Se está descargando tu SlideShare. ×

# PRESENTATION ON TUPLES.pptx

Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Anuncio
Próximo SlideShare
Tuples in Python
Cargando en…3
×

1 de 22 Anuncio

# PRESENTATION ON TUPLES.pptx

TUPLES

TUPLES

Anuncio
Anuncio

Anuncio

### PRESENTATION ON TUPLES.pptx

1. 1. PRESENTATION ON TUPLES
2. 2. INTRODUCTION • A tuple is an ordered sequence of elements of different data types, such as integer, float, string, list or even a tuple. Elements of a tuple are enclosed in parenthesis (round brackets) and are separated by commas. Like list and string, elements of a tuple can be accessed using index values, starting from 0. • For example. #tuple1 is the tuple of integers >>> tuple1 = (1,2,3,4,5) >>> tuple1 (1, 2, 3, 4, 5) • If there is only a single element in a tuple then the element should be followed by a comma. If we assign the value without comma it is treated as integer. It should be noted that a sequence without parenthesis is treated as tuple by default
3. 3. ACCESSING ELEMENTS IN A TUPLE • Elements of a tuple can be accessed in the same way as a list or string using indexing and slicing. • >>> tuple1 = (2,4,6,8,10,12) #initializes a tuple tuple1 #returns the first element of tuple1 >>> tuple1[0]
4. 4. IMMUTABILITY • Tuple is an immutable data type. It means that the elements of a tuple cannot be changed after it has been created. An attempt to do this would lead to an error. >>> tuple1 = (1,2,3,4,5) Difference Between Tuple and List • List is mutable but tuple is immutable. So iterating through a tuple is faster as compared to a list. √ If we have data that does not change then storing this data in a tuple will make sure that it is not changed accidentally.
5. 5. OPERATORS IN TUPLE • CONCATENATION: Python allows us to join tuples using concatenation operator depicted by symbol +. We can also create a new tuple which contains the result of this concatenation operation. >>> tuple1 = (1,3,5,7,9) >>> tuple2 = (2,4,6,8,10) >>> tuple1 + tuple2 #concatenates two tuples (1, 3, 5, 7, 9, 2, 4, 6, 8, 10) Concatenation operator can also be used for extending an existing tuple. When we extend a tuple using concatenation a new tuple is created.
6. 6. • REPETITON: Repetition operation is depicted by the symbol *. It is used to repeat elements of a tuple. We can repeat the tuple elements. The repetition operator requires the first operand to be a tuple and the second operand to be an integer only. >>> tuple1 = ('Hello','World’) >>> tuple1 * 3 ('Hello', 'World', 'Hello', 'World', 'Hello', 'World')
7. 7. • SLICING: Like string and list, slicing can be applied to tuples also. #tuple1 is a tuple >>> tuple1 = (10,20,30,40,50,60,70,80) #elements from index 2 to index 6 >>> tuple1[2:7] (30, 40, 50, 60, 70)
8. 8. • FUNCTION: len() Returns the length or the number of elements of the tuple passed as the argument >>> tuple1 = (10,20,30,40,50) >>> len(tuple1) 5 TUPLE() • Creates an empty tuple if no argument is passed • Creates a tuple if a sequence is passed as argument >>> tuple1 = tuple() >>> tuple1 ( ) >>> tuple1 = tuple('aeiou’)#string >>> tuple1 ('a', 'e', 'i', 'o', 'u’) >>> tuple2 = tuple([1,2,3]) #list >>> tuple2 (1, 2, 3) >>> tuple3 = tuple(range(5)) >>> tuple3
9. 9. CONTD. (0, 1, 2, 3, 4) count() Returns the number of times the given element appears in the tuple >>> tuple1 = (10,20,30,10,40,10,50) >>> tuple1.count(10) 3 >>> tuple1.count(90) 0 INDEX() • Returns the index of the first occurrence of the element in the given tuple >>> tuple1 = (10,20,30,40,50) >>> tuple1.index(30) 2 >>> tuple1.index(90)
10. 10. • ValueError: tuple.index(x): x not in tuple SORTED() • Takes elements in the tuple and returns a new sorted list. It should be noted that, sorted() does not make any change to the original tuple >>> tuple1 = ("Rama","Heena","Raj", "Mohsin","Aditya") >>> sorted(tuple1) ['Aditya', 'Heena', 'Mohsin', 'Raj', 'Rama’] • min()Returns minimum or smallest element of the tuple • max() Returns maximum or largest element Of the tuple • sum() Returns sum of the elements of the tuple >>> tuple1 = (19,12,56,18,9,87,34) >>> min(tuple1) 9 >>> max(tuple1) 87 >>> sum(tuple1)
