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From: Petr Messner <petr.messner@gmail.com>
Newsgroups: cz.comp.lang.python
Subject: Re: [python] =?utf-8?q?Spojovani_retezcu=3A_=28bylo=3A_Rekurzivn?= =?utf-8?b?w60gZ2VuZXLDoXRvciB2IFB5dGhvbnUgMz8p?=
Date: Sun, 28 Aug 2016 17:40:25 +0200
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Xref: csiph.com cz.comp.lang.python:3128

D=C3=ADky Honzo za odkaz.=20

Jinak - Python, Ruby, Java, C++, na jazyku nez=C3=A1le=C5=BE=C3=AD... Mus=C3=
=ADm v=C4=9Bd=C4=9Bt, jestli dan=C3=A1 operace manipuluje s n=C4=9Bkter=C3=BD=
m sv=C3=BDm operandem, nebo vytv=C3=A1=C5=99=C3=AD novou hodnotu. A proto=C5=
=BEe jsou stringy v Pythonu immutable, tak jako program=C3=A1tor bych m=C4=9B=
l tu=C5=A1it, =C5=BEe se bude kop=C3=ADrovat. A d=C3=A1t si pozor na p=C5=99=
=C3=ADpady, kdy se bude kop=C3=ADrovat furt dokola.

=C5=BDe to pypy n=C4=9Bjak um=C3=AD optimalizovat je hezk=C3=A9, ale i kdyby=
ch ho pou=C5=BE=C3=ADval, tak fakt nen=C3=AD dobr=C3=A9 spol=C3=A9hat se na t=
o, =C5=BEe mi p=C5=99eklada=C4=8D oprav=C3=AD chybu v samotn=C3=A9m n=C3=A1v=
rhu algoritmu.

Petr Messner

28. 8. 2016 v 17:04, Honza Kr=C3=A1l <honza.kral@gmail.com>:

> 2016-08-28 16:51 GMT+02:00 Jirka Vejrazka <jirka.vejrazka@gmail.com>:
>> Jenom poznamka ne okraj:
>>=20
>> "ned=C4=9Blej skl=C3=A1d=C3=A1n=C3=AD =C5=99et=C4=9Bzc=C5=AF stylem txt +=
=3D part, je to stra=C5=A1n=C4=9B pomal=C3=A9 (O(n^2)
>> m=C3=ADsto O(n)).. Z txt si ud=C4=9Blej list a pou=C5=BE=C3=ADvej append:=
 txt.append(part) a na
>> konci "".join(txt)."
>>=20
>> Tohle platilo nekdy do vydani Pythonu 2.5. V te verzi bylo spojovani rete=
zcu
>> pomoci +=3D vyrazne zrychleno a dnes uz to neni takove vykonove omezeni, j=
ako
>> driv.
>=20
> Pokud je tech textu vice, .join() je stale lepsi, vice detailu:
> https://youtu.be/odjpaKL-Fsg?t=3D20m45s
>=20
>>=20
>> Ale je fakt, ze ''.join pouzivam ze zvyku taky :)
>>=20
>>  Jirka
>>=20
>>> On 28 August 2016 at 13:52, Petr Messner <petr.messner@gmail.com> wrote:=

>>>=20
>>>=20
>>> co takhle tohle?
>>>=20
>>>=20
>>> <verse>a b <mark sID=3D"x"> c d</verse><verse>e f<mark eID=3D"x"> g h</v=
erse>
>>>=20
>>>=20
>>> Oprava:
>>>=20
>>> <verse>a b <mark sID=3D"x"/> c d</verse><verse>e f<mark eID=3D"x"/> g
>>> h</verse>
>>>=20
>>> PM
>>>=20
>>> _______________________________________________
>>> Python mailing list
>>> python@py.cz
>>> http://www.py.cz/mailman/listinfo/python
>>>=20
>>> Visit: http://www.py.cz
>>=20
>>=20
>>=20
>> _______________________________________________
>> Python mailing list
>> python@py.cz
>> http://www.py.cz/mailman/listinfo/python
>>=20
>> Visit: http://www.py.cz
> _______________________________________________
> Python mailing list
> python@py.cz
> http://www.py.cz/mailman/listinfo/python
>=20
> Visit: http://www.py.cz

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