MCQ IN COMPUTER SCIENCE & ENGINEERING

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COMPUTER SCIENCE AND ENGINEERING

DATA STRUCTURES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What will the following statement do?df ____ grades.index = ["Amna"]
A
It will add name amna in dataframe
B
It will add grades for Amna
C
It will add Amna as a new row header for index 0
D
It will delete Amna from data frame
Explanation: 

Detailed explanation-1: -Pandas provides a suite of methods in order to get purely integer based indexing. The semantics follow closely python and numpy slicing. These are 0-based indexing. When slicing, the start bounds is included, while the upper bound is excluded.

Detailed explanation-2: -Definition and Usage. The index property returns the index information of the DataFrame. The index information contains the labels of the rows. If the rows has NOT named indexes, the index property returns a RangeIndex object with the start, stop, and step values.

Detailed explanation-3: -set index() is used to set a new index to the DataFrame. It is also used to extend the existing DataFrame, i.e., we can update the index by append to the existing index. We need to use the append parameter of the DataFrame. set index() function to append the new index to the existing one.

Detailed explanation-4: -You can change all column/index names by set axis() method of pandas. DataFrame . Specify new column/index names as the first parameter labels in a list-like object such as list or tuple . Setting the parameter axis to 0 or ‘index’ updates index, and setting it to 1 or columns updates columns .

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