File Handling | 15/100 Days of Python Algo Trading

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If you’re here, it means you’re truly dedicated to mastering Python. Directly below, you’ll find a quiz designed to help you reinforce what you’ve just learned. This isn’t just about recalling facts; it’s about deeply understanding the concepts. Take a moment to answer the questions and see how well you can apply the knowledge from the video. You’re doing great—every question you tackle brings you one step closer to becoming a Python expert!

Day 15: File Handling

1. What is a common use case of file handling in algorithmic trading?

A) To execute trades directly on the exchange

B) To store historical trade data for analysis

C) To increase the processing speed of trades

D) To interact with the user interface

2. Which file mode in Python can be used to append data at the end of the file?

A) 'r'

B) 'w'

C) 'a'

D) 'x'

3. How do you open a file for reading and writing in Python without creating a new file if it exists?

A) open('file.txt', 'r+')

B) open('file.txt', 'w+')

C) open('file.txt', 'a+')

D) Both A and B

4. What is the correct way to ensure a file is closed after operations are completed in Python?

A) file.close()

B) file.exit()

C) file.end()

D) file.finish()

5. Which method would you use to write data to a file in Python?

A) file.write(data)

B) file.save(data)

C) file.record(data)

D) file.push(data)

6. What is the benefit of using a context manager when working with files in Python?

A) It automatically handles file exceptions

B) It compresses file data for storage

C) It encrypts file data for security

D) It ensures that the file is properly closed after finishing or when an exception occurs

7. What does the 'w+' mode do when opening a file?

A) Opens the file for both reading and writing, creates the file if it does not exist

B) Opens the file for writing only, creates the file if it does not exist

C) Opens the file for writing only, truncates the file to zero length if it exists

D) Opens the file for both reading and writing, truncates the file to zero length if it exists

8. How can you ensure that written data is saved to a file immediately in Python?

A) file.save()

B) file.commit()

C) file.flush()

D) file.write_immediately()

9. In Python, how would you read a file line by line?

A) file.readline()

B) for line in open('file.txt'):

C) file.read_lines()

D) file.readlines()

10. What is the effect of opening a file in 'x' mode?

A) Opens the file for exclusive creation, failing if the file already exists

B) Extracts the content of the file exclusively

C) Excludes the file from being opened by other processes

D) Extends the file size to the maximum allowed

11. Which mode should you choose to open a file for binary writing?

A) 'w'

B) 'wb'

C) 'w+'

D) 'wb+'

12. What would happen if you try to open a file in mode 'r' that does not exist?

A) Python creates the file.

B) Python throws an IOError.

C) Python opens the file in write mode instead.

D) Python throws a FileNotFoundError.

13. What is the main reason to use binary mode ('b') for file operations in Python?

A) To encrypt the file content

B) To handle non-text files such as images and executable files

C) To compress the file content

D) To prevent file corruption

14. How do you delete a file in Python?

A) delete('filename')

B) file.delete('filename')

C) os.remove('filename')

D) file.remove('filename')

15. What Python method would you use to read the entire contents of a file into a string?

A) file.read()

B) file.read_all()

C) file.get_all()

D) file.load()

16. How can you read the first 5 lines of a file in Python?

A) [file.readline() for _ in range(5)]

B) file.read(5)

C) file.readlines(5)

D) file.getlines(5)

17. What is the correct way to write a list of lines to a file in Python?

A) file.writelines(lines)

B) file.write(lines)

C) file.lineswrite(lines)

D) file.putlines(lines)

18. Which statement about file handling is NOT correct?

A) The 'a+' mode allows reading and appending without truncation.

B) The 'r+' mode can truncate the file.

C) The 'w' mode cannot create new files.

D) The 'x' mode can cause an error if the file exists.

19. When should you prefer using 'with' for file handling in Python?

A) When you want to ensure files are not automatically closed

B) When the file operations are simple and do not need explicit closure

C) Always, as it provides better handling of file closure and exception management

D) Only when working with binary files

20. What function allows multiple files to be handled at the same time in Python?

A) file.multiple()

B) open()

C) open_many()

D) Using multiple with statements

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