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Top 139 Python Interview Questions
Entry Junior Mid Senior Expert
Python Theoretical Questions
Q1:
Name some characteristics of Python?
Entry
Q2:
What are the built-in types available In Python?
Entry
Q3:
How do I modify a string?
Entry
Q4:
What are the rules for local and global variables in Python?
Junior
Q5:
What are local variables and global variables in Python?
Junior
Q6:
What is Negative Index in Python?
Junior
Q7:
What are descriptors?
Junior
Q8:
Name some benefits of Python
Junior
Q9:
When to use a tuple vs list vs dictionary in Python?
tuple vs list vs dictionary in Python? Junior
Q10:
What is Lambda Functions in Python?
Junior
Junior
Junior
Q13:
Does Python have a switch-case statement?
Junior
Q14:
How the string does get converted to a number?
Junior
Q15:
What is the function of self?
self?
Mid Q16:
What does the Python nonlocal statement do (in Python 3.0 and later)?
nonlocal statement do (in Python 3.0 and later)? Mid Q17:
What is introspection/reflection and does Python support it?
Mid Q18:
Explain how to use Slicing in Python?
Mid Q19:
How can I create a copy of an object in Python?
Mid Q20:
How can you share global variables across modules?
Mid Q21:
What is the difference between range and xrange? How has this changed over time?
range and xrange? How has this changed over time? Mid Q22:
What are the Wheels and Eggs? What is the difference?
Mid Q23:
What are the key differences between Python 2 and 3?
2 and 3? Mid Q24:
What is a Callable?
Mid Mid Q26:
What are the Dunder/Magic/Special methods in Python? Name a few.
Mid Q27:
What does an x = y or z assignment do in Python?
x = y or z assignment do in Python? Mid Mid Q29:
What are virtualenvs?
Mid Q30:
What is the python with statement designed for?
with statement designed for? Mid Mid Mid Q33:
What's the difference between lists and tuples?
lists and tuples? Mid Q34:
Is it possible to have static methods in Python?
Mid Mid Q36:
Explain how does Python memory management work?
Mid Q37:
What's the difference between the list methods append() and extend()?
append() and extend()? Mid Mid Q39:
Why would you use the pass statement?
pass statement? Mid Q40:
What are Decorators in Python?
Mid Q41:
What are immutable objects in Python?
Mid Q42:
What does this stuff mean: *args, **kwargs? Why would we use it?
*args, **kwargs? Why would we use it? Mid Q43:
What is Pickling and Unpickling?
Mid Q44:
What is a None value?
None value? Mid Mid Q46:
What is the difference between range and xrange functions in Python?
range and xrange functions in Python? Mid Q47:
Explain the UnboundLocalError exception and how to avoid it?
UnboundLocalError exception and how to avoid it? Mid Q48:
What is Monkey Patching and is it ever a good idea?
Mid Q49:
PY Related To: Recommendation Systems
How would you create a Recommender System for Text Inputs?
PY Related To: Recommendation Systems Mid Q50:
Is there a tool to help find bugs or perform static analysis?
Mid Q51:
What is MRO in Python? How does it work?
Senior Q52:
Explain how you reverse a generator?
Senior Q53:
What is the difference between deep and shallow copy?
Senior Q54:
What is Monkey Patching? How to use it in Python?
Senior Q55:
What are the advantages of NumPy over regular Python lists?
Senior Q56:
Why aren't Python nested functions called closures?
Senior Q57:
What is the difference between a function decorated with @staticmethod and one decorated with @classmethod?
@staticmethod and one decorated with @classmethod? Senior Q58:
PY Related To: Genetic Algorithms
How is Differential Evolution different from Genetic Algorithms?
PY Related To: Genetic Algorithms Senior Senior Q60:
How to work with transitive dependencies?
Senior Q61:
What are metaclasses in Python?
Senior Q62:
What's the difference between a Python module and a Python package?
Senior Q63:
What is the difference between @staticmethod and @classmethod?
@staticmethod and @classmethod? Senior Q64:
Why are default values shared between objects?
Senior Q65:
What is GIL?
Senior Q66:
Is it a good idea to use multi-thread to speed your Python code?
Senior Q67:
Why Python (CPython and others) uses the GIL?
Senior Q68:
What is the difference between old style and new style classes in Python?
Senior Q69:
How is set() implemented internally?
set() implemented internally? Senior Q70:
Can you explain Closures (as they relate to Python)?
Senior Q71:
What is an alternative to GIL?
Senior Q72:
How is memory managed in Python?
Senior Q73:
What is the purpose of the single underscore _ variable in Python?
_ variable in Python? Senior Q74:
What is Cython?
Senior Q75:
Why are Python's private methods not actually private?
Senior Q76:
Why would you use metaclasses?
Expert Q77:
Related To: Keras
How to train a network only on one output when there are multiple outputs in Keras?
Related To: Keras Expert Q78:
Describe Python's Garbage Collection mechanism in brief
Expert Q79:
Is there a simple, elegant way to define singletons?
Expert Q80:
Why use else in try/except construct in Python?
else in try/except construct in Python? Expert Q81:
What is a global interpreter lock (GIL) and why is it an issue?
Expert Q82:
Is there any downside to the -O flag apart from missing on the built-in debugging information?
-O flag apart from missing on the built-in debugging information? Expert Q83:
What does Python optimisation (-O or PYTHONOPTIMIZE) do?
-O or PYTHONOPTIMIZE) do? Expert Q84:
Why isn't all memory freed when Python exits?
