什么是pyc文件
pyc是一種二進(jìn)制文件,是由py文件經(jīng)過編譯后,生成的文件,是一種byte code,py文件變成pyc文件后,加載的速度有所提高,而且pyc是一種跨平臺的字節(jié)碼,是由python的虛擬機(jī)來執(zhí)行的,這個(gè)是類似于JAVA或者.NET的虛擬機(jī)的概念。pyc的內(nèi)容,是跟python的版本相關(guān)的,不同版本編譯后的pyc文件是不同的,2.5編譯的pyc文件,2.4版本的 python是無法執(zhí)行的。
什么是pyo文件
pyo是優(yōu)化編譯后的程序 python -O 源文件即可將源程序編譯為pyo文件
什么是pyd文件
pyd是python的動態(tài)鏈接庫。
這里的pyo 優(yōu)化后的字節(jié)碼?這種優(yōu)化怎么理解,還有就是pyd 這個(gè)編譯的動態(tài)鏈接庫如何理解?
pyo
優(yōu)化:-O
flag, optimized code is generated and stored in .pyo
files. The optimizer currently doesn't help much; it only removes assert statements. When -O
is used, all bytecode is optimized; .pyc
files are ignored and .py
files are compiled to optimized bytecode.-O
flags to the Python interpreter (-OO
) will cause the bytecode compiler to perform optimizations that could in some rare cases result in malfunctioning programs. Currently only __doc__
strings are removed from the bytecode, resulting in more compact .pyo
files. Since some programs may rely on having these available, you should only use this option if you know what you're doing..pyc
or .pyo
file than when it is read from a .py
file; the only thing that's faster about .pyc
or .pyo
files is the speed with which they are loaded..pyc
or .pyo
file. Thus, the startup time of a script may be reduced by moving most of its code to a module and having a small bootstrap script that imports that module. It is also possible to name a .pyc
or .pyo
file directly on the command line.pyd
:pyd
可以理解為 Windows DLL
文件。
.pyd
files are dll’s, but there are a few differences. If you have a DLL
named foo.pyd
, then it must have a function PyInit_foo()
. You can then write Python "import foo"
, and Python will search for foo.pyd
(as well as foo.py
, foo.pyc
) and if it finds it, will attempt to call PyInit_foo()
to initialize it. You do not link your .exe
with foo.lib
, as that would cause Windows to require the DLL
to be present.foo.pyd
is PYTHONPATH
, not the same as the path that Windows uses to search for foo.dll
. Also, foo.pyd
need not be present to run your program, whereas if you linked your program with a dll
, the dll
is required. Of course, foo.pyd
is required if you want to say import foo
. In a DLL
, linkage is declared in the source code with __declspec(dllexport)
. In a .pyd
, linkage is defined in a list of available functions.北大青鳥APTECH成立于1999年。依托北京大學(xué)優(yōu)質(zhì)雄厚的教育資源和背景,秉承“教育改變生活”的發(fā)展理念,致力于培養(yǎng)中國IT技能型緊缺人才,是大數(shù)據(jù)專業(yè)的國家
北大青鳥中博軟件學(xué)院創(chuàng)立于2003年,作為華東區(qū)著名互聯(lián)網(wǎng)學(xué)院和江蘇省首批服務(wù)外包人才培訓(xùn)基地,中博成功培育了近30000名軟件工程師走向高薪崗位,合作企業(yè)超4
中公教育集團(tuán)創(chuàng)建于1999年,經(jīng)過二十年潛心發(fā)展,已由一家北大畢業(yè)生自主創(chuàng)業(yè)的信息技術(shù)與教育服務(wù)機(jī)構(gòu),發(fā)展為教育服務(wù)業(yè)的綜合性企業(yè)集團(tuán),成為集合面授教學(xué)培訓(xùn)、網(wǎng)
達(dá)內(nèi)教育集團(tuán)成立于2002年,是一家由留學(xué)海歸創(chuàng)辦的高端職業(yè)教育培訓(xùn)機(jī)構(gòu),是中國一站式人才培養(yǎng)平臺、一站式人才輸送平臺。2014年4月3日在美國成功上市,融資1
浪潮集團(tuán)項(xiàng)目經(jīng)理。精通Java與.NET 技術(shù), 熟練的跨平臺面向?qū)ο箝_發(fā)經(jīng)驗(yàn),技術(shù)功底深厚。 授課風(fēng)格 授課風(fēng)格清新自然、條理清晰、主次分明、重點(diǎn)難點(diǎn)突出、引人入勝。
曾工作于聯(lián)想擔(dān)任系統(tǒng)開發(fā)工程師,曾在博彥科技股份有限公司擔(dān)任項(xiàng)目經(jīng)理從事移動互聯(lián)網(wǎng)管理及研發(fā)工作,曾創(chuàng)辦藍(lán)懿科技有限責(zé)任公司從事總經(jīng)理職務(wù)負(fù)責(zé)iOS教學(xué)及管理工作。
精通HTML5和CSS3;Javascript及主流js庫,具有快速界面開發(fā)的能力,對瀏覽器兼容性、前端性能優(yōu)化等有深入理解。精通網(wǎng)頁制作和網(wǎng)頁游戲開發(fā)。
具有10 年的Java 企業(yè)應(yīng)用開發(fā)經(jīng)驗(yàn)。曾經(jīng)歷任德國Software AG 技術(shù)顧問,美國Dachieve 系統(tǒng)架構(gòu)師,美國AngelEngineers Inc. 系統(tǒng)架構(gòu)師。