CBSE Class 12 Computer Science File Handling in Python Assignment

Very Short Answer Type Questions :

Question: What is a data file in python?
Answer: A bunch of bytes / data stores on some storage device referred by the filename.

Question: What is the difference between “w” and “a” modes?
Answer: “w” mode opens file in write mode but “a” mode opens file in append mode.

Question: Differentiate between a text file and a binary file.
Answer: A text file stores data as ASCII/UNICODE characters where as a binary file stores data in binary format (as it is stored in memory). Internal conversion is required in text file and hence slower but binary file does not need any translation and faster.

Question: Differentiate between Absolute path and relative path.
Answer: The absolute paths are from the topmost level of the directory structure. The relative paths are relative to the current working directory denoted as a dot(.) while its parent directory is denoted with two dots(..).

Question: What does stdin, stdout represent?
Answer: stdin represent standard input device and stdout represent standard output device which are represented as files.

Application Based Questions :

Question: Write a python code to find the size of the file in bytes, number of lines and number of words.
Answer: # reading data from a file and find size, lines, words
f=open(‘Lines.txt’,’r’)
str=f.read( )
size=len(str)
print(‘size of file n bytes’,size)
f.seek(0)
L=f.readlines( )
word=L.split( )
print(‘Number of lines ’,len(L))
print(‘Number of words ’,len(word))
f.close( )

Question: Write code to print just the last line of a text file “data.txt”.
Answer: fin=open(“data.txt”,”r”)
lineList=fin.readlines()
print(“Last line = “, lineList[-1])