Expert Python Practical Challenges
Entry Junior Junior Q4:
JSJavaPY Related To: Fibonacci Series, Data Structures
Return the N-th value of the Fibonacci sequence. Solve in O(n) time
JSJavaPY Related To: Fibonacci Series, Data StructuresO(n) time Junior Q5:
Given variables a and b, switch their values so that b has the value of a, and a has the value of b without using an intermediary variable
a and b, switch their values so that b has the value of a, and a has the value of b without using an intermediary variable Junior Q6:
JavaPY Related To: Binary Tree, Trees, Data Structures
How to implement a Tree data-structure? Provide some code.
JavaPY Related To: Binary Tree, Trees, Data Structures Junior Q7:
JSJavaPY Related To: Fibonacci Series, Data Structures
Return the N-th value of the Fibonacci sequence Recursively
JSJavaPY Related To: Fibonacci Series, Data Structures Junior Q8:
PY Related To: Linked Lists, Data Structures
Convert a Singly Linked List to Circular Linked List
PY Related To: Linked Lists, Data Structures Junior Q9:
Suppose lst is [2, 33, 222, 14, 25]. What is lst[-1]?
lst is [2, 33, 222, 14, 25]. What is lst[-1]? Junior Q10:
JavaPY Related To: Binary Tree, Data Structures
Implement Pre-order Traversal of Binary Tree using Recursion
JavaPY Related To: Binary Tree, Data Structures Junior Q11:
Is this valid in Python and why?
Mid Q13:
What is the most efficient way to concatenate many strings together?
Mid Q15:
Write a program to check whether the object is of a class or its subclass
Mid Mid Mid Q18:
After executing the above code, what is the value of y?
y? Mid Mid Q20:
How to make a flat list out of list of lists?
Mid Q21:
CSPY Related To: Binary Tree, Data Structures
Can you do Iterative Pre-order Traversal of a Binary Tree without Recursion?
CSPY Related To: Binary Tree, Data Structures Mid Q22:
JavaPY Related To: Binary Tree, Divide & Conquer, Linked Lists, Recursion, Data Structures
Convert a Binary Tree to a Doubly Linked List
JavaPY Related To: Binary Tree, Divide & Conquer, Linked Lists, Recursion, Data Structures Mid Q23:
JSJavaPY Related To: Backtracking, Strings, Data Structures
Find all the Permutations of a String
JSJavaPY Related To: Backtracking, Strings, Data Structures Mid Q24:
How do I check if a list is empty?
Mid Q25:
CSJavaPY Related To: Strings, Data Structures
How to check if two Strings (words) are Anagrams?
CSJavaPY Related To: Strings, Data Structures Mid Q26:
JSJavaPY Related To: Arrays, Data Structures
How to merge two sorted Arrays into a Sorted Array?
JSJavaPY Related To: Arrays, Data Structures Mid Mid Q28:
Related To: Keras
What does the Lambda layer do in Keras? What would be the output of this model?
Related To: Keras Mid Q29:
JSJavaPY Related To: Dynamic Programming, Data Structures
LIS: Find length of the longest increasing subsequence (LIS) in the array. Solve using DP.
JSJavaPY Related To: Dynamic Programming, Data Structures Mid Q30:
What will be the output of the code below?
Senior Q31:
JSPY Related To: Searching
Explain when and how to use Exponential (aka Doubling or Galloping) Search?
JSPY Related To: Searching Senior Q32:
PY Related To: Neural Networks
Explain how would you train Perceptron? Implement in plain Python
PY Related To: Neural Networks Senior Senior Senior Senior Q36:
PY Related To: Logistic Regression
How would you train Logistic Regression? Implement in Python
PY Related To: Logistic Regression Senior Q37:
PY Related To: Gradient Descent, Linear Regression
How would you train Linear Regression model using Gradient Descent? Implement in Python
PY Related To: Gradient Descent, Linear Regression Senior Q38:
PY Related To: Linear Regression
How would you train Linear Regression model using Normal Equation? Implement in Python
PY Related To: Linear Regression Senior Q39:
How do I write a function with output parameters (call by reference)
Senior Q40:
Create function that similar to os.walk
os.walk Senior Q41:
What will be returned by this code?
Senior Q42:
Whenever you exit Python, is all memory de-allocated?
Senior Q43:
Show me three different ways of fetching every third item in the list
Senior Q44:
How to make a chain of function decorators?
Senior Q45:
JavaPY Related To: Linked Lists, Data Structures
Find the length of a Linked List which contains Cycle (Loop)
JavaPY Related To: Linked Lists, Data Structures Senior Q46:
Will the code below work? Why or why not?
Senior Q47:
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures
Explain what is Fibonacci Search technique?
CSJSJavaPY Related To: Divide & Conquer, Fibonacci Series, Searching, Data Structures Senior Q48:
CSJSJavaPY Related To: Fibonacci Series, Data Structures
Binet's formula: How to calculate Fibonacci numbers without Recursion or Iteration?
CSJSJavaPY Related To: Fibonacci Series, Data Structures Senior Senior Q50:
How to read a 8GB file in Python?
8GB file in Python? Expert Q51:
PY Related To: Decision Trees
Explain how you would implement CART training algorithm in plain Python
PY Related To: Decision Trees Expert Expert Q53:
What will this code return?
Expert Q54:
How do I access a module written in Python from C?
Expert Q55:
How should one access nonlocal variables in closures in python 2.x?
Expert 
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