Standardní knihovna pro Python - 8 (regulární výrazy 1) (diskuse)

[Jiří P.]

Pro skládání reg. výrazů a jejich odladění se mi velice osvědčil prográmek kodos.

[happy barney]

re.match(r"(19|20)[0-9]{2}", retezec)
 # vyhleda letopocet mezi roky 1900 a 2050

hmm, možno tak v pythone ) Všade inde by bolo treba opraviť buď prvý riadok

m/(?:19\d{2})|(?:20[0-4]\d)|2050/

alebo druhý riadok

 # vyhleda letopocet mezi roky 1900 a 2099 (vrátane)

[Jakub Matys]

Omlouvam se - chybicka se vloudila. V komentari melo opravdu byt 1900 az 2099.

[happy barney]

btw, aj tie hexa čísla sú nejaký zvláštny regexp. Autor mohol predviesť ignore-case match

m/^(?:0|(?!0)[0-9a-f]+)$/i

[mj41]

Jak se da v Pythonu jednoduse udelat Perlovske:

die "Zadany retezec neobsahuje letopocet od 1900 do 2099.\n" if $retezec !~ /(19|20)[0-9]{2}/;

?

[Jan Martinek]

třeba takhle

#!/usr/bin/env python
import re
year_str = '1801d'
if not re.match('(19|20)[0-9]{2}', year_str):
    raise SystemExit, 'Chyba formatu letopoctu'

nebo takhle

year_str = '1801d'
try:
    rok = int(year_str)    
except ValueError:
    raise SystemExit, '"%s" nelze prevest na cislo.' %year_str

if rok < 1900 or rok > 2099:
    raise SystemExit, 'Rok %d je mimo interval 1900 a 2099.' %rok

[Michal Vyskočil]

Afaik volání die prostě ukončí interpreter Perlu, takže v Pythonu by tomu odpovídalo exit. Výjimka se dá pomocí except zachytit a zpracovat ... <rejp>
Při vyvolávání výjimky si typicky objekt reprezentující výjimku vytvářím -- doporučuje se zápis vyjadřující konstrukci nového objektu
py.cz
</rejp>

[ahmedsayeed1982]

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