Question

Arrange the following steps to calculate the total number of values for each row of a DataFrame.
(A) Load the DataFrame as 'df'
(B) Use the df.count() method
(C) Print the result
(D) import pandas as pd
Choose the correct answer from the options given below:

• A. (D), (C), (B), (A)
• B. (D), (A), (B), (C)
• C. (D), (C), (A), (B)
• D. (C), (B), (D), (A)

Hint:

Import the library, load the data, count, then print.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
A program must follow a logical order. We first bring in the library, then we get the data, then we process it, and last we show the output. We apply this rule to the four steps.

Step 2: Place each step.
(D) import pandas as pd comes first because every pandas feature needs the library.
(A) Load the DataFrame as df comes second, since the data must exist before it is used.
(B) Use df.count() comes third, because it works on the loaded DataFrame. For the row-wise total, the call is df.count(axis=1).
(C) Print the result comes last, since there is nothing to print until the count is found.
So the order is (D), (A), (B), (C).

Step 3: Check option 1 (D, C, B, A).
It prints before counting and counts before loading the data. It fails at both places. So option 1 is wrong.

Step 4: Check option 2 (D, A, B, C).
Import, load, count, print. This is the natural order. So option 2 is correct.

Step 5: Check option 3 (D, C, A, B).
It prints the result first, before there is any data or any result. So option 3 is wrong.

Step 6: Check option 4 (C, B, D, A).
It prints first and counts before importing pandas and loading the data. So option 4 is wrong.

Step 7: Final Answer:
The correct order is (D), (A), (B), (C), which is option 2. \[ \boxed{(D),\ (A),\ (B),\ (C)} \]