Top 25 Important Python Interview Questions

Python Interview Questions

Do you have a Python interview coming up? The team at GoApt has curated a list of 25 Python interview questions and answers for your preparation.

Python is an interpreted, high-level and general-purpose programming language. Created by Guido van Rossum and first released in 1991, Python’s design philosophy emphasizes code readability with its notable use of significant whitespace. Its language constructs and object-oriented approach aim to help programmers write clear, logical code for small and large-scale projects.

Python is dynamically typed and garbage-collected. It supports multiple programming paradigms, including structured (particularly, procedural), object-oriented, and functional programming. Python is often described as a “batteries included” language due to its comprehensive standard library. Source: Wikipedia

Python tutorials, Python tricks and tips, and whatnot…the kind of results that show up on Google or any other search engine show how popular this language is.

1. What is Python? What are some of the features of Python?

Python is an interpreter-based programming language. It is interactive and object-oriented. Python is designed to be highly readable. Some prominent features of python are:

  • It is an interpreter based language which means that unlike C and variants, the compilation isn’t required before running the program.
  • It’s dynamically typed which means you need not define the data types of the declared variables.
  • Functions are first-class objects in python.
  • Python can be used for different cross-platform applications like web-apps, scientific models, big data applications, and many more.

2. What are the types of operators in Python?

The types of operators present in Python are:

  • Arithmetic Operators.
  • Relational Operators.
  • Assignment Operators.

3. Differentiate between tuples and lists in Python.

The major difference between a tuple and a list is that tuples are immutable while lists are mutable. Once you create a tuple you cannot edit or make changes to the values present in the tuple, whereas the values in a list can be modified.

 Tuples                                List
A tuple is a sequence of immutable objects. The List is a versatile datatype consisting of mutable objects.
The syntax for tuple requires parenthesis {}. The syntax for List is shown by square brackets [].
A tuple is of fixed length. A list can be of variable length
E.g. tup_1 = { 10,’john’,5} E.g.  list_1 = [10, ‘john’, 5]

4. What will the maximum length of an identifier?

There is no maximum length for the identifier. An identifier can be of any length.

5. What do you mean by Decorators?

We use Decorators in Python for modifying or injecting code in functions or classes. With the help of decorators, the user can check for permissions and log the function calls.

Must Read: Django Interview Questions And Answers.

6. What is a dictionary in Python?

A dictionary is a collection which is unordered, changeable, and indexed. In Python, dictionaries are written with curly brackets, and they have keys and values.

E.g. sampleDictionary = {
  “car”“Honda”,
  “year”1964
}

7. Explain Memory Management in Python?

Memory management in Python is done using a private heap space. All the objects and data structures of pythons are located in the private heap.

8. What is Python in one line?

Python is a modern powerful interpreted language with threads, objects, modules, exceptions, and also has the property of automatic memory management.

9. Explain the interpretation process in Python?

The python code first gets converted into a file with the extension “pyc”. This is called python byte code. This byte code is then executed by the virtual machine. The virtual machine is the Python run time engine. It’s not a separate component but comes packaged with the installation file. The virtual machine executes the byte code instructions one by one.

10. What are local and global variables in Python?

Global variable: If the variable is defined outside the function, it is a Global variable.

Local Variable: If a variable is assigned a new value inside the function, it is a Local variable.

11. How do you share global variables in Python?

By creating a config file and storing the global variable to be shared across modules in that file.

12. How do you pass optional or keyword parameters from one function to another in Python?

You can arrange arguments using the * and ** specifiers in the function’s parameter list.

Also Read: Official Website of Python

13. What are the different types of sequences in Python?

The different sequences in Python are strings, unicode strings, lists, tuples, buffers, and range objects.

14. What is Lambda in Python?

The Lambda keyword is used to create small random anonymous throw away functions.

15. What is Pickling in Python?

Pickle is a standard module that serializes and de-serializes a Python object structure.

16. How can an object be copied in Python?

Objects can be copied in 2 ways in Python: shallow copy and deep copy.

17. How do I convert a string to a number?

There are different built-in functions to convert values from one data type to another.

Example: a = “50”

b = “108”

result = int(a) – int(b)

print(result)

The output will be an integer. Similarly, you can use float() to convert strings to floating point numbers.

18. How do you send emails from a Python script?

The smtplib module is used to defines an SMTP client session object that can be used to send emails using a Python script.

19. What command is used for exiting the help command prompt?

The command is “quit”.

20. What do the split(), sub() and subn() methods do?

Split() : it uses a regex pattern to split the given string into a list.

Sub() : It will find all the substrings that match the regex pattern provided and replace them with the new string.

Subn() : It is similar to sub() but it will also return the number of replacements along with the new string.

21. What is the process to display the text contents of a file in the reverse order?

First, convert the file into a list and then reverse this list by utilizing reverse().

22. What are ODBS modules for Python?

  • PythonWin ODBC module
  • MxODBC
  • Pyodbc

23. What is the use of append() and extend()?

append() : Adds the element at the end.

extend() : Adds the elements of a different list at the end.

24. What is TKinter or Tk in Python?

The Tklner Python library is used for developing the GUI.

25. One major difference between Java and Python?

Java is statically typed and Python is dynamically typed.

What other Python interview questions are you aware of? Where can one find useful Python tutorials? Do you have any Python tricks? We’d love to hear in the comments.

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