CBSE COMPUTER SCIENCE

['h', 'g', 'f', 'e', 'd', 'c', 'b'] [] ['h', 'g', 'f', 'e', 'd', 'c', 'b'] ['h', 'g', 'f', 'e', 'd'] ['g', 'f', 'e', 'd'] ['g', 'f', 'e', 'd', 'c'] ['h', 'g', 'f', 'e', 'd', 'c'] >>>

l = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'] print(l[-2:-9:-1]) print(l[-9:-2:-1]) print(l[7:0:-1]) print(l[7:2:-1]) print(l[-3:2:-1]) print(l[-3:-8:-1]) print(l[7:-8:-1])

b="Practice in Python" a=list(b) print(a) print(len(a)) print(a[1:4]) print(a[1:7]) OUTPUT ['P', 'r', 'a', 'c', 't', 'i', 'c', 'e', ' ', 'i', 'n', ' ', 'P', 'y', 't', 'h', 'o', 'n'] 18 ['r', 'a', 'c'] ['r', 'a', 'c', 't', 'i', 'c'] >>>

>>> a="Python" >>> b=list(a) >>> b*2 ['P', 'y', 't', 'h', 'o', 'n', 'P', 'y', 't', 'h', 'o', 'n'] >>> b+b ['P', 'y', 't', 'h', 'o', 'n', 'P', 'y', 't', 'h', 'o', 'n'] >>> a+a 'PythonPython' >>>

for i in range(1,8): print(i) i+=2 OUTPUT 1 2 3 4 5 6 7 >>>

i=2 for x in range(i): i+=1 print(i) print(i) OUTPUT 3 3 4 4 >>>

k="Subscribe to my blog" L=list(k) print(L[-1:-7:-3]) print(L[:15:-1]) print(L[1:len(k):5]) print(L[2:-15]) OUTPUT ['g', 'b'] ['g', 'o', 'l', 'b'] ['u', 'i', 'o', 'b'] ['b', 's', 'c'] >>>

You can watch *Working with Functions XII CS* (Dated 05-04-21) by click on the following link. https://youtu.be/v9Btp3iTI1I

☝️UAE QUESTION SET

Output: 1 : 5 2 : 4 3 : 3 4 : 3 5 : 2

# Python program to count the frequency of # elements in a list using a dictionary def CountFrequency(my_list): # Creating an empty dictionary freq = {} for item in my_list: if (item in freq): freq[item] += 1 else: freq[item] = 1 for key, value in freq.items(): print ("% d : % d"%(key, value)) # Driver function if name == "main": my_list =[1, 1, 1, 5, 5, 3, 1, 3, 3, 1, 4, 4, 4, 2, 2, 2, 2] CountFrequency(my_list)