Lab4

readme.txt

+Group No. 30 - "Prayas"
+(Neeraj Dhake, 150050022) (Utsav Anand, 150050044) (Mukesh Pareek, 150050049)
+
+Honour Code:
+Neeraj: We pledge on our honour that we have not given or received any unauthorized assistance on this assignment.
+Utsav: We pledge on our honour that we have not given or received any unauthorized assistance on this assignment.
+Mukesh: We pledge on our honour that we have not given or received any unauthorized assistance on this assignment.
+
+Citations:
+http://try.github.io
+
+Percentage contribution:
+Neeraj 100%
+Utsav  100%
+Mukesh 100%
+
+Extra Credit:
+	E1. The error reads "AttributeError: 'tuple' object has no attribute 'append'"
+	    This tells us that the object tuple has no method append. In other words, append works only on the list and not on a tuple.To append an element you'll either have to convert the tuple to  a list, append the list and then reconvert the list to tuple or create a 1-tuple of the element to be appended and add them using '+' operator. 
+
+    E2.	Observation:
+    	If we append an element to a list which is a member of a tuple, it is successful in doing so.
+    	Explanation:
+    	This happens because-
+    	Say the list is stored as i-th element of a n-tuple A, then the command used is A[i].append(element_to_be_appended).
+    	A[i] is a list so append works normally as one would expect to work on a normal list. And since append() is a method of list and not of a tuple, this works perfectly fine. Also, this does not contradict the previous observation.
\ No newline at end of file

task1.py

+#!/usr/bin/python
+def function1(string1,string2,listVariable):
+	newList=zip(string1,string2)
+	result=listVariable+newList
+	return result
+	
+initialList= ["Muk","Nee","Uts","Par","Dha"]
+resultList=function1("CS251","Software",initialList)
+print initialList
+print resultList
+

task2.py

+#!/usr/bin/python
+def function2(listVariable,n):
+	resultList=map(lambda x: x[n],listVariable)
+	print resultList											#printing the n-th element of each tuple as a list
+	sortedList=sorted(listVariable, key=lambda x: x[n])			
+	return sortedList											#returning the list sorted according to n-th element of each tuple
+
+

task3.py

+#!/usr/bin/python
+def function3():	
+	opened_file=open("matrix.txt","r")
+
+	for i,line in enumerate(opened_file):
+		if(i == 0):
+			var="".join(line)
+			new_var=var.split()
+			w = int(new_var[0])
+			h = int(new_var[1])
+			matrix = [[None for x in range(h)] for y in range(w)]      #initialising a 2-D array of given dimensions of None.
+		elif(i != 0):
+			var="".join(line)
+			matrix[i-1]=var.split()										#storing data as 2-D array
+		if(i == w): 													#accounts for extra blank lines at the end of matrix.txt                                               	
+			break
+	opened_file.close()
+	Matrix1 = [[0 for x in range(w)] for y in range(h)]
+	
+	for i in range(w):
+		for j in range(h):
+			Matrix1[j][i]=matrix[i][j]									#calculating the transpose
+
+	transpose = open("transpose.txt","r+")
+	transpose.write(str(h) + " " + str(w) +"\n")
+
+	for k in range(h):
+		result=" ".join((Matrix1[k]))
+		transpose.write(result + "\n")
+
+	transpose.close()
+
+function3()

transpose.txt

+5 5
+1 6 11 16 21
+2 7 12 17 22
+3 8 13 18 23
+4 9 14 19 24
+5 10 15 20 25