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Q.4 Why does python change the datatype of a column as soon as it stores an empty value(NaN) even though it has all other values stored as integer. ... Q.5 Write code statements to list the following, from a dataframe namely sales. (a) List only columns Ítem’ and ‘Revenue’. (b) List rows from 3 to 7. (c) List the value of cell in 5th row ... ................
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