经常会碰到,双击.py文件运行不了,或右键没有IDLE编辑的项,在WIN7系统中比较常见.
双击*.py文件运行不了解决办法:
右键点击 -> 打开方式 -> 选择默认程序 -> 浏览,找到并选择python.exe
右键没有IDLE项解决办法:
1. 如果PYTHON环境搭建不久,PYTHONPATH,及Lib/site-packages目录下也没有多少库文件时,可以重装
2. 修改注册表,
i. 通过regedit命令来修改注册表
代码如下:
[HKEY_CLASSES_ROOT\Python.File\shell\EditwithIDLE]
[HKEY_CLASSES_ROOT\Python.File\shell\EditwithIDLE\command]
ii. 通过批处理文件的方式修改注册表
代码如下:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Python.File\shell\EditwithIDLE]
@="&Edit with IDLE"
[HKEY_CLASSES_ROOT\Python.File\shell\EditwithIDLE\command]
@="\"C:\\Python27\\pythonw.exe\" \"C:\\Python27\\Lib\\idlelib\\idle.pyw\" -e \"%1\""
保存上面的文件到python.reg,双击一下,就会同样修改注册表,重启生效
NOTE: 替代成你自己的PYTHON安装目录就可以了。

ForhandlinglargedatasetsinPython,useNumPyarraysforbetterperformance.1)NumPyarraysarememory-efficientandfasterfornumericaloperations.2)Avoidunnecessarytypeconversions.3)Leveragevectorizationforreducedtimecomplexity.4)Managememoryusagewithefficientdata

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Inpython,YouCansspecthedatatAtatatPeyFelemereModeRernSpant.1)Usenpynernrump.1)Usenpynyp.dloatp.dloatp.ploatm64,formor professisconsiscontrolatatypes。

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Contiguousmemoryallocationiscrucialforarraysbecauseitallowsforefficientandfastelementaccess.1)Itenablesconstanttimeaccess,O(1),duetodirectaddresscalculation.2)Itimprovescacheefficiencybyallowingmultipleelementfetchespercacheline.3)Itsimplifiesmemorym

SlicingaPythonlistisdoneusingthesyntaxlist[start:stop:step].Here'showitworks:1)Startistheindexofthefirstelementtoinclude.2)Stopistheindexofthefirstelementtoexclude.3)Stepistheincrementbetweenelements.It'susefulforextractingportionsoflistsandcanuseneg

numpyallowsforvariousoperationsonArrays:1)basicarithmeticlikeaddition,减法,乘法和division; 2)evationAperationssuchasmatrixmultiplication; 3)element-wiseOperations wiseOperationswithOutexpliitloops; 4)

Arresinpython,尤其是Throughnumpyandpandas,weessentialFordataAnalysis,offeringSpeedAndeffied.1)NumpyArseNable efflaysenable efficefliceHandlingAtaSetSetSetSetSetSetSetSetSetSetSetsetSetSetSetSetsopplexoperationslikemovingaverages.2)


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