Question

Sequence the steps to append data to an existing file and then read the entire file:
(A) Open the file in a+ mode.
(B) Use the read() method to output the contents.
(C) Use the write() or writelines() method to append data.
(D) Seek to the beginning of the file.

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

Hint:

When appending and reading a file, always make sure to move the file pointer to the beginning using \texttt{seek(0)} before reading the file after appending data.

Answer 1

The Correct Option is A

Step 1: Open the file in a+ mode.
To append data to an existing file and then read it, we need to open the file in \texttt{a+} mode. This mode allows both appending and reading the file.
Step 2: Append data using write() or writelines().
Once the file is open in \texttt{a+} mode, we can use the \texttt{write()} or \texttt{writelines()} method to append data to the file.
Step 3: Seek to the beginning of the file.
After appending the data, we need to move the file pointer to the beginning using \texttt{seek(0)}. This allows us to read from the start of the file.
Step 4: Read the file contents using read().
Finally, we use the \texttt{read()} method to read and output the contents of the file from the beginning.
Step 5: Conclusion.
The correct sequence is: 1. (A) Open the file → 2. (C) Append data → 3. (D) Seek to beginning → 4. (B) Read contents.
Final Answer: \[ \boxed{\text{The correct sequence is (A), (C), (D), (B).}} \]