Python Basic Lists Programs

1)Program to check if the Given List is in Ascending Order or Not

Code:
l1= [1,2,3,5,4,6,7,8,9,10] temp_l1 = l1[:] # To sort the l1 list. l1.sort() if temp_l1==l1: print("List is in Ascending Order") else: print("List is not an Ascending Order")

2)Program to Find Even Numbers From a List

Code:
l1= [1,2,3,5,4,6,7,8,9,10] for i in l1: if i%2==0: print(i,end=" ")

3)Program to Merge Two Lists

Code:
l1=[1,2,3,4,5] l2=[6,7,8,9,10] #To append elements from another list to the current list, use the extend() method l1.extend(l2) print(l1)

4)Interchange First and Last Element of a List

Code:
l1= [1,2,3,5,4,6,7,8,9,10] #Swap List 1st and Last Element l1[0],l1[-1] = l1[-1],l1[0] print(l1)

5)Program to Subtract a List from Another List

Code:
l1= [1,2,3,5,4,6,7,8,9,10] l2= [5,6,7,8,9] l3=[] for i in l1: if i not in l2: l3.append(i) print(l3)

6)Program to Get Data Items From a List Appearing Odd Number of Times

Code:
l1= [1,2,3,5,1,4,6,7,8,9,10,1,4,5,6,7,7,4,7,9,7,4,6] l2=[] for i in l1: if l1.count(i)%2 !=0: if i not in l2: l2.append(i) print(l2)

7) Add a new pair of key (e.g. c ) and value (e.g. 3 ) to the dictionary and print out the new dictionary.

 d = {"a": 1, "b": 2}

Code:

d = {"a": 1, "b": 2}
print("Old Dictionary: ",d)
d["c"]=3
print("New Dictionary: ",d)

Output:

Old Dictionary:  {'a': 1, 'b': 2}
New Dictionary:  {'a': 1, 'b': 2, 'c': 3}

8) Complete the script so that it prints out the letter i using negative indexing.

         letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"]

Code:

letters = ["a", "b", "c", "d", "e", "f", "g", "h", "i","j"]
a = letters[-2]
print("Letter :",a)

Output:

Letter : i

9) Complete the script so that it removes duplicate items from the list a.

 

            a = ["1", 1, "1", 2]

Code:

a = ["1", 1, "1", 2]
a = list(set(a))
print("Updated List:",a)

Output:

Updated List: [1, 2, '1']

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