Python File Handling Quiz

What is the key function for working with files in Python?

• file()

• open()

• read()

• write()

Answer explanation

The key function for working with files in Python is open(), which is used to open a file and return a file object for reading, writing, or both.

What does the 'r' mode do when opening a file in Python?

• Reads and writes to the file

• Appends to the file

• Reads the file, error if the file does not exist

• Creates the file

Answer explanation

The 'r' mode in Python opens a file for reading. It will throw an error if the file does not exist.

Which mode should be used to open a file for appending in Python?

• 'r'

• 'w'

• 'a'

• 'x'

Answer explanation

The correct mode to open a file for appending in Python is 'a', which allows writing to the end of the file without truncating it.

What happens if you try to open a file in 'x' mode and the file already exists?

• The file is overwritten

• The file is read normally

• An error is returned

• The file is appended to

Answer explanation

Opening a file in 'x' mode will return an error if the file already exists, preventing accidental overwriting of existing files.

What is the default mode when opening a file in Python?

• Binary mode

• Write mode

• Append mode

• Text mode

Answer explanation

The default mode when opening a file in Python is Text mode, which is used for reading and writing text files. It is denoted by 'r' or no mode specified.

Which mode is represented by 'b' when handling files in Python?

• Text mode

• Binary mode

• Append mode

• Create mode

Answer explanation

The 'b' mode in Python represents Binary mode, which is used for handling files containing binary data like images or executable files.

What is the correct syntax to open a file named "demofile.txt" for reading in Python?

• f = open_file("demofile.txt")

• f = open("demofile.txt", "r")

• f = read("demofile.txt")

• f = file("demofile.txt")

Answer explanation

The correct syntax to open a file named 'demofile.txt' for reading in Python is f = open('demofile.txt', 'r').

What is the default mode used when opening a file using the open() function in Python?

• A) "w"

• B) "r"

• C) "a"

• D) "rb"

Answer explanation

The default mode used when opening a file using the open() function in Python is 'r', which stands for read mode. This mode allows reading from the file.

What must you ensure before opening a file in Python to avoid an error?

• A) The file is empty

• B) The file is in write mode

• C) The file exists

• D) The file is in the same folder as the Python script

Answer explanation

Before opening a file in Python, you must ensure that the file exists to avoid an error. This is because attempting to open a non-existent file will result in a FileNotFoundError.

What method is used to read the content of a file in Python?

• A) read()

• B) open()

• C) write()

• D) close()

Answer explanation

The correct method used to read the content of a file in Python is read(). This method is used to read the entire contents of the file into a string.