assignments

Introduction-to-Data-Science/Session-5/ShubhamAgrawal/session 5.txt

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+1.
+Opens a file for both appending and reading in binary format. The file pointer is at the
+end of the file if the file exists. The file opens in the append mode. If the file does not
+exist, it creates a new file for reading and writing.
+
+2.
+Every file when read, transfers data to an intermediate buffer before it
+can be accessed by Python, this makes the process faster and reduces the risk of data loss while handling data.
+
+3.
+	t=1/0
+	file1=open(input("Enter name of the file\n"),'r+')
+	file1.seek(0,2)	
+	file1.write(t)
+	except IOError:
+		print("ERROR Enter valid filename")
+	except ZeroDivisionError:
+		print("ERROR can't divide by zero")
+	else:
+		print("everything's fine")
+		file1.close()
+
+4.
+file1=open("to_reverse.txt",'r')
+list1=file1.readlines()
+list1.reverse()
+for item in list1:
+	print(item,end="")
+file1.close()

Introduction-to-Data-Science/Week-3/ShubhamAgrawal/Assignment3.txt

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+1).
+Keys must be unique in a dictionary. If there's a duplicate, the last entry with that key is taken.
+
+2).
+it will show an error as sets don't support indexing.
+
+3).
+tuples are immutable, they can't be edited. Therefore pop() won't work here.
+
+4).
+output:   {'c', 'h', 'o'}
+
+5).
+code:
+def fibonacci(n):
+    n1=1 
+    n2=1
+    print(1)
+    print(1)
+    n3=n1 + n2
+    for _ in range(3,n+1):
+        print(n3)
+        n1=n2
+        n2=n3
+        n3=n1 +n2
+
+n=int(input('enter n : '))
+if(n==1):
+    print(1)
+elif(n==2):
+    print(1)
+    print(1)
+else:
+    fibonacci(n)
+
+6).
+import math       #for sqroot
+n=int(input('enter n : '))
+sqroot = lambda n: math.sqrt(n)
+print(sqroot(n))
+
+7).
+def sortbyvalue(list_1):
+    import operator
+    sorted_list = sorted(list_1.items(), key=operator.itemgetter(1))
+    print(sorted_list)
+
+
+list_1={1:3,7:1,2:4,5:2}
+sortbyvalue(list_1)

Introduction-to-Data-Science/Week-4/Session-5/ShubhamAgrawal/session 5.txt

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+1.
+Opens a file for both appending and reading in binary format. The file pointer is at the
+end of the file if the file exists. The file opens in the append mode. If the file does not
+exist, it creates a new file for reading and writing.
+
+2.
+Every file when read, transfers data to an intermediate buffer before it
+can be accessed by Python, this makes the process faster and reduces the risk of data loss while handling data.
+
+3.
+	t=1/0
+	file1=open(input("Enter name of the file\n"),'r+')
+	file1.seek(0,2)	
+	file1.write(t)
+	except IOError:
+		print("ERROR Enter valid filename")
+	except ZeroDivisionError:
+		print("ERROR can't divide by zero")
+	else:
+		print("everything's fine")
+		file1.close()
+
+4.
+file1=open("to_reverse.txt",'r')
+list1=file1.readlines()
+list1.reverse()
+for item in list1:
+	print(item,end="")
+file1.close()

Introduction-to-Data-Science/Week-4/Session-6/ShubhamAgrawal/session 6.txt

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+1.
+A class is a way to bind the data describing an entity and its associate functions together.
+
+2.
+An instance, in object-oriented programming (OOP), is a specific realization of any object.
+It is an element of a class which inherits its properties.
+
+3.
+An object is an instance of a class where the class represents the definition of some real-world entity.
+A variable of the class type is called an object.
+
+4.
+class CLASSNAME:
+	<statement_1>
+	.
+	.
+	<statement_n>
+
+5.
+A method is a function that takes a class instance as its first parameter.
+Methods are members of classes.
+
+6.
+Use of self helps python differentiate between objects.
+
+7.
+__init__ is a special method in Python classes, it is the constructor method for a class. 
+
+8.
+We dont have to define all the attributes and methods in another class again, thus it prevents 
+redundancy and code duplication
+
+9.
+import random		//for shuffle
+class card():
+    suits={"Hearts":["A","2","3","4","5","6","7","8","9","10","J","Q","K"],
+	"Diamonds":["A","2","3","4","5","6","7","8","9","10","J","Q","K"],
+	"Clubs":["A","2","3","4","5","6","7","8","9","10","J","Q","K"],
+	"Spades":["A","2","3","4","5","6","7","8","9","10","J","Q","K"]}
+
+class deck_of_cards(card):
+	def deal(self,card_suit,card_name):
+		card().suits[card_suit].remove(card_name)
+
+	def shuffle_method(self):
+		if(len(card().suit["Hearts"])+len(card().suit["Diamonds"])+
+			len(card().suit["Clubs"])+len(card().suit["Spades"])==52):
+			print("Deck complete")
+
+		for i in card().suits:
+			random.shuffle(card().suits[i])
+
+10.
+class person():
+	def __init__(self,first, last,phone_no, email):
+		self.firstname = first
+		self.lastname = last
+		self.phonenumber = phone_no
+		self.email = email
+
+class address_book(person):
+	add_book[]
+	def __init__(self,data):
+		self.add_contact(data)
+
+	def add_contact(self,data):
+		self.add_book.append(data)
+
+	def lookup_contact(self,last,first = "NULL"):
+		print("enter last name:")
+		for i in self.add_book:
+			if(first=="NULL"):
+				if(i.last == last):
+					print(i.firstname,i.lastname,i.phonenumber,i.email)
+				else:
+					if(i.firstname==first and i.lastname==last):
+						print(i.firstname,i.lastname,i.phonenumber,i.email)	
+
+
+