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Top 100 Python Interview Questions And Answers

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The document contains a series of interview questions and responses about Python, covering its features, fundamental concepts, and differences compared to other programming languages like Java. Key topics include Python's interpreted nature, its high-level programming characteristics, debugging tools, and built-in functions like pickling and unpickling. It also discusses programming paradigms, memory management, the importance of PEP 8 for code formatting, and specific functionalities such as decorators and unittest.

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P Y T H O N I N T E R V I E W Q U E S T I O N S W W W . P R O B Y T E S . N E T
1. What is Python? P y t h o n i s a g e n e r a l - p u r p o s e p r o g r a m m i n g l a n g u a g e w h i c h i s o b j e c t - o r i e n t e d a n d h i g h - l e v e l p r o g r a m m i n g m a i n l y u s e d f o r w e b a p p l i c a t i o n s a n d d e v e l o p m e n t .
2. What are the features Python can offer?  P y t h o n c a n b e u s e d t o c r e a t e s o f t w a r e , g a m e s a n d w e b a p p l i c a t i o n u s i n g s e v e r a l f r a m e w o r k s .
3. Can you compare Java and Python?  Y e s , t h e b i g g e s t d i f f e r e n c e b e t w e e n J a v a a n d P y t h o n , P y t h o n i s e a s i e r a n d s i m p l e r w h e r e a s J a v a u s e s m o r e c o m p l e x c o d e s .
4. Is Python an interpreted language?  Y e s , P y t h o n h a s i n t e r p r e t e d l a n g u a g e b e c a u s e P y t h o n p r o g r a m s r u n d i r e c t l y f r o m t h e s o u r c e c o d e .
5. Who was the founder of Python and when was it released?  G u i d o V a n R o s s u m h a s f o u n d e d t h e P y t h o n a n d i t w a s r e l e a s e d i n D e c e m b e r 1 9 8 9 .
6. Name any programming paradigms which Python include?  O b j e c t - o r i e n t e d , i m p e r a t i v e , f u n c t i o n a l a n d p r o c e d u r a l a r e t h e p r o g r a m m i n g p a r a d i g m s w h i c h P y t h o n i n c l u d e .
7. Why is Python said to be a High-Level Programming Language?  P y t h o n i s s a i d t o b e H i g h - L e v e l P r o g r a m m i n g l a n g u a g e b e c a u s e t h e l a n g u a g e w h i c h P y t h o n u s e s i s c l o s e r t o h u m a n l a n g u a g e s t h u s w h i c h m a k e s i t e a s i e r f o r a h u m a n t o i n t e r p r e t .
8. What do you know about PEP 8? Why is it important?  P E P 8 i s P y t h o n ’ s s t y l e g u i d e w h i c h h a s s e t o f r u l e s f o r h o w t o f o r m a t y o u r P y t h o n c o d e . I t i s i m p o r t a n t b e c a u s e i t s h o w s h o w t h e P y t h o n c o d e s h o u l d b e f o r m a t t e d .
9. Can you differentiate between pickling and Un- pickling in Python?  P i c k l i n g i n P y t h o n i s t h e p r o c e s s o f c o n v e r t i n g P y t h o n o b j e c t t o b y t e s t r e a m w h e r e a s u n p i c k i n g i s t h e r e v e r s e o p e r a t i o n o f t h e p i c k l i n g .
10. How will you find the bugs and errors in a Python code?  T o f i n d t h e b u g s a n d e r r o r s i n P y t h o n c o d e w e ’ l l u s e P y t h o n D e b u g g e r t o o l o r P D B .
11. Can you state the names of the tool which are used to find bugs in Python? P y C h e c k e r i s u s e d t o f i n d b u g s i n P y t h o n . P y l i n t i s a n o t h e r t o o l w h i c h c a n b e u s e d t o d e t e c t e r r o r s .
12. How can you alter functions in Python syntax?  B y u s i n g P y t h o n d e c o r a t o r s w e c a n a l t e r t h e f u n c t i o n s e a s i l y .
13. What is the use of dictionaries in Python?  D i c t i o n a r i e s i n P y t h o n a r e u s e d f o r m a p p i n g o f u n i q u e k e y s t o v a l u e s .
14. What are the major two versions of Python Programming language? P y t h o n 2 . 0 a n d P y t h o n 3 . 0 a r e t h e t w o v e r s i o n s u s e d P y t h o n p r o g r a m m i n g l a n g u a g e .
15. What is “The Zen of Python”?  I t i s t h e p r i n c i p l e w h i c h i n f l u e n c e s t h e d e s i g n o f t h e p y t h o n p r o g r a m m i n g .
16. Which command do you use to exit the help window in Python programming?  T o e x i t t h e h e l p w i n d o w i n P y t h o n p r o g r a m m i n g ‘ p r e s s q ’ .
