Top 50 Python Interview Questions


Python is a very popular language for Data Science and Machine learning projects. A lot of companies are looking for a software developers proficient in Python language.

This book contains basic to expert level Python interview questions that an interviewer asks. Each question is accompanied with an answer so that you can prepare for job interview in short time.
We have compiled this list after attending dozens of technical interviews in top-notch companies like- Google, Facebook, Netflix, Amazon etc.
Often, these questions and concepts are used in our daily programming work. But these are most helpful when an Interviewer is trying to test your deep knowledge of Python.
The difficulty rating on these Questions varies from a Fresher level software programmer to a Senior software programmer.
Once you go through them in the first pass, mark the questions that you could not answer by yourself. Then, in second pass go through only the difficult questions.
After going through this book 2-3 times, you will be well prepared to face a technical interview on Python for an experienced programmer.

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Sample questions are:

  • How will you improve the performance of a program in Python?
  • What are the benefits of using Python?
  • How will you specify source code encoding in a Python source file?
  • What is the use of PEP 8 in Python?
  • What is Pickling in Python?
  • How does memory management work in Python?
  • How will you perform Static Analysis on a Python Script?
  • What is the difference between a Tuple and List in Python?
  • What is a Python Decorator?
  • How are arguments passed in a Python method? By value or by reference?
  • What is the difference between List and Dictionary data types in Python?
  • What are the different built-in data types available in Python?
  • What is a Namespace in Python?
  • How will you concatenate multiple strings together in Python?
  • What is the use of Pass statement in Python?
  • What is the use of Slicing in Python?
  • What is the difference between Docstring in Python and Javadoc in Java?
  • How do you perform unit testing for Python code?
  • What is the difference between an Iterator and Iterable in Python?
  • What is the use of Generator in Python?
  • What is the significance of functions that start and end with _ symbol in Python?
  • What is the difference between xrange and range in Python?
  • What is lambda expression in Python?
  • How will you copy an object in Python?
  • What are the main benefits of using Python?
  • What is a metaclass in Python?
  • What is the use of frozenset in Python?
  • What is Python Flask?
  • What is None in Python?
  • What is the use of zip() function in Python?
  • What is the use of // operator in Python?
  • What is a Module in Python?
  • How can we create a dictionary with ordered set of keys in Python?
  • Python is an Object Oriented programming language or a functional programming language?
  • How can we retrieve data from a MySQL database in a Python script?
  • What is the difference between append() and extend() functions of a list in Python?
  • How will you handle an error condition in Python code?
  • What is the difference between split() and slicing in Python?
  • How will you check in Python, if a class is subclass of another class?
  • How will you debug a piece of code in Python?
  • How do you profile a Python script?
  • What is the difference between β€˜is’ and β€˜==’ in Python?
  • How will you share variables across modules in Python?
  • How can we do Functional programming in Python?
  • What is the improvement in enumerate() function of Python?
  • How will you execute a Python script in Unix?
  • What are the popular Python libraries used in Data analysis?
  • What is the output of following code in Python?
  • What is the output of following code in Python?
  • If you have data with name of customers and their location, which data type will you use to store it in Python?

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