Python List

  

Python

Sequence - List

Fill in the blanks

1.List is Mutable

2.Tuble is Immutable

3.List index starts with 0

4.List Bracket  []  square bracket

5.Tuple bracket ()

6. list = ["hai" , [4,3,96],['p','y','t',’h’,'o','n']] .list[2][2]   =  t

7.a=[‘h’,’a’,’p’,’p’,’y’].  a[-3]=   p

8.b=[‘w’,’e’,’l’,’c’,’o’,’m’,’e’]. b[-4:6]=   com

9.print([‘python’]*3)=  [‘python’,’python’,’python’]

10.x=[‘p’,’r’,’o’,’b’,’l’,’e’,’m’].del x[1:5]  =  [‘p’,’e’,’m’]

11.y=[‘w’,’e’,’l’,’c’,’o’,’m’,’e’].print(y.pop()) =e

12. a=[5,1,9,4,3].print(a.sort())= [1,3,4,5,9]

13.z=[3,1,9,5,9,2].print(z.count(9))= 2

14.b=[5,7,3].print(b.append(2))= [5,7,3,2]

15. a=[2,1,3,8].print(b.len())= 4

16.  a=[2,1,3,8].print(b.max())= 8

17.  a=[2,1,3,8].print(b.min())= 1

18. a=[2,1,3,8].print(b.sum())= 14

19. n = [2,4,6,8]. n[0]=1.print(n)=  [1,4,6,8]

20.a=[3,7,8].b=[1,4,9].print(a+b) = [3,7,8,1,4,9]

 

Answer the following Question

                                                          (4 marks)

            1.Write a list built-in function.

#empty list 'a'

>>>a=[]

#all() function return true if all elements are true or list is empty

>>>all(a)

True

>>>a.append(3)

>>>a.appened(4)

>>>a

[3,4]

>>>all(a)

True

>>>a.append(0)

#return false because one zero element added

>>>all(a)

false

#any() return true if any element of a list is true

#if list is empty return false

>>>a

[3,4,0]

>>>any(a)

True

>>>b=[]

>>any(b)

False

#example len() to count no of element in the list

>>>len(a)

3

>>>max(a)

4

>>>min(a)

0

#sorted return a new sorted list(does not sort the list itself)

>>>sorted (a)

[0,3,4]

#list remain unchanged

>>>d.sorted(a)

>>>d

[0,3,4]

>>>sum(a)

7

          2.Write a list Methods.

list1=[34,56,12,56,78,0,6,7,12]

print(list1.index(12))

print(list1.count(12))

list1.sort()

print(list1)

list1.reverse()

print(list1)

OUTPUT

2

2

[0,6,7,12,12,34,56,56,78]

[78,56,56,34,12,12,7,6,0]

          3.Write a list change or add element and delete or remove element in List.

HOW TO CHANGE OR ADD ELEMENTS TO A LIST ?

num = [2,4,6,8]

#change the 1st item

num[0]=1

print(num)

 #output:  [1,4,6,8]

#change 2nd to 4th items

num[1:4] = [3,5,7]

print(num)

 #Output:  [1,3,5,7]

HOW TO DELETE OR REMOVE ELEMENTS FROM A LIST :

we can delete one or more items using del keyword.

list1=['p','r','o','b','l','e','m']

del list1[2]

print(list1)

 Output :   ['p','r','b','l','e','m']

del list1[1:5]

print(list1)

 Output: ['p','m']

print(list1)

 

output

['p','r','b','l','e','m']

['p','m']

traceback (most recent call last):

file"c:/python33/ss.py",line 17 , in<module>

print(list 1)

 

list1 = ['p','r','o','b','l','e','m']

list1.remove('p')

print(list1)

print(list1.pop(1))

print(list1)

print(list1.pop())

print(list1)

list1.clear()

print(list1)

 

 

output

['r','o','b','l','e','m']

o

['r','b','l','e','m']

m

['r','b','l','e']

[]

 

>>>list1 = ['p','r','o','b','l','e','m']

>>>list1[2:3] =[]

>>>list1

['p','r','b','l','e','m']

>>>list1[2:5]=[]

>>>list1

['p','r','m']