Python Interview Questions And Answers
Python is an object-oriented high-level language. It is an interpreter based programming language, interactive and object-oriented scripting language. It supports methods such as functional and structured as well as OOP. Python some set of libraries of open-source data analysis tools, web frameworks, and testing instruments. It also features consistency, stability, and easiness of use. So if you have finally found your dream job in Python but are wondering how to crack the Python Interview and what could be the 2020 probable Python Interview Questions. Every interview is different, and the scope of a job is different too. Keeping this in mind, we have designed the most common Python Interview Questions and Answers to help you get success in your interview.
Below are the top 2020 Python Interview Questions and Answers. These interview questions are divided into two parts:
Part 1 – Python Interview Questions (Basic)
This first part covers basic Python interview questions and answers.
1. What are Python, and name some key features of it?
Answer :
Python is an interpreter-based programming language, interactive and object-oriented scripting language. Python is designed to be highly readable.
- It is an interpreter based language which means that, unlike other languages like C and variants, the compilation doesn’t require before running.
- It’s dynamically typed, which means you need not to define the data types of the declared variables and anything like that.
E.g., You can declare variable x=10 and then x=”Hello World” without error; it will define the datatype by default depending on its value.
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- 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. Differentiate between tuples and lists in python?
Answer:
The major difference is tuples are immutable while a list is mutable. It means once you create a tuple, you cannot edit or make changes in the value in a tuple, while in a list, we can edit the value in it.
| Tuples | List |
| A tuple is a sequence of immutable objects | List are versatile datatype which is Mutable |
| The syntax for Tuples are shown by parenthesis {} | The syntax for List is shown by square brackets [] |
| They are of fixed length | The list can be of variable length |
| Eg: tup_1 = { 10,’john’,5} | Eg : list_1 = [10, ‘john’, 5] |
3. What are the types of Operator used in Python?
Answer:
The types of operators which Python uses are listed below:
- Arithmetic Operators
| Operator | Name | Description |
| + | Add | It adds values. |
| – | Subtract | It Subtracts the right-hand value from the left side value. |
| * | Multiply | It multiplies. |
| / | Divide | It divides left-hand value by right side value. |
| % | Module | It divides the left-hand side operand by the right-hand side operand and gives back the remainder. |
| ** | Exponent | Performs exponential calculation on values. |
- Relational Operators
| Operator | Description |
| == | If the two values come equal, then the condition becomes true. |
| != | If the values of two operands are not equal, then the condition is true. |
| <> | If two values are not equal, then the condition is true. |
| > | If the left operand is greater than the right operand, then the condition is true. |
| < | If the left operand is less than the right operand, then it’s true. |
| >= | If the left operand is greater than or equal to the right operand, then it’s true. |
| <= | If the left operand is less than or equal to the right operand, then the condition is true. |
- Assignment Operators
| Operator | Name |
| = | AND |
| += | ADD AND |
| -= | SUBTRACT AND |
| *= | MULTIPLY AND |
| /= | DIVIDE AND |
| %= | MODULUS AND |
| **= | EXPONENT AND |
4. What will the maximum length of an identifier?
Answer:
There is no certain length for Identifier; Identifier can be of any length.
Let move on to the next Python Interview Questions.
5. What do you mean by Decorators?
Answer:
For modifying or injecting code in functions or classes, we use Decorators in Python. With the help of decorators, we can check for permissions and for logging the calls.
6. What do you mean by the dictionary in Python?
Answer:
The built-in data types of Python known as Dictionary. For e.g. “Country”.
7. Explain Memory Management in Python?
Answer:
Python memory is management is done by python private heap space. All the objects and data structures of pythons are located in a private heap.
8. Explain Python is one Line?
Answer:
Python is a modern, powerful interpreted language with threads, objects, modules, exceptions, and automatic memory management.
Let us move on to the next Python Interview Questions.
9. Explain the Interpretation in Python?
Answer:
Programs in python run directly from the source code.
10. Explain the rules for local and global variables in Python?
Answer:
Global variable: If the variable is defined outside the function, then it is Global.
Local Variable: If a variable is assigned a new value inside the function, then it is local
11. How to share global variable in Python?
Answer:
By creating a config file and store the global variable to be shared across modules.
12. How to pass optional or keyword parameters from one function to another in Python?
Answer:
We can arrange arguments using the * and ** specifiers in the function’s parameter list.
Part 2 – Python Interview Questions (Advanced)
This first part covers basic Python interview questions and answers.
13. What are the different types of sequences in Python?
Answer:
Different types of sequences in Python are Strings, Unicode strings, lists, tuples, buffers and xrange objects.
14. What is Lambda form in Python?
Answer:
Lambda keyword is used to create small random anonymous throw away functions.
15. What is Pickling in Python?
Answer:
Pickle is a standard module that serializes and de-serializes a Python object structure.
16. How can an object be copied in Python?
Answer:
By using two ways, objects can be copied in python: Shallow copy & Deep copy.
Let us move to the next Python Interview Questions.
17. How do I convert a string to a number?
Answer:
There are different built-in functions by which we can convert values from one data type to another.
18. Describe how to send an email from a Python Script?
Answer:
The smtplib module is used to defines an SMTP client session object that can be used to send email using Pythons Script.
19. What is the command used for exiting the help command prompt?
Answer:
The command name is “quit.”
20.What does the split(), sub() and subn() methods do?
Answer:
Split() its uses a regex pattern to split any given string into a created list.
Sub() It will find all the substring where this regex pattern will match and then replace the string.
Subn() It is similar to a sub(); it will return the new string along with the other no. of replacements.
21. Mention the way to display the text contents of the files in reverse order?
Answer:
First, convert the file into the list and, after that, reverse this list by utilizing reversed ().
22. What are ODBS modules for Python?
Answer:
1. PythonWin ODBC module 2. MxODBC 3. pyodbc
Let us move on to the next Python Interview Questions.
23. What will append() and extend methods do?
Answer:
append() adds the element at the end.
extend() adds the elements of a different list at the end.
24. What is TKIner?
Answer:
The Tklner is the library of Python. It is one of the toolkits for developing the GUI.
25. What is the difference between Java and Python?
Answer:
Java has a static data type, while Python has a dynamic typed-data type.
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This has been a guide to the List Of Python Interview Questions and Answers. Here we have covered the few commonly asked interview questions with their detailed answers so that candidates can crack interviews with ease. You may also look at the following articles to learn more –
