numpy.delete删除一列或多列的方法
基础介绍：
numpy.delete numpy.delete(arr,obj,axis=None)[source] Returnanewarraywithsub-arraysalonganaxisdeleted.Foraonedimensionalarray,thisreturnsthoseentriesnotreturnedbyarr[obj]. Parameters: arr:array_like Inputarray. obj:slice,intorarrayofints Indicatewhichsub-arraystoremove. axis:int,optional Theaxisalongwhichtodeletethesubarraydefinedbyobj.IfaxisisNone,objisappliedtotheflattenedarray. Returns: out:ndarray Acopyofarrwiththeelementsspecifiedbyobjremoved.Notethatdeletedoesnotoccurin-place.IfaxisisNone,outisaflattenedarray.
示例：
1.删除一列
>>>dataset=[[1,2,3],[2,3,4],[4,5,6]] >>>importnumpyasnp >>>dataset=np.delete(dataset,-1,axis=1) >>>dataset array([[1,2], [2,3], [4,5]])
2.删除多列
arr=np.array([[1,2,3,4],[5,6,7,8],[9,10,11,12]]) np.delete(arr,[1,2],axis=1) array([[1,4], [5,8], [9,12]])
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