{"id":38914,"date":"2019-10-31T22:26:43","date_gmt":"2019-10-31T19:26:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-python-3-8\/"},"modified":"2019-10-31T22:26:43","modified_gmt":"2019-10-31T19:26:43","slug":"reliz-python-3-8","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-python-3-8","title":{"rendered":"Verze Pythonu 3.8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nejzaj\u00edmav\u011bj\u0161\u00ed novinky:<\/p>\n<ul>\n<li> P\u0159i\u0159azovac\u00ed v\u00fdraz:\n<p>Nov\u00fd operator := umo\u017e\u0148uje p\u0159i\u0159azovat hodnoty prom\u011bnn\u00fdm uvnit\u0159 v\u00fdraz\u016f. Nap\u0159\u00edklad:<br \/>\nif (n := len(a)) &gt; 10:<br \/>\n    print(f\"Seznam je p\u0159\u00edli\u0161 dlouh\u00fd ({n} prvk\u016f, o\u010dek\u00e1v\u00e1no &lt;= 10)&quot;)\n<\/p>\n<\/li>\n<li> Polo\u017ekov\u011b pouze argumenty:\n<p>Nyn\u00ed je mo\u017en\u00e9 ur\u010dit, kter\u00e9 parametry funkc\u00ed mohou b\u00fdt p\u0159ed\u00e1v\u00e1ny pomoc\u00ed syntaxe pojmenovan\u00fdch argument\u016f, a kter\u00e9 nikoli. P\u0159\u00edklad:<br \/>\ndef f(a, b, \/, c, d, *, e, f):<br \/>\n    print(a, b, c, d, e, f)<\/p>\n<p>f(10, 20, 30, d=40, e=50, f=60) # OK<br \/>\nf(10, b=20, c=30, d=40, e=50, f=60)   # chyba, `b` nem\u016f\u017ee b\u00fdt pojmenovan\u00fd argument<br \/>\nf(10, 20, 30, 40, 50, f=60)           # chyba, `e` mus\u00ed b\u00fdt pojmenovan\u00fd argument<\/p>\n<p>Tato zm\u011bna d\u00e1v\u00e1 v\u00fdvoj\u00e1\u0159\u016fm zp\u016fsob, jak chr\u00e1nit u\u017eivatele sv\u00fdch API p\u0159ed zm\u011bnami v n\u00e1zvech argument\u016f funkc\u00ed.<\/p>\n<\/li>\n<li> Podpora f-\u0159et\u011bzc\u016f = pro sebedokumentuj\u00edc\u00ed v\u00fdrazy a lad\u011bn\u00ed:\n<p>P\u0159id\u00e1na syntaktick\u00e1 cukr pro zjednodu\u0161en\u00ed lad\u00edc\u00edch\/logguj\u00edc\u00edch zpr\u00e1v.<br \/>\nn = 42<br \/>\nprint(f'Zdrav\u00edm sv\u011bte {n=}.')<br \/>\n# \u043d\u0430\u043f\u0435\u0447\u0430\u0442\u0430\u0435\u0442 &quot;Hello world n=42.&quot;\n<\/p>\n<\/li>\n<li> Opraven kl\u00ed\u010dov\u00e9 slovo continue v bloku finally (d\u0159\u00edve nefungovalo).\n<\/li>\n<\/ul>\n<p>Ostatn\u00ed:\n<\/p>\n<ul>\n<li> Lze explicitn\u011b ur\u010dit cestu k mezipam\u011bti bajtk\u00f3du m\u00edsto v\u00fdchoz\u00edho __pycache__.\n<\/li>\n<li> Debug a Release sestaven\u00ed pou\u017e\u00edvaj\u00ed stejn\u00fd ABI.\n<\/li>\n<\/ul>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/development\/15290190\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430: \u041f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u044e\u0449\u0435\u0435 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435: \u041d\u043e\u0432\u044b\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 := \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u043c \u0432\u043d\u0443\u0442\u0440\u0438 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0439. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440: if (n := len(a)) &gt; 10: print(f&quot;List is too long ({n} elements, expected &lt;= 10)&quot;) Positional-only \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u044b: \u0422\u0435\u043f\u0435\u0440\u044c \u043c\u043e\u0436\u043d\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c, \u043a\u0430\u043a\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u043c\u043e\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0432\u0430\u0442\u044c \u0447\u0435\u0440\u0435\u0437 \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u043e\u0432, \u0430 \u043a\u0430\u043a\u0438\u0435 \u043d\u0435\u0442. \u041f\u0440\u0438\u043c\u0435\u0440: def f(a, b, \/, c, d, *, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-38914","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0435 \u043d\u043e\u0432\u0448\u0435\u0441\u0442\u0432\u0430: \u041f\u0440\u0438\u0441\u0432\u0430\u0438\u0432\u0430\u044e\u0449\u0435\u0435 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