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Q.5 How to swap two columns in a 2d numpy array? (Swap columns 1 and 2 in the array arr). Q.6 Consider the following ndarrays: ... Q.9How to sort a 2D array by a column? Q.10 Consider following ndarrays: A=array([10,20,30,40,50,60,70,80,90]) ... Q.4 Why does python change the datatype of a column as soon as it stores an empty value(NaN) even ... ................
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