17. How would you list all the built-in functions and variables in Python?  B y u s i n g h e l p ( ) f u n c t i o n o r d i r ( ) f u n c t i o n w e c a n l i s t a l l t h e b u i l t - i n f u n c t i o n s t h a t a r e a v a i l a b l e i n t h e P y t h o n .
18. Explain module in Python?  T h e M o d u l e i s u s e d t o s t r u c t u r e a P y t h o n p r o g r a m . M o d u l e s b a s i c a l l y c o n t a i n a s e t o f f u n c t i o n s w h i c h y o u w a n t t o u s e i n a P y t h o n p r o g r a m .
19. How will you find methods or attributes of an object?  W e c a n f i n d m e t h o d s o r a t t r i b u t e s o f a n o b j e c t b y u s i n g b u i l t - i n f u n c t i o n s . H e l p ( ) o r d i r ( ) c a n b e u s e d t o f i n d t h e a t t r i b u t e s o f a n o b j e c t .
20. What do you know about mutable and immutable types in Python? They are the built-in  T y p e s o f P y t h o n . M u t a b l e b u i l t - i n t y p e s a r e l i s t , s e t s , a n d d i c t i o n a r i e s . I m m u t a b l e b u i l t - i n t y p e s a r e s t r i n g s , t u p l e s , a n d n u m b e r s .
21. Why isn’t memory freed whenever the Python exits?  M e m o r y i s n ’ t f r e e d b e c a u s e P y t h o n d o e s n o t t r y t o d e s t r o y e v e r y s i n g l e o f i t s o b j e c t . A l s o , c e r t a i n b i t s o f m e m o r y a r e d i s t r i b u t e d b y t h e C l i b r a r y w h i c h i s i m p o s s i b l e t o g e t f r e e .
22. Can you explain the term monkey patching in Python?  M o n k e y P a t c h i n g i s a m e t h o d b y w h i c h w e c a n e x t e n d o u r p r o g r a m m i n g w h i l e r u n t i m e . W e c a n m o d i f y t h e c o d e o r e x t e n d s i t w h i l e r u n t i m e .
23. What does “*args” and “**kwargs” means and why do have to use it? * a r g s a n d * * k w a r g s a r e t h e s p e c i a l s y n t a x u s e d f o r t h e f u n c t i o n t o p a s s a v a r i a b l e n u m b e r o f a r g u m e n t s t o a f u n c t i o n i n a P y t h o n .
24. How will you modify the strings in Python? Can you name all of them?  W e c a n u s e d i f f e r e n t f u n c t i o n s w h i c h c a n b e u s e d t o m o d i f y t h e s t r i n g s . S p l i t ( ) , s u b ( ) , a n d s u b n ( ) a r e t h e f u n c t i o n s u s e d t o m o d i f y t h e s t r i n g s i n P y t h o n .
25. Can u state the difference between range and xrange in Python? State their uses.  B o t h a r e u s e d t o g e n e r a t e a l i s t o f n u m b e r f o r t h e u s e r t o u s e . T h u s o n l y d i f f e r e n c e i s t h a t x r a n g e o n l y r e t u r n s t h e x r a n g e o b j e c t w h e r e a s r a n g e r e t u r n s t h e P y t h o n l i s t o f o b j e c t .
26. Explain the term unittest. What is the use of unittest in Python?  U n i t t e s t i n P y t h o n p r o v i d e s a u n i t t e s t i n g f r a m e w o r k . I t h e l p s i n a u t o m a t i o n t e s t i n g , s h u t d o w n c o d e f o r t e s t s , a g g r e g a t i o n o f t e s t s a n d i n d e p e n d e n c e t e s t s .
27. Can you convert a string to a number and how?  Y e s , w e c a n c o n v e r t a s t r i n g t o a n u m b e r b y u s i n g b u i l t - i n f u n c t i o n s i n P y t h o n . F o r e x a m p l e , c h = “ 4 7 8 9 ” i s a s t r i n g w h i c h c a n b e c o n v e r t e d t o a n i n t e g e r b y u s i n g n u m = i n t ( c h )
28. Can you copy an object in Python and how?  Y o u c a n n o t c o p y m o s t o f t h e o b j e c t s b u t s t i l l b y u s i n g c o p y . c o p y ( ) o r c o p y . d e e p c o p y ( ) w e c a n c o p y a n o b j e c t i n P y t h o n .
29. Can you copy an object in Python and how?  Y o u c a n n o t c o p y m o s t o f t h e o b j e c t s b u t s t i l l b y u s i n g c o p y . c o p y ( ) o r c o p y . d e e p c o p y ( ) w e c a n c o p y a n o b j e c t i n P y t h o n .

