Which of the following commands can be used to read the entire content of a file as a string using the file object tmp file?

This set of Python Multiple Choice Questions & Answers [MCQs] focuses on “files”.

1. To open a file c:\scores.txt for reading, we use _____________
a] infile = open[“c:\scores.txt”, “r”]
b] infile = open[“c:\\scores.txt”, “r”]
c] infile = open[file = “c:\scores.txt”, “r”]
d] infile = open[file = “c:\\scores.txt”, “r”]
View Answer

Answer: b
Explanation: Execute help[open] to get more details.

2. To open a file c:\scores.txt for writing, we use ____________
a] outfile = open[“c:\scores.txt”, “w”]
b] outfile = open[“c:\\scores.txt”, “w”]
c] outfile = open[file = “c:\scores.txt”, “w”]
d] outfile = open[file = “c:\\scores.txt”, “w”]
View Answer

Answer: b
Explanation: w is used to indicate that file is to be written to.

3. To open a file c:\scores.txt for appending data, we use ____________
a] outfile = open[“c:\\scores.txt”, “a”]
b] outfile = open[“c:\\scores.txt”, “rw”]
c] outfile = open[file = “c:\scores.txt”, “w”]
d] outfile = open[file = “c:\\scores.txt”, “w”]
View Answer

Answer: a
Explanation: a is used to indicate that data is to be appended.

4. Which of the following statements are true?
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, a new file is created
c] When you open a file for writing, if the file exists, the existing file is overwritten with the new file
d] All of the mentioned
View Answer

Answer: d
Explanation: The program will throw an error.

5. To read two characters from a file object infile, we use ____________
a] infile.read[2]
b] infile.read[]
c] infile.readline[]
d] infile.readlines[]
View Answer

Answer: a
Explanation: Execute in the shell to verify.

6. To read the entire remaining contents of the file as a string from a file object infile, we use ____________
a] infile.read[2]
b] infile.read[]
c] infile.readline[]
d] infile.readlines[]
View Answer

Answer: b
Explanation: read function is used to read all the lines in a file.

7. What will be the output of the following Python code?

1. f = None
2. for i in range [5]:
3. with open["data.txt", "w"] as f:
4. if i > 2:
5. break
6. print[f.closed]

a] True
b] False
c] None
d] Error
View Answer

Answer: a
Explanation: The WITH statement when used with open file guarantees that the file object is closed when the with block exits.

8. To read the next line of the file from a file object infile, we use ____________
a] infile.read[2]
b] infile.read[]
c] infile.readline[]
d] infile.readlines[]
View Answer

Answer: c
Explanation: Execute in the shell to verify.

9. To read the remaining lines of the file from a file object infile, we use ____________
a] infile.read[2]
b] infile.read[]
c] infile.readline[]
d] infile.readlines[]
View Answer

Answer: d
Explanation: Execute in the shell to verify.

10. The readlines[] method returns ____________
a] str
b] a list of lines
c] a list of single characters
d] a list of integers
View Answer

Answer: b
Explanation: Every line is stored in a list and returned.

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