Latest Python Interview Questions and Answers – Prepare Yourself

1. Best Python Interview Questions

We have already discussed 4 parts of Python Interview Questions. Now, you are welcome to the Latest Python Interview Questions from Data Flair. With this, we bring you 30 more Latest Python Interview Questions with answers to help you hone your Python skills. Both Python freshers and experienced can refer to these latest Python Interview Questions. We have also provided the best links in the answers to give you a deeper understanding of Python.

Let’s revise Python first

So, let’s start exploring the Latest Python Interview Questions.

Latest Python Interview Questions and Answers - 2018

Latest Python Interview Questions and Answers

2. 30 Latest Python Interview Questions

The following set of Latest Python Interview Questions contains basic as well as advanced Python Questions. Read each question carefully, try to answer by yourself, and if you face a problem, we’re happy to help.

Q.1. Is there a way to remove the last object from a list?

Yes, there is. Try running the following piece of code-

>>> list=[1,2,3,4,5
>>> list.pop(-1)

5

Let’s read more about Python List

>>> list

[1, 2, 3, 4]

Q.2. How do you open a file for writing?

Let’s create a text file on our Desktop and call it tabs.txt. To open it to be able to write to it, use the following line of code-

>>> file=open('tabs.txt','w')

This opens the file in writing mode. You should close it once you’re done.

Have a look at Python Read and Write File

>>> file.close()

Q.3. Can you explain the filter(), map(), and reduce() functions?

Let’s see these Python Functions.

  • filter()- This function lets us keep the values that satisfy some conditional logic. Let’s take an example.
>>> set(filter(lambda x:x>4, range(7)))

{5, 6}

This filters in the elements from 0 to 6 that are greater than the number 4.

  • map()- This function applies a function to each element in the iterable.
>>> set(map(lambda x:x**3, range(7)))

{0, 1, 64, 8, 216, 27, 125}

This calculates the cube for each element in the range 0 to 6 and stores them in a set.

  • reduce()- This function reduces a sequence pair-wise, repeatedly until we arrive at a single value.
>>> reduce(lambda x,y:y-x, [1,2,3,4,5])

3

Let’s understand this:

2-1=1

3-1=2

4-2=2

5-2=3

Hence, 3.

Q.4. What do you know about palindromes? Can you implement one in Python?

A palindrome is a phrase, a word, or a sequence that reads the same forward and backward. One such example will be pip! An example of such a phrase will be ‘nurses run’. Let’s implement it, shall we?

>>> def isPalindrome(string):
      left,right=0,len(string)-1
      while right>=left:
              if not string[left]==string[right]:
                       return False
              left+=1;right-=1
              return True
>>> isPalindrome('redrum murder')

True

>>> isPalindrome('CC.')

False

Well, there are other ways to do this too. Let’s try using an iterator.

>>> def isPalindrome(string):
      left,right=iter(string),iter(string[::-1])
      i=0
      while i<len(string)/2:
             if next(left)!=next(right):
                      return False
             i+=1
             return True
>>> isPalindrome('redrum murder')

True

>>> isPalindrome('CC.')

False

>>> isPalindrome('CCC.')

False

>>> isPalindrome('CCC')

True

Q.5. How will you use Python to read a random line from a file?

We can borrow the choice() method from the random module for this.

>>> import random
>>> lines=open('tabs.txt').read().splitlines()
>>> random.choice(lines)

‘https://data-flair.training/blogs/category/python/’

Let’s restart the IDLE and do this again.

>>> import random
>>> lines=open('tabs.txt').read().splitlines()
>>> random.choice(lines)

‘https://data-flair.training/blogs/’

>>> random.choice(lines)

‘https://data-flair.training/blogs/category/python/’

>>> random.choice(lines)

‘https://data-flair.training/blogs/category/python/’

>>> random.choice(lines)

‘https://data-flair.training/blogs/category/python/’

Q.6. How would you define a block in Python?

For any kind of statements, we possibly need to define a block of code under them. However, Python does not support curly braces. This means we must end such statements with colons and then indent the blocks under those with the same amount.

>>> if 3>1:
        print("Hello")
        print("Goodbye")

Hello
Goodbye

Q.7. Why do we need the __init__() function in classes? What else helps?

__init__() is what we need to initialize a class when we initiate it. Let’s take an example.

>>> class orange:
       def __init__(self):
               self.color='orange'
               self.type='citrus'
       def setsize(self,size):
               self.size=size
       def show(self):
             print(f"color: {self.color}, type: {self.type}, size: {self.size}")
>>> o=orange()
>>> o.setsize(7)
>>> o.show()

color: orange, type: citrus, size: 7

In this code, we see that it is necessary to pass the parameter ‘self’ to tell Python it has to work with this object.

