7. a) Reading and writing file (Quiz)

Question 1 of 12

State whether the following statement is true or not – “r+ mode opens a file in both read and write mode” ?

a) True
b) False

Question 2 of 12

If a file is opened in “a” append mode where does the file pointer points?

a) At the end
b) At the start
c) At the middle
d) None of these

Question 3 of 12

What is the correct syntax of open() function?

a) file = open( access_mode [, file_name])
b) file_object_name = open(file_name [, access_mode])
c) open(file_object_name, file_name)
d) None of the above

Question 4 of 12

Which of the following command is used to open a file “c:/temp.txt” in append-mode?

a) outfile = open(“c:/temp.txt”, “a”)
b) outfile = open(“c:\\temp.txt”, “rw”)
c) outfile = open(“c:\temp.txt”, “w+”)
d) outfile = open(“c:\\temp.txt”, “r+”)

Question 5 of 12

Which of the following statements are true regarding the opening modes of a file? (2 correct options)

a) When you open a file for reading, if the file does not exist, an error occurs.
b) When you open a file for writing, if the file does not exist, an error occurs.
c) When you open a file for reading, if the file does not exist, the program will open an empty file.
d) When you open a file for writing, if the file does not exist, a new file is created.

Question 6 of 12

If a file is opened in “r” read mode where does the file pointer point?

a) At the end
b) At the start
c) At the middle
d) None of these

Question 7 of 12

Which of the following is the correct options of compulsory modes when you’re opening a file?

a, b, c, d
w, x, a, r
r, w, x, y

Question 8 of 12

Out of the 4 compulsory modes ( r, w, a, x) , how many can you choose while opening a file?

0
1
2
You can choose all the modes simultaneously

Question 9 of 12

“+” is said to be an optional mode when opening a file. This allows you to read and write to a file. How do you combine “+” with other modes?

It means that the core python developers were not sure whether to include "+" in the language or not.
It means that you can combine all compulsory modes together. Example r+w+a+x.
It means that you may or may not combine "+" with any of the other modes. For example: r+, w+, a+, x+ . It is an extra option that is provided to you.
It is better to avoid the "+" mode. Hence it is optional.

Question 10 of 12

What happens when you combine the + mode with read mode (r+) ?

Your cursor is placed at the beginning of the file. You can read and write to the file. If you start reading your cursor will read from the beginning of the file. If you write your text will start overwriting the existing text.
This is an invalid option.
Your cursor is placed at the end of the file. You can read and write to the file. If you start reading your cursor will read nothing since it's at the end of the file. If you write your text will start from the end of the file.

Question 11 of 12

What happens when you combine the + mode with write mode (w+) ?

Your cursor is placed at the beginning of the file. All existing data is lost (w = overWrite). You can read and write to the file. If you start reading your cursor will read nothing since the contents have been deleted.
This is an invalid mode.
Your cursor is placed at the end of the file. All existing data is retained. You can read and write to the file. If you start reading your cursor will read nothing since the cursor is at the end.

Question 12 of 12

What happens when you combine the + mode with append mode (a+) ?

Your cursor is placed at the end of the file (append). You can read and write to the file. If you start reading your cursor will read nothing since it's at the end. You will first have to use seek(0) or alternatively open the file in "r+" mode. If you write your text will start from the end of the file.
This is an invalid mode.
Your cursor is placed at the beginning of the file (append). You can read and write to the file. If you start reading your cursor will read normally since it's at the beginning. If you write your text will overwrite everything existing.

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7. a) Reading and writing file (Quiz)

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