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Path: ...!news.mixmin.net!news.swapon.de!fu-berlin.de!uni-berlin.de!not-for-mail From: <avi.e.gross@gmail.com> Newsgroups: comp.lang.python Subject: RE: A technique from a chatbot Date: Wed, 3 Apr 2024 01:27:00 -0400 Lines: 153 Message-ID: <mailman.59.1712122026.3468.python-list@python.org> References: <chatbot-20240402181409@ram.dialup.fu-berlin.de> <fvstdk-607.ln1@lazy.lzy> <7d38d9e2-78fb-43af-971f-e0d4afb8b039@tompassin.net> <01d501da8587$8dd66c50$a98344f0$@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Trace: news.uni-berlin.de i1PY9bv7wx94MInLyKlEMwj0EqsdEoVmuhwjzoadnDWA== Cancel-Lock: sha1:thtUwIQdqdNAHMswor+6/+nqCwI= sha256:cIKUwWlZEVDDTGh0eA8/fTSPouc+Akzi1HiMuOECRNs= Return-Path: <avi.e.gross@gmail.com> X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org Authentication-Results: mail.python.org; dkim=pass reason="2048-bit key; unprotected key" header.d=gmail.com header.i=@gmail.com header.b=EKY0Vm5k; 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Tue, 02 Apr 2024 22:27:03 -0700 (PDT) In-Reply-To: <7d38d9e2-78fb-43af-971f-e0d4afb8b039@tompassin.net> X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQG2as0aVd2VIulEmuXRHp684y8JCQJBvrQcAfnDloGxfFEv4A== Content-Language: en-us X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: General discussion list for the Python programming language <python-list.python.org> List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe> List-Archive: <https://mail.python.org/pipermail/python-list/> List-Post: <mailto:python-list@python.org> List-Help: <mailto:python-list-request@python.org?subject=help> List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe> X-Mailman-Original-Message-ID: <01d501da8587$8dd66c50$a98344f0$@gmail.com> X-Mailman-Original-References: <chatbot-20240402181409@ram.dialup.fu-berlin.de> <fvstdk-607.ln1@lazy.lzy> <7d38d9e2-78fb-43af-971f-e0d4afb8b039@tompassin.net> Bytes: 12060 I am a tad confused by a suggestion that any kind of GOTO variant is = bad. The suggestion runs counter to the reality that underneath it all, = compiled programs are chock full of GOTO variants even for simple things = like IF-ELSE. Consider the code here: >> def first_word_beginning_with_e( list_ ): >> for word in list_: >> if word[ 0 ]=3D=3D 'e': return word >> something_to_be_done_at_the_end_of_this_function() If instead the function initialized a variable to nothing useful and in = the loop if it found a word beginning with e and it still contained = nothing useful, copied it into the variable and then allowed the code to = complete the loop and finally returned the variable, that would simply = be a much less efficient solution to the problem and gain NOTHING. There = are many variants you can come up with and when the conditions are = complex and many points of immediate return, fine, then it may be = dangerous. But a single return is fine. The function does have a flaw as it is not clear what it should do if = nothing is found. Calling a silly long name does not necessarily return = anything. Others, like Thomas, have shown other variants including some longer and = more complex ways. A fairly simple one-liner version, not necessarily efficient, would be = to just use a list comprehension that makes a new list of just the ones = matching the pattern of starting with an 'e' and then returns the first = entry or None. This shows the code and test it: text =3D ["eastern", "Western", "easter"] NorEaster =3D ["North", "West", "orient"] def first_word_beginning_with_e( list_ ): return(result[0] if (result :=3D [word for word in list_ if = word[0].lower() =3D=3D 'e']) else None) print(first_word_beginning_with_e( text )) print(first_word_beginning_with_e( NorEaster )) Result of running it on a version of python ay least 3.8 so it supports = the walrus operator: eastern None -----Original Message----- From: Python-list = <python-list-bounces+avi.e.gross=3Dgmail.com@python.org> On Behalf Of = Thomas Passin via Python-list Sent: Tuesday, April 2, 2024 3:31 PM To: python-list@python.org Subject: Re: A technique from a chatbot On 4/2/2024 1:47 PM, Piergiorgio Sartor via Python-list wrote: > On 02/04/2024 19.18, Stefan Ram wrote: >> Some people can't believe it when I say that chatbots improve >> my programming productivity. So, here's a technique I learned >> from a chatbot! >> It is a structured "break". "Break" still is a kind of jump, >> you know? >> So, what's a function to return the first word beginning with >> an "e" in a given list, like for example >> [ 'delta', 'epsilon', 'zeta', 'eta', 'theta' ] >> >> ? Well it's >> def first_word_beginning_with_e( list_ ): >> for word in list_: >> if word[ 0 ]=3D=3D 'e': return word >> >> . "return" still can be considered a kind of "goto" statement. >> It can lead to errors: >> >> def first_word_beginning_with_e( list_ ): >> for word in list_: >> if word[ 0 ]=3D=3D 'e': return word ========== REMAINDER OF ARTICLE TRUNCATED ==========