Q.8. Explain the output of the following piece of code-

>>> tuple=(123,'John')
>>> tuple*=2
>>> tuple

(123, ‘John’, 123, ‘John’)

In this code, we multiply the tuple by 2. This duplicates its contents, hence, giving us (123, ‘John’, 123, ‘John’). We can also do this to strings:

>>> 'ba'+'na'*2

‘banana’

Q.9. How do you get all values from a Python dictionary?

We saw previously, to get all keys from a dictionary, we make a call to the keys() method. Similarly, for values, we use the method values().

>>> 'd' in {'a':1,'b':2,'c':3,'d':4}.values()

False

>>> 4 in {'a':1,'b':2,'c':3,'d':4}.values()

True

Q.10. How will you convert an integer to a Unicode character?

This is simple. All we need is the chr(x) built-in function. See how.

>>> chr(52)

‘4’

>>> chr(49)

‘1’

>>> chr(67)

‘C’

Latest Python Interview Questions for freshers – Q. 2,3,5,6,9,10

Latest Python Interview Questions for experienced – Q. 1,4,7,8

Q.11. Where will you use while rather than for?

Although we can do with for all that we can do with while, there are some places where a while loop will make things easier-

  • For simple repetitive looping
  • When we don’t need to iterate through a list of items- like database records and characters in a string.

Mostly asked Python Interview Questions
Q.12. In one line, show us how you’ll get the max alphabetical character from a string.

For this, we’ll simply use the max function.

>>> max('flyiNg')

‘y’

The following are the ASCII values for all the letters of this string-

f- 102

l- 108

y- 121

i- 105

N- 78

g- 103

By this logic, try to explain the following line of code-

>>> max('fly{}iNg')

‘}’

(Bonus: } – 125)

Q.13. Why do we need break and continue in Python?

Both break and continue are statements that control flow in Python loops. break stops the current loop from executing further and transfers the control to the next block. continue jumps to the next iteration of the loop without exhausting it.

Q.14. Will the do-while loop work if you don’t end it with a semicolon?

Trick question! Python does not support an intrinsic do-while loop. Secondly, to terminate do-while loops is a necessity for languages like C++.

Q.15. What if you want to toggle case for a Python string?

We have the swapcase() method from the str class to do just that.

>>> 'AyuShi'.swapcase()

‘aYUsHI’

Let’s learn more about Python String

Let’s apply some concepts now, shall we? Questions 16 through 18 assume the string ‘I love Python’. You need to do the needful.

Q.16. Write code to print only upto the letter t.

>>> i=0
>>> while s[i]!='t':
      print(s[i],end=’’)
      i+=1

I love Py

Q.17. Write code to print everything in the string except the spaces.

>>> for i in s:
        if i==' ': continue
        print(i,end='')

IlovePython

Q.18. Now, print this string five times in a row.

>>> for i in range(6):
        print(s)

I love Python

I love Python

I love Python

I love Python

I love Python

I love Python

Okay, moving on to more domains to conquer.

Q.19. Is del the same as remove()? What are they?

del and remove() are methods on lists/ ways to eliminate elements.

>>> list=[3,4,5,6,7]
>>> del list[3]
>>> list

[3, 4, 5, 7]

>>> list.remove(5)
>>> list

[3, 4, 7]

While del lets us delete an element at a certain index, remove() lets us remove an element by its value.

Q.20. What is Python good for?

Python is a jack of many trades, check out Applications of Python to find out more.

Meanwhile, we’ll say we can use it for:

  • Web and Internet Development
  • Desktop GUI
  • Scientific and Numeric Applications
  • Software Development Applications
  • Applications in Education
  • Applications in Business
  • Database Access
  • Network Programming
  • Games, 3D Graphics
  • Other Python Applications

Latest Python Interview Questions for freshers – Q. 11,14,15,17,19,20

Latest Python Interview Questions for experienced – Q. 12,13,16,18

Q.21. Can you name ten built-in functions in Python and explain each in brief?

Ten Built-in Functions, you say? Okay, here you go.

