Video: Puas yog Python zoo rau kev sib txuam?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Python tsis heev zoo rau CPU-bound ua ke programming. GIL yuav (ntau zaus) ua rau koj qhov kev pabcuam ua haujlwm zoo li nws tau khiav ntawm ib qho tseem ceeb - lossis tseem phem dua. Yog tias koj daim ntawv thov yog I / O-bound, Python tej zaum yuav yog ib qho kev daws teeb meem loj raws li GIL ib txwm tso tawm thaum ua thaiv kev hu.
Kuj paub yog, Python puas txhawb kev sib koom ua ke?
Python ua muaj cov tsev qiv ntawv built-in rau feem ntau ua ke programming constructs - multiprocessing thiab multithreading. Qhov laj thawj yog, multithreading hauv Python tsis yog multithreading tiag tiag, vim GIL hauv Python.
Ib tug kuj yuav nug, yog vim li cas multithreading tsis ua tau nyob rau hauv python? Tus neeg txhais lus CPython (rau ntshiab Python code) yuav yuam kom GIL tso tawm txhua pua byte cov lus qhia. Nws tsuas yog tso cai rau ib txoj xov los khiav ib zaug hauv tus neeg txhais lus. Yog li multiprocessing tsis multithreading yuav cia koj mus cuag qhov tseeb concurrency.
Tom qab ntawd, lo lus nug yog, Python puas zoo rau kev sib txuas lus?
Python tsis pub ntau txoj xov nyob rau hauv qhov tseeb ntawm lo lus. Nws muaj ib ntau txoj xov pob tab sis yog tias koj xav tau ntau xov kom ceev koj cov cai, ces feem ntau nws tsis yog zoo tswv yim siv nws. Python muaj ib lub tsev hu ua Global Interpreter Lock (GIL).
Cov module twg tuaj yeem siv los ua qhov sib txuam hauv Python 3?
Cov ua ke . yav tom ntej module tau ntxiv rau hauv Python 3.2. Raws li cov Python cov ntaub ntawv nws muab tus tsim tawm nrog rau theem siab interface rau asynchronously executing callables.
Pom zoo:
Kev sib cav sib ceg sib txawv li cas ntawm kev sib cav tsis zoo?
Txhua qhov kev sib cav tsis zoo siv txoj cai invalid inference. Yog tias qhov kev sib cav tsis zoo koj paub tias nws tsis siv. Kev siv tau txhais tau tias tsis muaj kev txhais lus qhov twg qhov chaw muaj tseeb thiab qhov kev txiav txim siab tuaj yeem tsis tseeb ib txhij. Yog tias qhov kev sib cav ua txhaum koj tuaj yeem tsis quav ntsej nws thiab sim nkag siab lub ntsiab lus tseem
Vim li cas kev sib raug zoo algebra siv nyob rau hauv kev sib raug zoo database tswj?
RELATIONAL ALGEBRA yog ib hom lus nug uas siv dav heev. Nws sau cov xwm txheej ntawm kev sib raug zoo raws li kev tawm tswv yim thiab muab qhov tshwm sim ntawm kev sib raug zoo raws li cov zis. Nws siv ntau yam haujlwm los ua qhov haujlwm no. Relational algebra operations yog ua recursively ntawm kev sib raug zoo
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm
Dab tsi yog qhov sib txawv tseem ceeb ntawm kev sib txuas lus tsis sib xws thiab kev sib txuas lus taw qhia?
1. Hauv kev sib txuas lus tsis muaj kev sib txuas lus tsis tas yuav tsim kev sib txuas ntawm qhov chaw (sender) thiab qhov chaw (receiver). Tab sis nyob rau hauv kev sib txuas-taw qhia kev sib txuas lus kev sib txuas lus yuav tsum tau tsim ua ntej hloov cov ntaub ntawv