NCERT Solutions for Class 12 Computer And Communication Technology Computer Science With Python Chapter 6 Stacks & Queues In List

Evaluate the following Postfix notation of expression:
4,2,*,22,5,6,+,/,-

Differentiate between file modes r+ and rb+ with respect to Python.

Evaluate the following postfix notation of expression. Show status of the stack after every operation.
22,11,/,14,10,,+,5,2

Write a statement in Python to perform the following operations:

• To open a text file “BOOK.TXT” in read mode
• To open a text file “BOOK.TXT” in write mode

Write a method in python to write multiple line of text contents into a text file myfile.txt line.

Consider the following definition of class Staff, write a method in python to search and display the content in a pickled file staff.dat, where Staff code is matching with ‘S0105’.

class Staff:

	def __init__(self,S,SNM):
		self.Staffcode=S
		self.Name=SNM
	def Show(self):
		print(self.Staffcode,' ',
			self.Name)

Write PUSH (Books) and POP (Books) methods in python to add Books and remove Books considering them to act as Push and Pop operations of Stack.

Write a method in python to find and display the prime numbers between 2 to N. Pass N as an argument to the method.

Evaluate the following postfix notation of expression. Show status of the stack after every operation.
84, 62, –, 14, 3, *, +