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NCERT Solution For Class 12 Computer And Communication Technology Computer Science With Python

Data File Handling Here is the CBSE Computer And Communication Technology Chapter 7 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Computer And Communication Technology Data File Handling Chapter 7 NCERT Solutions for Class 12 Computer And Communication Technology Data File Handling Chapter 7 The following is a summary in Hindi and English for the academic year 2021-2022. You can save these solutions to your computer or use the Class 12 Computer And Communication Technology.

Question 1

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Write a method in Python to read lines from a text file DIARY.TXT, and display those lines, which are starting with an alphabet ‘P’.

Solution

def display():
	file=open('DIARY.TXT','r')
	line=file.readline()
	while line:
		if line[0]=='P' :
			print line
			line=file.readline()
	file.close() #IGNORE

Question 2

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Considering the following definition of class COMPANY, write a method in Python to search and display the content in a pickled file COMPANY.DAT, where CompID is matching with the value ‘1005’.

class Company:
	def __init__(self,CID,NAM):
	self.CompID = CID 	#CompID Company ID
	self.CName = NAM 	#CName Company Name
	self.Turnover = 1000
	
	def Display(self):
		print self.CompID,':',self.CName,':',self.Turnover

Solution

import pickle
def ques4c():
	f=Factory()
	file=open('COMPANY.DAT','rb')
	try:
		while True:
			f=pickle.load(file)
			if f.CompID==1005:
				f.Display()
			except EOF Error:
				pass
	file.close() #IGNORE

Question 3

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Observe the following table MEMBER carefully and write the name of the RDBMS operation out of (i) SELECTION (ii) PROJECTION (iii) UNION (iv) CARTESIAN PRODUCT, which has been used to produce the output as shown in RESULT. Also, find the Degree and Cardinality of the RESULT.

NO MNAME STREAM
M001 JAYA SCIENCE
M002 ADIYTA HUMANITIES
M003 HANSRAJ SCIENCE
M004 SHIVAK COMMERCE

RESULT

NO MNAME STREAM
M002 ADIYTA HUMANITIES

Solution

SELECTION
Degree of table RESULT=3
Cardinality of table RESULT = 2

Question 4

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Differentiate between the following:

f = open(‘diary.txt’, ‘r’)

f = open(‘diary.txt’, ‘w’)

Solution

diary.txt is opened for reading data.
diary.txt is opened for writing data.

Question 5

Wired Faculty App

Write a method in python to read the content from a text file diary.txt line by line and display the same on screen.

Solution

def read_file():
	inFile = open('diary.txt', 'r')
	for line in inFile:
		print line

Question 6

Wired Faculty App

Consider the following definition of class Member, write a method in python to write the content in a pickled file member.dat.

class Member:
	def_init_(self,Mno,N) :
	self.Memno=Mno
	self.Name=N
	def Show(self):
		Display (self.Memno, '#',self.Name)
	def store_data(self):
		piFile = open('member.dat','wb')
		pickle.dump(self, piFile)
		piFile.close()

Solution

Output:

Pickel

Computer Science With Python Chapter 7 Data File Handling

NCERT Solution For Class 12 Computer And Communication Technology Computer Science With Python

Write a method in Python to read lines from a text file DIARY.TXT, and display those lines, which are starting with an alphabet ‘P’.

Differentiate between the following:

f = open(‘diary.txt’, ‘r’)

f = open(‘diary.txt’, ‘w’)

Write a method in python to read the content from a text file diary.txt line by line and display the same on screen.

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NO	MNAME	STREAM
M001	JAYA	SCIENCE
M002	ADIYTA	HUMANITIES
M003	HANSRAJ	SCIENCE
M004	SHIVAK	COMMERCE

Computer Science With Python Chapter 7 Data File Handling

NCERT Solution For Class 12 Computer And Communication Technology Computer Science With Python

Write a method in Python to read lines from a text file DIARY.TXT, and display those lines, which are starting with an alphabet ‘P’.

Differentiate between the following: f = open(‘diary.txt’, ‘r’) f = open(‘diary.txt’, ‘w’)

Write a method in python to read the content from a text file diary.txt line by line and display the same on screen.

Mock Test Series

NCERT Book Store

NCERT Sample Papers

Entrance Exams Preparation

Differentiate between the following:

f = open(‘diary.txt’, ‘r’)

f = open(‘diary.txt’, ‘w’)