What’s the result of this script?

s = "tracebacks_show_local"
s.strip("tracebacks_")

how_local

?

Alright, I was hoping it will trap someone (myself), the right way to do it with python>=3.9 is using the new built-in method

s.removeprefix

or

s.removesuffix

method. Maybe I should structure the problem like this.

In [10]: "tracebacks_show_local".strip("tracebacks")
Out[10]: '_show_local'

In [11]: "tracebacks_show_local".strip("tracebacks_")
Out: ???

hahaha yeah,

strip

is a trap!!

What’s the clean way to do that then?

keyword = "tracebacks_"
if s.startswith(keyword):
  s = s[len(keyword):]

or

s = s.replace("tracebacks_", "")

?

Yeah, I’ve always done it like in you suggest with your first example. I didn’t even realise

removeprefix

existed until very recently

Oh, interesting, I didn't know of

removeprefix

Answer from ChatGPT (as always)

def strip_prefix_suffix(string, prefix=None, suffix=None):
    """
    Strips the specified prefix and/or suffix from a string.

    Args:
        string (str): The input string.
        prefix (str, optional): The prefix to remove. Defaults to None.
        suffix (str, optional): The suffix to remove. Defaults to None.

    Returns:
        str: The modified string after stripping the prefix and/or suffix.
    """
    if prefix and string.startswith(prefix):
        string = string[len(prefix):]
    if suffix and string.endswith(suffix):
        string = string[: -len(suffix)]
    return string

if s.startswith(keyword):
  s = s[len(keyword):]

this does essentially the same as the C implementation https://github.com/python/cpython/pull/18939/files#diff-6878f29bbfb711dc7cd2a89b2b2941b1f900b6367d30181a2ff45460b591b04cR1202-R1218

s = "tracebacks_show_local"
s.partition("tracebacks_")[2]

Will split on the first 'tracebacks_' it encounters in the string and returns everything to the right of it

I want

s.removeprefix

, but it’s not available Python < 3.9, there are many ways that work but just less readable.

I think it depends what you want to do. If you want an equivalent of

removeprefix

, I definitely prefer @Juan Luis’s answer, since it's explicit around it being the

prefix

(whereas

partition

could grab it from wherever, unless you also want to assert the first partition is empty).

I copy pasted @Nok Lam Chan answer 😄 https://kedro-org.slack.com/archives/C03QF15L1K9/p1684848764909259?thread_ts=1684848114.048909&amp;cid=C03QF15L1K9

All fair points 😁 I ask it in #C03QF15L1K9 for a reason, just curious what’s other thought : D