Video: Puas yog tuple muaj index?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Tuples yog cov kab ke, ib yam li cov npe. Qhov txawv ntawm tuples thiab lis yog , cov tuples tsis tuaj yeem hloov pauv tsis zoo li cov npe thiab tuples siv cov parentheses, hos cov npe siv square brackets. Zoo li txoj hlua ntsuas , cov indices pib ntawm 0, thiab lawv tuaj yeem hlais, sib txuas, thiab lwm yam.
Raws li, koj tuaj yeem ntsuas tus tuple Python?
Cov nqi khaws cia hauv a tuple ua ua txhua yam, thiab lawv yog ua indexed los ntawm tus lej. Qhov txawv tseem ceeb yog qhov ntawd tuples yog immutable. Tuples kuj piv tau thiab hashable li ntawd peb ua tau txheeb cov npe ntawm lawv thiab siv tuples raws li qhov tseem ceeb hauv Python phau ntawv txhais lus.
Qhov thib ob, koj txhais li cas tuple hauv Python? A tuple yog tsim los ntawm kev tso tag nrho cov khoom (cov ntsiab lus) hauv kab lus (), sib cais los ntawm commas. Cov kab lus yog xaiv tau, txawm li cas los xij, nws yog ib qho kev xyaum zoo siv lawv. A tuple tuaj yeem muaj tus lej ntawm cov khoom thiab lawv yuav muaj ntau hom (tus lej, ntab, npe, hlua, thiab lwm yam).
Li ntawd, puas tuples muaj kev txiav txim?
A tuple yog txhais ua tib yam li ib daim ntawv teev npe, tshwj tsis yog tias tag nrho cov ntsiab lus tau muab kaw rau hauv lub voj voog es tsis txhob square brackets. Cov ntsiab lus ntawm a tuple muaj ib txhais xaj , zoo li ib daim ntawv teev npe. Tuples indices yog xoom-raws li, ib yam li ib daim ntawv teev npe, yog li thawj lub ntsiab ntawm qhov tsis muaj qhov khoob tuple yog ib txwm t[0].
Dab tsi yog qhov txawv ntawm tuple thiab daim ntawv teev npe?
Lub ntsiab qhov sib txawv ntawm cov npe thiab a tuples yog qhov tseeb tias cov npe yog mutable whereas tuples yog immutable. Ib hom ntaub ntawv mutable txhais tau hais tias cov khoom python ntawm hom no tuaj yeem hloov kho. Ib yam khoom tsis hloov tsis tau.
Pom zoo:
Muaj pes tsawg theem ntawm indirection nyob rau hauv pointers koj muaj peev xwm muaj nyob rau hauv ib qho kev tshaj tawm?
Koj puas tuaj yeem muaj nyob rau hauv ib qho kev tshaj tawm? cov lus teb yog "tsawg kawg 12." txhawb ntxiv. ntawm saj, tab sis muaj qhov txwv. Muaj ob theem ntawm kev taw qhia (tus taw tes rau tus taw tes rau ib yam dab tsi) yog qhov ntau
Ib qho chaw tsis muaj zog puas tuaj yeem muaj qhov chaw tsis muaj zog?
Hom chaw tsis muaj zog muaj qee qhov yuam sij. Nco tseg- Lub koom haum tsis muaj zog ib txwm muaj kev koom tes tag nrho tab sis lub koomhaum muaj zog yuav tsis muaj tag nrho kev koom tes.Weak entity yog nyob ntawm qhov chaw muaj zog kom ntseeg tau tias muaj qhov tsis muaj zog. Zoo li lub koom haum muaj zog, qhov tsis muaj zog tsis muaj qhov tseem ceeb, Nws muaj feem cuam tshuam kev ntxub ntxaug
Puas yog kev muaj tiag sib xyaw tib yam li kev muaj tiag virtual?
Virtual kev muaj tiag (VR) immerses cov neeg siv nyob rau hauv ib tug tag nrho cov khoom siv dag zog ib puag ncig. Augmented reality (AR) overlays virtual objects on the real-world environment.Mixed reality (MR) tsis yog overlays tab sis anchorsvirtual objects rau lub ntiaj teb tiag
Puas yog Torrenting muaj kev nyab xeeb yam tsis muaj VPN?
Txawm hais tias koj yuav hnov los yog nyeem, nws tsis yog OK totorrent yam tsis muaj VPN lossis BitTorrent npe. Totorrent yam tsis muaj VPN thov kom muaj teeb meem. Khaws koj qhov kev nyab xeeb nrog NordVPN
Index yog dab tsi thiab tsim index hauv SQL?
SQL CREATE INDEX Nqe Lus Qhia. Daim ntawv CREATE INDEX yog siv los tsim indexes hauv cov ntxhuav. Indexs yog siv los muab cov ntaub ntawv los ntawm cov ntaub ntawv sai dua li lwm yam. Nco tseg: Kev hloov kho lub rooj nrog indexes siv sijhawm ntau dua li hloov kho lub rooj yam tsis muaj (vim cov indexes tseem xav tau hloov tshiab)