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Top 100 Python Interview Questions And Answers

  • 1. P Y T H O N I N T E R V I E W Q U E S T I O N S W W W . P R O B Y T E S . N E T
  • 2. 1. What is Python? P y t h o n i s a g e n e r a l - p u r p o s e p r o g r a m m i n g l a n g u a g e w h i c h i s o b j e c t - o r i e n t e d a n d h i g h - l e v e l p r o g r a m m i n g m a i n l y u s e d f o r w e b a p p l i c a t i o n s a n d d e v e l o p m e n t .
  • 3. 2. What are the features Python can offer?  P y t h o n c a n b e u s e d t o c r e a t e s o f t w a r e , g a m e s a n d w e b a p p l i c a t i o n u s i n g s e v e r a l f r a m e w o r k s .
  • 4. 3. Can you compare Java and Python?  Y e s , t h e b i g g e s t d i f f e r e n c e b e t w e e n J a v a a n d P y t h o n , P y t h o n i s e a s i e r a n d s i m p l e r w h e r e a s J a v a u s e s m o r e c o m p l e x c o d e s .
  • 5. 4. Is Python an interpreted language?  Y e s , P y t h o n h a s i n t e r p r e t e d l a n g u a g e b e c a u s e P y t h o n p r o g r a m s r u n d i r e c t l y f r o m t h e s o u r c e c o d e .
  • 6. 5. Who was the founder of Python and when was it released?  G u i d o V a n R o s s u m h a s f o u n d e d t h e P y t h o n a n d i t w a s r e l e a s e d i n D e c e m b e r 1 9 8 9 .
  • 7. 6. Name any programming paradigms which Python include?  O b j e c t - o r i e n t e d , i m p e r a t i v e , f u n c t i o n a l a n d p r o c e d u r a l a r e t h e p r o g r a m m i n g p a r a d i g m s w h i c h P y t h o n i n c l u d e .
  • 8. 7. Why is Python said to be a High-Level Programming Language?  P y t h o n i s s a i d t o b e H i g h - L e v e l P r o g r a m m i n g l a n g u a g e b e c a u s e t h e l a n g u a g e w h i c h P y t h o n u s e s i s c l o s e r t o h u m a n l a n g u a g e s t h u s w h i c h m a k e s i t e a s i e r f o r a h u m a n t o i n t e r p r e t .
  • 9. 8. What do you know about PEP 8? Why is it important?  P E P 8 i s P y t h o n ’ s s t y l e g u i d e w h i c h h a s s e t o f r u l e s f o r h o w t o f o r m a t y o u r P y t h o n c o d e . I t i s i m p o r t a n t b e c a u s e i t s h o w s h o w t h e P y t h o n c o d e s h o u l d b e f o r m a t t e d .
  • 10. 9. Can you differentiate between pickling and Un- pickling in Python?  P i c k l i n g i n P y t h o n i s t h e p r o c e s s o f c o n v e r t i n g P y t h o n o b j e c t t o b y t e s t r e a m w h e r e a s u n p i c k i n g i s t h e r e v e r s e o p e r a t i o n o f t h e p i c k l i n g .
  • 11. 10. How will you find the bugs and errors in a Python code?  T o f i n d t h e b u g s a n d e r r o r s i n P y t h o n c o d e w e ’ l l u s e P y t h o n D e b u g g e r t o o l o r P D B .
  • 12. 11. Can you state the names of the tool which are used to find bugs in Python? P y C h e c k e r i s u s e d t o f i n d b u g s i n P y t h o n . P y l i n t i s a n o t h e r t o o l w h i c h c a n b e u s e d t o d e t e c t e r r o r s .
  • 13. 12. How can you alter functions in Python syntax?  B y u s i n g P y t h o n d e c o r a t o r s w e c a n a l t e r t h e f u n c t i o n s e a s i l y .
  • 14. 13. What is the use of dictionaries in Python?  D i c t i o n a r i e s i n P y t h o n a r e u s e d f o r m a p p i n g o f u n i q u e k e y s t o v a l u e s .
  • 15. 14. What are the major two versions of Python Programming language? P y t h o n 2 . 0 a n d P y t h o n 3 . 0 a r e t h e t w o v e r s i o n s u s e d P y t h o n p r o g r a m m i n g l a n g u a g e .
  • 16. 15. What is “The Zen of Python”?  I t i s t h e p r i n c i p l e w h i c h i n f l u e n c e s t h e d e s i g n o f t h e p y t h o n p r o g r a m m i n g .
  • 17. 16. Which command do you use to exit the help window in Python programming?  T o e x i t t h e h e l p w i n d o w i n P y t h o n p r o g r a m m i n g ‘ p r e s s q ’ .
