New submission from Dennis Sweeney <sweeney.dennis...@gmail.com>:
Following discussion here ( https://mail.python.org/archives/list/python-id...@python.org/thread/RJARZSUKCXRJIP42Z2YBBAEN5XA7KEC3/ ), there is a proposal to add new methods str.cutprefix and str.cutsuffix to alleviate the common misuse of str.lstrip and str.rstrip. I think sticking with the most basic possible behavior def cutprefix(self: str, prefix: str) -> str: if self.startswith(prefix): return self[len(prefix):] # return a copy to work for bytearrays return self[:] def cutsuffix(self: str, suffix: str) -> str: if self.startswith(suffix): # handles the "[:-0]" issue return self[:len(self)-len(suffix)] return self[:] would be best (refusing to guess in the face of ambiguous multiple arguments). Someone can do, e.g. >>> 'foo.tar.gz'.cutsuffix('.gz').cutsuffix('.tar') 'foo' to cut off multiple suffixes. More complicated behavior for multiple arguments could be added later, but it would be easy to make a mistake in prematurely generalizing right now. In bikeshedding method names, I think that avoiding the word "strip" would be nice so users can have a consistent feeling that "'strip' means character sets; 'cut' means substrings". ---------- components: Interpreter Core messages: 363958 nosy: Dennis Sweeney priority: normal severity: normal status: open title: Add str methods to remove prefixes or suffixes type: enhancement versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39939> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
