5
>
> As you can see, it is incredibly useful for extracting substrings
> from a larger and more complex string and can change the way we parse
> strings for the better.
>
> For example, it could simplify the way we parse the fields of HTTP
> headers. It also has many applications for the parsing of
> configuration files and the construction of strings for SQL queries
> and bash commands among others.
>
> I have implemented this function locally to use it for my personal
> projects and It has proven to be really useful in practice, so I hope
> you find it useful as well and consider adding it as a class method
> for strings in Python.
>
> Julio Cabria
> Engineering student
> Autonomous University of Madrid
> _______________________________________________
> Python-ideas mailing list -- python-ideas@python.org
> To unsubscribe send an email to python-ideas-le...@python.org
> https://mail.python.org/mailman3/lists/python-ideas.python.org/
> Message archived at
> https://mail.python.org/archives/list/python-ideas@python.org/message/NV7G6W4RHTMMVIUDHQAATSVYFRIV6G7Z/
> Code of Conduct: http://python.org/psf/codeofconduct/
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-le...@python.org
https://mail.python.org/mailman3/lists/python-ideas.python.org/
Message archived at
https://mail.python.org/archives/list/python-ideas@python.org/message/WXHJEJBB5BGI7HJJ63NPZDAV7QX6XF4G/
Code of Conduct: http://python.org/psf/codeofconduct/
