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16 / 30Working with Files: Read and WriteMediumPython Basics

What is the primary purpose of opening a file in read mode ('r') in Python?

  1. To read the contents of an existing file without making changes to it

  2. To create a new file and write data to it automatically

  3. To delete the file contents and prepare for new data

  4. To append data to the end of a file without overwriting existing content

Show answer & explanation

Correct answer

To read the contents of an existing file without making changes to it

Explanation

Read mode allows reading existing file content without modification.

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All 30 Working with Files: Read and Write questions

  1. 1.What is the primary purpose of the open() function in Python file operations?
  2. 2.What does the 'r' mode do when opening a file with the open() function?
  3. 3.What is the difference between the 'w' mode and the 'a' mode in file operations?
  4. 4.Why is it important to close a file after reading or writing to it?
  5. 5.What does the read() method return when called on a file object?
  6. 6.What does the readline() method do differently from the read() method?
  7. 7.What does the readlines() method return from a file object?
  8. 8.How does the write() method behave when writing to a file opened in 'w' mode?
  9. 9.What is the purpose of using the with statement when working with files?
  10. 10.What does the write() method return after successfully writing to a file?
  11. 11.What happens if you try to read from a file that is opened in 'w' mode?
  12. 12.What is the purpose of the 'b' flag when used with file modes like 'rb' or 'wb'?
  13. 13.What does the seek() method allow you to do in a file?
  14. 14.What does the tell() method return when called on a file object?
  15. 15.What is the difference between text mode and binary mode when opening files?
  16. 16.What is the primary purpose of opening a file in read mode ('r') in Python?
  17. 17.What does the write() method return when successfully writing data to a file in Python?
  18. 18.What is the difference between the 'w' and 'a' file modes when opening a file in Python?
  19. 19.Predict the output:
  20. 20.What issue does Prasath's code have, and how should it be corrected?
  21. 21.What is the purpose of using the with statement (context manager) when working with files in Python?
  22. 22.Predict what will happen when Arjun executes this code that reads a non-existent file?
  23. 23.What does the readline() method do differently compared to readlines() in Python file operations?
  24. 24.What will be the result of executing Vikram's code that writes multiple lines to a file?
  25. 25.How should Deepak modify his code to ensure the file is properly closed even if an exception occurs during file operations?
  26. 26.What is the primary purpose of opening a file in read mode ('r') versus write mode ('w') in Python file operations?
  27. 27.Predict the output of the following code snippet when Hari executes it with a file containing three lines of text?
  28. 28.What will be the result when Prasath runs this code that attempts to read from a non-existent file without proper exception handling?
  29. 29.How should Deepak modify his code to ensure that a file is properly closed even if an exception occurs while reading it?
  30. 30.What is the difference in behavior when Ananya uses `write()` versus `writelines()` methods to store data in a file?