  • 18. 17. How would you list all the built-in functions and variables in Python?  B y u s i n g h e l p ( ) f u n c t i o n o r d i r ( ) f u n c t i o n w e c a n l i s t a l l t h e b u i l t - i n f u n c t i o n s t h a t a r e a v a i l a b l e i n t h e P y t h o n .
  • 19. 18. Explain module in Python?  T h e M o d u l e i s u s e d t o s t r u c t u r e a P y t h o n p r o g r a m . M o d u l e s b a s i c a l l y c o n t a i n a s e t o f f u n c t i o n s w h i c h y o u w a n t t o u s e i n a P y t h o n p r o g r a m .
  • 20. 19. How will you find methods or attributes of an object?  W e c a n f i n d m e t h o d s o r a t t r i b u t e s o f a n o b j e c t b y u s i n g b u i l t - i n f u n c t i o n s . H e l p ( ) o r d i r ( ) c a n b e u s e d t o f i n d t h e a t t r i b u t e s o f a n o b j e c t .
  • 21. 20. What do you know about mutable and immutable types in Python? They are the built-in  T y p e s o f P y t h o n . M u t a b l e b u i l t - i n t y p e s a r e l i s t , s e t s , a n d d i c t i o n a r i e s . I m m u t a b l e b u i l t - i n t y p e s a r e s t r i n g s , t u p l e s , a n d n u m b e r s .
  • 22. 21. Why isn’t memory freed whenever the Python exits?  M e m o r y i s n ’ t f r e e d b e c a u s e P y t h o n d o e s n o t t r y t o d e s t r o y e v e r y s i n g l e o f i t s o b j e c t . A l s o , c e r t a i n b i t s o f m e m o r y a r e d i s t r i b u t e d b y t h e C l i b r a r y w h i c h i s i m p o s s i b l e t o g e t f r e e .
  • 23. 22. Can you explain the term monkey patching in Python?  M o n k e y P a t c h i n g i s a m e t h o d b y w h i c h w e c a n e x t e n d o u r p r o g r a m m i n g w h i l e r u n t i m e . W e c a n m o d i f y t h e c o d e o r e x t e n d s i t w h i l e r u n t i m e .
  • 24. 23. What does “*args” and “**kwargs” means and why do have to use it? * a r g s a n d * * k w a r g s a r e t h e s p e c i a l s y n t a x u s e d f o r t h e f u n c t i o n t o p a s s a v a r i a b l e n u m b e r o f a r g u m e n t s t o a f u n c t i o n i n a P y t h o n .
  • 25. 24. How will you modify the strings in Python? Can you name all of them?  W e c a n u s e d i f f e r e n t f u n c t i o n s w h i c h c a n b e u s e d t o m o d i f y t h e s t r i n g s . S p l i t ( ) , s u b ( ) , a n d s u b n ( ) a r e t h e f u n c t i o n s u s e d t o m o d i f y t h e s t r i n g s i n P y t h o n .
  • 26. 25. Can u state the difference between range and xrange in Python? State their uses.  B o t h a r e u s e d t o g e n e r a t e a l i s t o f n u m b e r f o r t h e u s e r t o u s e . T h u s o n l y d i f f e r e n c e i s t h a t x r a n g e o n l y r e t u r n s t h e x r a n g e o b j e c t w h e r e a s r a n g e r e t u r n s t h e P y t h o n l i s t o f o b j e c t .
  • 27. 26. Explain the term unittest. What is the use of unittest in Python?  U n i t t e s t i n P y t h o n p r o v i d e s a u n i t t e s t i n g f r a m e w o r k . I t h e l p s i n a u t o m a t i o n t e s t i n g , s h u t d o w n c o d e f o r t e s t s , a g g r e g a t i o n o f t e s t s a n d i n d e p e n d e n c e t e s t s .
  • 28. 27. Can you convert a string to a number and how?  Y e s , w e c a n c o n v e r t a s t r i n g t o a n u m b e r b y u s i n g b u i l t - i n f u n c t i o n s i n P y t h o n . F o r e x a m p l e , c h = “ 4 7 8 9 ” i s a s t r i n g w h i c h c a n b e c o n v e r t e d t o a n i n t e g e r b y u s i n g n u m = i n t ( c h )
  • 29. 28. Can you copy an object in Python and how?  Y o u c a n n o t c o p y m o s t o f t h e o b j e c t s b u t s t i l l b y u s i n g c o p y . c o p y ( ) o r c o p y . d e e p c o p y ( ) w e c a n c o p y a n o b j e c t i n P y t h o n .
  • 30. 29. Can you copy an object in Python and how?  Y o u c a n n o t c o p y m o s t o f t h e o b j e c t s b u t s t i l l b y u s i n g c o p y . c o p y ( ) o r c o p y . d e e p c o p y ( ) w e c a n c o p y a n o b j e c t i n P y t h o n .