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## Python Interview Questions 16-20

Let’s start with the 4th set of Python Interview Questions. Mostly, the product-based companies in India ask these questions in the first round of interviews for Business Intelligence Engineer/Data Analyst/Business Analyst/Data Scientist

Python Interview Questions

16. Interchange first and last element in a list

`l = [1,2,3,5,6]temp = l[0]l[0] = l[len(l)-1]l[len(l)-1] = tempprint(l)or l = [4,5,6,7,8]print("List",l)def inter(l):l[0],l[-1] = l[-1],l[0]return l`

print(“Interchanged List” , inter(l))

17. Swap two positions in a list

`p1 = 2p2 = 5l = [1,2,3,4,5,6,7]print("Original List",l)def swap(l,p1,p2):l[p1],l[p2] = l[p2],l[p1]return lprint("Swaped list", swap(l,p1,p2))`

18. To check if a particular element is there in the list

`l = ['a','b','d']count = l.count('d')print(count)or l_set = set(l)if 'b' in l_set:print("Mil gaya")or Use a naive method of loopfor i in range(0,len(l)):if l[i] == 'd':print("Mil gaya at",i)`

19. Get the sum of elements in a list

`l = [1,3,5,6]s = 0for i in range(0,len(l)):s = s+l[i]print(s)or list1 = [9,8,7,6]def sumOfList(list, size):if (size == 0):return 0else:return list[size - 1] + sumOfList(list, size - 1)total = sumOfList(list1, len(list1))print("Sum of all elements in given list: ", total)`

20. Multiple all the numbers in a list

`l = [1,3,5,6]m = 1for i in range(0,len(l)):s = s*l[i]print(s)`

## The Data Monk Interview Books â€“ Donâ€™t Miss

Now we are also available on our website where you can directly download the PDF of the topic you are interested in. At Amazon, each book costs ~299, on our website we have put it at a 60-80% discount. There are ~4000 solved interview questions prepared for you.

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12 E-books for 12 Machine Learning algorithms with 1000+ interview questions â€“ For those candidates who want to include any Machine Learning Algorithm in their resume and to learn/revise the important concepts. These 12 e-books are a part of the 23 e-book package

Individual 50+ e-books on separate topics

## Important Resources to crack interviews (Mostly Free)

There are a few things which might be very useful for your preparation

The Data Monk Youtube channel â€“ Here you will get only those videos that are asked in interviews for Data Analysts, Data Scientists, Machine Learning Engineers, Business Intelligence Engineers, Analytics Manager, etc.
Go through the watchlist which makes you uncomfortable:-

All the list of 200 videos
Complete Python Playlist for Data Science
Company-wise Data Science Interview Questions â€“ Must Watch
All important Machine Learning Algorithm with code in Python
Complete Python Numpy Playlist
Complete Python Pandas Playlist
SQL Complete Playlist
Case Study and Guesstimates Complete Playlist
Complete Playlist of Statistics