File Handling in Python

Topics in this chapter

• Text File Reading
• File Modes and Context Managers
• Text File Writing
• File Pointers and Positioning
• Line Processing and CSV
• Binary Files and Pickle

Cheat sheet

Practice questions

1. Question 1Q-1625A6

   Which file mode opens a text file for writing by adding new data at the end without deleting its existing contents?

   1. A.r
   2. B.a
   3. C.w
   4. D.r+
   See the answer and solution
2. Question 2Q-016F70

   Consider the following Python code: with open("marks.txt", "w") as f: f.write("CBSE12") with open("marks.txt", "r") as f: print(f.read(3)) print(f.tell()) What will be displayed?

   1. A.CBSE 3
   2. B.CBS 3
   3. C.CBS 6
   4. D.CB 2
   See the answer and solution
3. Question 3Q-63D8E5

   Explain the purpose of the seek() and tell() functions when working with a file in Python.

   See the answer and solution
4. Question 4Q-C8C3F1

   When the file pointer has reached the end of a text file, what does readline() return?

   1. A.None
   2. B.An empty string
   3. C.-1
   4. D.An empty list
   See the answer and solution
5. Question 5Q-61CA91

   What type of data is returned when a file is opened using open("data.bin", "rb") and its contents are read?

   1. A.A string
   2. B.A bytes object
   3. C.A list of characters
   4. D.A dictionary
   See the answer and solution