File Handling in Python -Revision test

A text file story.txt contains 500 lines. Which method is MOST memory-efficient for counting the number of lines?

• len(f.readlines())

• f.read().count("\n")

• Iterating with for line in f and counting

• f.readline() repeatedly storing in a list

A text file contains: Hello Python 123 Code What will f.read().split() return?

• ['Hello', 'Python', '123', 'Code']

• ['Hello Python', '123 Code']

• ['Hello Python\n123 Code']

• ['Hello', 'Python\n123', 'Code']

Which statement is TRUE about file reading in Python?

• read() reads line by line

• readline() reads the whole file

• readlines() reads entire file into a list

• read() returns list of strings

If a text file pointer is at the end after reading, which function resets it to the beginning?

• f.restart()

• f.flush()

• f.seek(0)

• f.reset()

Consider: f=open("data.txt","r") print(f.readline(4)) If file contains "Python", output will be:

• "Python"

• "Pyth"

• "Py"

• Error

To count the number of words in a text file, the best approach is:

• Count spaces

• Use .split() on each line

• Use .count(" ")

• Count characters

A file is opened in "r+" mode. Which is TRUE?

• Can read but not write

• Can write but not read

• Can read and write both

• Only creates a new file

File data.txt contains "Hello". f=open("data.txt","w") f.write("World") f.close() What will be the content of file?

• HelloWorld

• WorldHello

• World

• Error

Which file mode ensures new data is always added at end without overwriting?

• "w"

• "a"

• "r+"

• "w+"

Which function is best to check if a file exists before opening?

• os.path.exists()

• f.check()

• f.isFile()

• file.exists()