Decorators & Generators in Python Quiz – 15 Questions with Answers
15 questions · 12 min · Medium
File I/O in Python
Test your knowledge of File I/O in Python, including opening files, reading and writing data, file modes, context managers, file methods, and handling text and binary files.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. Which built-in function is used to open a file in Python?
- A. file()
- B. open()
- C. openFile()
- D. readFile()
Show answer
B. open()
The built-in open() function is used to open a file and return a file object.
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2. Which file mode opens a file for reading?
- A. w
- B. a
- C. r
- D. x
Show answer
C. r
The r mode opens a file for reading. It is the default mode when no mode is explicitly specified.
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3. Which file mode opens a file for writing and truncates it if it already exists?
- A. r
- B. w
- C. a
- D. x
Show answer
B. w
The w mode opens a file for writing and truncates the existing file if it already exists. If the file does not exist, it is created.
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4. Which file mode opens a file for appending data to its end?
- A. r
- B. w
- C. a
- D. x
Show answer
C. a
The a mode opens a file for appending. New data is written at the end of the file.
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5. Which method reads the entire remaining contents of a text file?
- A. read()
- B. readline()
- C. readall()
- D. get()
Show answer
A. read()
The read() method reads and returns the requested amount of data, or the remaining contents when no size is specified.
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6. Which method reads a single line from a file?
- A. readline()
- B. readlineFile()
- C. line()
- D. readlineOnly()
Show answer
A. readline()
readline() reads one line from the file, including the newline character when present.
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7. Which method can be used to read all lines of a file into a list?
- A. readlines()
- B. allLines()
- C. getlines()
- D. readlist()
Show answer
A. readlines()
readlines() reads the remaining lines and returns them as a list of strings.
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8. Which method is used to write a string to a file?
- A. write()
- B. printFile()
- C. writeText()
- D. put()
Show answer
A. write()
The write() method writes a string to the file and returns the number of characters written for text files.
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9. What is the main purpose of using a `with` statement when working with files?
- A. It automatically closes the file when the block is exited
- B. It makes all files read-only
- C. It prevents files from being created
- D. It converts text files into binary files
Show answer
A. It automatically closes the file when the block is exited
The with statement uses a context manager, ensuring that the file is properly closed when the block is exited, including in many error situations.
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10. Which mode is used to work with a file as binary data?
- A. t
- B. b
- C. binary
- D. raw
Show answer
B. b
The b mode indicates binary I/O. It is commonly combined with another mode, such as rb or wb.
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11. What happens when `open('data.txt', 'x')` is used and the file already exists?
- A. The existing file is truncated
- B. Data is appended to the file
- C. A FileExistsError is raised
- D. The file is opened for reading
Show answer
C. A FileExistsError is raised
The x mode is used for exclusive creation. It creates a new file and raises FileExistsError if the file already exists.
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12. Which method changes the current position in a file?
- A. seek()
- B. move()
- C. position()
- D. goto()
Show answer
A. seek()
The seek() method changes the file's current position to a specified location.
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13. Which method returns the current position in a file?
- A. position()
- B. tell()
- C. current()
- D. where()
Show answer
B. tell()
The tell() method returns the current file position as an integer.
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14. Which statement correctly opens a file for reading and writing text?
- A. open('data.txt', 'r')
- B. open('data.txt', 'w')
- C. open('data.txt', 'r+')
- D. open('data.txt', 'a')
Show answer
C. open('data.txt', 'r+')
The r+ mode opens an existing file for both reading and writing without truncating it.
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15. What is a common result of calling `file.close()`?
- A. The file object is closed and should no longer be used for I/O
- B. The file is permanently deleted
- C. The file contents are automatically erased
- D. The file is reopened in read mode
Show answer
A. The file object is closed and should no longer be used for I/O
close() closes the file object and releases associated resources. Attempting further I/O through the closed file generally raises an error.