11. 11. NESTED TUPLES A tuple inside another tuple is called a nested tuple. >>>t1 = ((“Amit”, 90), (“Sumit”, 75), (“Ravi”, 80)) >>>t1[0] (‘Amit’, 90) >>>t1[1] (‘Sumit’, 75) >>>t1[1][1] 75
12. 12. TUPLE ASSIGNMENT It allows a tuple of variables on the left side of the assignment operator to be assigned respective values from a tuple on the right side. The number of variables on the left should be same as the number of elements in the tuple. For Example >>>(n1,n2) = (5,9) >>>print(n1) 5 print(n2) 9 >>>(a,b,c,d) = (5,6,8) #values on left side and right side are not equal ValueError: not enough values to unpack
13. 13. QNA Q1.Write a program that interactively create a nested tuple to store the marks in three subjects for five student . Ans. total = () for i in range(3): mark = () mark1 = int(input("enter the marks of first subject = ")) mark2 = int(input("enter the marks of second subject = ")) mark3 = int(input("enter the marks of third subject = ")) mark = (mark1 , mark2 , mark3) total= total + (mark) print("total marks = ",total)
14. 14. Q2.Write a program to create a nested tuple to store roll number, name and marks of student Ans. tup= () while True : roll = int(input("Enter a roll number :- ")) name = input("Enter name :-") mark = input("Enter marks :-") tup += ( (roll,name,mark ),) user = input("Do you want to quit enter yes =") if user == "yes": print(tup) break
15. 15. Q3.Consider the following tuples, tuple1 and tuple2: tuple1 = (23,1,45,67,45,9,55,45) tuple2 = (100,200) Find the output of the following statements: 1.print(tuple1.index(45)) Ans. The 'index()' function returns the index of the first occurrence of the element in a tuple. 2 2.print(tuple1.count(45)) Ans. The 'count()' function returns the numbers of times the given element appears in the tuple. 3 3.print(tuple1 + tuple2) Ans. '+' operator concatenate the two tuples. (23, 1, 45, 67, 45, 9, 55, 45, 100, 200) 4.print(len(tuple2)) Ans. The 'len()' function returns the number of elements in the given tuple. 2 5.print(max(tuple1)) Ans. The 'max()' function returns the largest element of the tuple. 67
16. 16. 6.print(min(tuple1)) Ans. The 'min()' function returns the smallest element of the tuple. 1 7.print(sum(tuple2)) Ans. The 'sum()' function returns the sum of all the elements of the tuple. 300 8.print(sorted (tuple1)) print(tuple1) Ans. The 'sorted()' function takes element in the tuple and return a new sorted list. It doesn’t make any changes to the original tuple. Hence, print(tuple1) will print the original tuple1 i.e. (23, 1, 45, 67, 45, 9, 55, 45) . [1, 9, 23, 45, 45, 45, 55, 67] (23, 1, 45, 67, 45, 9, 55, 45)
17. 17. Q4.Carefully read the given code fragments and figure out the errors that the code may produce. • (a) t = ('a', 'b', 'c', 'd', 'e’) print(t[5]) Ans. IndexError: tuple index out of range • (b) t = ('a', 'b', 'c', 'd', 'e’) t[0] = ‘A’ Ans. TypeError: 'tuple' object does not support item assignment
18. 18. • (c) t1 = (3) t2 = (4, 5, 6) t3 = t1 + t2 print(t3) Ans. TypeError: unsupported operand type(s) for +: 'int' and 'tuple’ • (d) t2 = (4, 5, 6) t3 = (6, 7) print(t3 - t2) Ans. TypeError: unsupported operand type(s) for -: 'tuple' and 'tuple'
19. 19. • (e) t3 = (6, 7) t4 = t3 * 3 t5 = t3 * (3) t6 = t3 * (3,) print(t4) print(t5) print(16) Ans. TypeError: can't multiply sequence by non-int of type 'tuple’ • (f) t = ('a', 'b', 'c', 'd', 'e’) 1, 2, 3, 4, 5, = t Ans. Syntax error
20. 20. • (g) 2t = ('a', 'b', 'c, d', 'e’) 1n, 2n, 3n, 4n, 5n = t Ans. Invalid syntax • (h) t = ('a', 'b', 'c', 'd', 'e’) x, y, z, a, b = t Ans. No Error • (i) t = ('a', 'b', 'c', 'd', 'e’) a, b, c, d, e, f = t Ans. ValueError : not enough values to unpack (expected 6, got 5)
21. 21. Q5. What does each of the following expressions evaluate to? Suppose that T is the tuple ("These", ("are", "a", "few", "words"), "that", "we", "will", "use") • (a) T[1][0: : 2] Ans. ('are', 'few') • (b) "a" in T [1] [ 0 ] Ans. True • (c) T [ : 1 ] + T[ 1 ] Ans. ('These', 'are', 'a', 'few', 'words') • (d) T[ 2 : : 2 ] Ans. ('that', 'will')
22. 22. • (e) T[2][2] in T[1] Ans. True THANK YOU