  • complex()- Creates a complex number.
>>> complex(3.5,4)

(3.5+4j)

  • eval()- Parses a string as an expression.
>>> eval('print(max(22,22.0)-min(2,3))')

20

  • filter()- Filters in items for which the condition is true.
>>> list(filter(lambda x:x%2==0,[1,2,0,False]))

[2, 0, False]

  • format()- Lets us format a string.
>>> print("a={0} but b={1}".format(a,b))

a=2 but b=3

  • hash()- Returns the hash value of an object.
>>> hash(3.7)

644245917

  • hex()- Converts an integer to a hexadecimal.
>>> hex(14)

‘0xe’

  • input()- Reads and returns a line of string.
>>> input('Enter a number')

Enter a number7
‘7’

  • len()- Returns the length of an object.
>>> len('Ayushi')

6

  • locals()- Returns a dictionary of the current local symbol table.
>>> locals()

{‘__name__’: ‘__main__’, ‘__doc__’: None, ‘__package__’: None, ‘__loader__’: <class ‘_frozen_importlib.BuiltinImporter’>, ‘__spec__’: None, ‘__annotations__’: {}, ‘__builtins__’: <module ‘builtins’ (built-in)>, ‘a’: 2, ‘b’: 3}

  • open()- Opens a file.
>>> file=open('tabs.txt')

Q.22. What is the purpose of bytes() in Python?

bytes() is a built-in function in Python that returns an immutable bytes object. Let’s take an example.

>>> bytes([2,4,8])

b’\x02\x04\x08′

>>> bytes(5)

b’\x00\x00\x00\x00\x00′

>>> bytes('world','utf-8')

b’world’

Q.23. Explain, in brief, the uses of the modules sqlite3, ctypes, pickle, traceback, and itertools.

  • sqlite3- Helps with handling databases of type SQLite
  • ctypes- Lets create and manipulate C data types in Python
  • pickle- Lets put any data structure to external files
  • traceback- Allows extraction, formatting, and printing of stack traces
  • itertools Supports working with permutations, combinations, and other useful iterables.

Q.24. What is speech_recognition? Does this ship with Python by default?

Speech_recognition is a library for performing the task of recognizing speech with Python. This forms an integral part of AI. No, this does not ship with Python by default. We must download it from the PyPI and install it manually using pip.

Q.25. You mentioned PyPI in your previous answer. Can you elaborate?

Sure. PyPI is the Python Package Index. This is a repository of software for Python. It has a large collection of packages and their binaries for a wide range of uses. Here’s a hint of what it looks like-

Q.26. What will the following code output?
>>> word=’abcdefghij’
>>> word[:3]+word[3:]

The output is ‘abcdefghij’. The first slice gives us ‘abc’, the next gives us ‘defghij’.

Q.27. Optionally, what statements can you put under a try-except block?

We have two of those:

  • else- To run a piece of code when the try-block doesn’t create an exception.
  • finally- To execute some piece of code regardless of whether there is an exception.
>>> try:
       print("Hello")
except:
       print("Sorry")
else:
       print("Oh then")
finally:
       print("Bye")

Hello
Oh then
Bye

Latest Python Interview Questions for freshers – Q. 21,23,24,25

Latest Python Interview Questions for experienced – Q. 22,26,27

Python Interview Questions

3. Python Interview Questions Based on Troubleshooting

Questions 28 through 30 talk about various issues you could run into with Python. This will check how aware you are and what you do to solve problems.

Q.28. If you installed a module with pip but it doesn’t import in your IDLE, what could it possibly be?

  • Well, for one, it could be that I installed two versions of Python on my system- possibly, both 32-bit and 64-bit.
  • The Path variable in my system’s environment variables is probably set to both, but one of them prior to the other- say, the 32-bit.
  • This made the command prompt use the 32-bit version of pip to install the module I chose.
  • When I ran the IDLE, I ran the 64-bit version.

As this sequence of events unlapped, I couldn’t import the module I just installed.

Q.29. Based on your previous answer, how will you solve this issue?

I could do two things.

  • The temporary solution- I will add the path to sys manually every time I work on a new session of the interpreter.
>>> sys.path.append('C:\\Users\\Ayushi\\AppData\\Local\\Programs\\Python\\Python37\\Scripts')
  • The permanent solution- I will update the value of Path in my environment variables to hold the location of the Scripts folder for the 64-bit version first.

Q.30. If while installing a package with pip, you get the error No matching installation found, what can you do?

In such a situation, one thing I can do is to download the binaries for that package from the following location:

https://www.lfd.uci.edu/~gohlke/pythonlibs/

Then, I can install the wheel using pip.

So, this was all in the Latest Python Interview Questions. Hope you like our explanation.

4. Conclusion – Python Interview Questions

So, you have completed the this part of Latest Python Interview Question. Hope these questions helped you to clear all your Python concepts. What is that one question you were asked in your last Python interview and you could not answer? Drop in your experiences in the comments below.

See also –

Python Interview Questions part 3

Python Interview Questions part 2

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