Video: Kuv yuav nkag mus rau Namedtuple li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
1. Nkag mus los ntawm index: Tus nqi ntawm tus nqi npe tup () raug txiav txim thiab tuaj yeem nkag tau siv tus lej ntsuas tsis zoo li phau ntawv txhais lus uas tsis tuaj yeem nkag los ntawm qhov ntsuas. 2. Nkag mus los ntawm keyname: Nkag mus los ntawm lub npe tseem ceeb kuj tso cai raws li hauv phau ntawv txhais lus.
Ntxiv mus, Namedtuple ua haujlwm Python li cas?
Lub npe hauv Python . Python txhawb nqa hom ntim xws li phau ntawv txhais lus hu ua " cov npe ()" tam sim no nyob rau hauv module, "sau". Zoo li phau ntawv txhais lus lawv muaj cov yuam sij uas hashed rau tus nqi tshwj xeeb. Tab sis ntawm qhov tsis sib xws, nws txhawb nqa ob qho tib si nkag los ntawm tus nqi tseem ceeb thiab iteration, lub functionality uas phau ntawv txhais lus tsis muaj.
Ib yam li ntawd, lub npe tuple yog dab tsi? npe tuples yog qhov yooj yim-rau-tsim, lub teeb yam khoom hom. npe tuple piv txwv tuaj yeem siv tau siv cov khoom zoo li qhov sib txawv ntawm qhov sib txawv los yog tus qauv tuple syntax. Lawv tuaj yeem siv tau zoo sib xws rau cov qauv lossis lwm hom ntaub ntawv, tshwj tsis yog tias lawv hloov tsis tau.
Hauv qhov no, koj yuav ua li cas thiaj tsim tau Namedtuple hauv Python?
Rau tsim a npe tup , import cov npe tup chav kawm los ntawm cov collections module. Lub constructor siv lub npe ntawm tus npe tup (uas yog hom () yuav qhia), thiab ib txoj hlua uas muaj cov npe npe, sib cais los ntawm qhov chaw dawb. Nws rov qab los tshiab npe tup chav kawm rau cov teb uas tau teev tseg.
Yuav ua li cas tuples immutable?
Python tuples muaj qhov xav tsis thoob: lawv yog hloov tsis tau , tab sis lawv qhov tseem ceeb yuav hloov. Qhov no yuav tshwm sim thaum a tuple tuav ib qho kev siv rau txhua yam khoom sib hloov, xws li daim ntawv teev npe. Nws yog qhov tseeb tias dum thiab dee hais txog cov khoom sib npaug, tab sis tsis yog rau tib yam khoom. Lawv muaj nyias tus kheej.
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