Files

Question 1

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

Answer 1

The read() method.

Question 2

True or False: The read() method can take an argument specifying the number of bytes to read.

Answer 2

True.

Question 3

How do you open a file for reading in Python?

Answer 3

Use the open() function with ‘r’ mode.

Question 4

What is the default mode for the open() function?

Answer 4

‘r’ (read mode).

Question 5

Fill in the blank: To write to a file, you must open it in _____ mode.

Answer 5

‘w’ (write mode).

Question 6

What method is used to read a CSV file in Python?

Answer 6

The csv.reader() method.

Question 7

What library do you need to import to work with CSV files in Python?

Answer 7

The csv library.

Question 8

True or False: The json library in Python is used to handle JSON data.

Answer 8

True.

Question 9

What method is used to convert a Python object to a JSON string?

Answer 9

The json.dumps() method.

Question 10

How do you write a JSON object to a file in Python?

Answer 10

Use json.dump() method.

Question 11

What method is used to read a JSON file in Python?

Answer 11

The json.load() method.

Question 12

What function is used to open a file in write mode and create it if it does not exist?

Answer 12

The open() function with ‘w’ mode.

Question 13

Fill in the blank: The _____ method is used to write a row to a CSV file.

Answer 13

writerow()

Question 14

What does the writeheader() method do in the csv module?

Answer 14

It writes the header row to the CSV file.

Question 15

Which method would you use to read a specific number of lines from a file?

Answer 15

The readline() method.

Question 16

True or False: The write() method can only append data to a file.

Answer 16

False.

Question 17

What does the ‘a’ mode do when opening a file?

Answer 17

It opens the file for appending data.

Question 18

What method would you use to read all lines from a file into a list?

Answer 18

The readlines() method.

Question 19

How do you ensure that a file is properly closed after opening it?

Answer 19

Use a with statement.

Question 20

True or False: You can use the csv.DictReader() to read CSV files into a dictionary format.

Answer 20

True.

Question 21

What is the purpose of the newline parameter in the open() function?

Answer 21

It controls how universal newlines work.

Question 22

Fill in the blank: The _____ method is used to write a string to a file.

Answer 22

write()

Question 23

What Python function would you use to check if a file exists before opening it?

Answer 23

The os.path.exists() function.

Question 24

What is the difference between read() and readlines()?

Answer 24

read() returns the entire file as a string, while readlines() returns a list of lines.

Question 25

How can you specify the delimiter when reading a CSV file?

Answer 25

By passing the delimiter argument to csv.reader().

Question 26

True or False: The json.loads() method is used to parse a JSON string.

Answer 26

True.

Question 27

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

Answer 27

It opens the file for both reading and writing.

Question 28

What is the significance of the 'encoding' parameter when opening files?

Answer 28

It specifies the file's character encoding.

Question 29

Fill in the blank: To read JSON data from a file, you would use _____ followed by load().

Answer 29

open()

Question 30

What method can be used to write multiple rows to a CSV file at once?

Answer 30

The writerows() method.