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Stacks & Queues in list

Question

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

Solution

Element	Stack Contents
4	4
2	4,2
*	8
22	8, 22
5	8, 22, 5
6	8, 22, 5, 6
+	8, 22, 11
/	8, 2
-	6

Question

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

Solution

Difference b/w r+ and rb+ with respect to Python

r+	rb+
r+ Opens a file for both reading and writing. The file pointer placed at the beginning of the file.	rb+ Opens a file for both reading and writing in binary format. The file pointer placed at the beginning of the file.

Question

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

Solution

Element	Stack
22	22
11	22, 11
/	2
14	2,14
10	2,14,10
-	2,4
+	6
5	6,5
-	1

Question

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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

Solution

f1 = open('BOOK.TXT','r')
f2 = open('BOOK.TXT','w')

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