Python Interview Questions

1) What is Python?

Python was created by Guido van Rossum, and released in 1991.

It is a general-purpose computer programming language. It is a high-level, object-oriented language which can run equally on different platforms such as Windows, Linux, UNIX, and Macintosh. It is widely used in data science, machine learning and artificial intelligence domain know more at Python online training

Why Python?

• Python is compatible with different platforms like Windows, Mac, Linux, Raspberry Pi, etc.
• Python has a simple syntax as compared to other languages.
• Python allows a developer to write programs with fewer lines than some other programming languages.
• Python runs on an interpreter system, means that the code can be executed as soon as it is written. It helps to provide a prototype very quickly.
• Python can be described as a procedural way, an object-orientated way or a functional way.

2. What are the applications of Python?

Python is used in various software domains some application areas are given below.

• Web and Internet Development
• Games
• Scientific and computational applications
• Language development
• Image processing and graphic design applications
• Enterprise and business applications development
• Operating systems
• GUI based desktop applications

Python provides various web frameworks to develop web applications. The popular python web frameworks are Django, Pyramid, Flask.

Python’s standard library supports for E-mail processing, FTP, IMAP, and other Internet protocols. know more at Python training

Python’s SciPy and NumPy helps in scientific and computational application development.

Python’s Tkinter library supports to create a desktop based GUI applications.

3. What are the advantages of Python?

• Interpreted
• Free and open source
• Extensible
• Object-oriented
• Built-in data structure
• Readability
• High-Level Language
• Cross-platform
  Interpreted: Python is an interpreted language. It does not require prior compilation of code and executes instructions directly.
• Free and open source: It is an open source project which is publicly available to reuse. It can be downloaded free of cost.

4. What is PEP 8?

PEP 8 is defined as a document that helps us to provide the guidelines on how to write the Python code. It was written by Guido van Rossum, Barry Warsaw and Nick Coghlan in 2001.

It stands for Python Enhancement Proposal, and its major task is to improve the readability and consistency of Python code.

5. What do you mean by Python literals?

Literals can be defined as a data which is given in a variable or constant. Python supports the following literals:

String Literals

String literals are formed by enclosing text in the single or double quotes. For example, string literals are string values.

E.g.:

“Aman”, ‘12345’.

6. Explain Python Functions?

A function is a section of the program or a block of code that is written once and can be executed whenever required in the program. A function is a block of self-contained statements which has a valid name, parameters list, and body. Functions make programming more functional and modular to perform modular tasks. Python provides several built-in functions to complete tasks and also allows a user to create new functions as well. know more at Python online training from India

7. What is zip() function in Python?

Python zip() function returns a zip object, which maps a similar index of multiple containers. It takes an iterable, convert into iterator and aggregates the elements based on iterables passed. It returns an iterator of tuples.

8. What is Python’s parameter passing mechanism?

There are two parameters passing mechanism in Python:

• Pass by references
• Pass by value

By default, all the parameters (arguments) are passed “by reference” to the functions. Thus, if you change the value of the parameter within a function, the change is reflected in the calling function as well. It indicates the original variable. For example, if a variable is declared as a = 10, and passed to a function where it?s value is modified to a = 20. Both the variables denote to the same value.

The pass by value is that whenever we pass the arguments to the function only values pass to the function, no reference passes to the function. It makes it immutable that means not changeable. Both variables hold the different values, and original value persists even after modifying in the function.

9. What is swapcase() function in the Python?

It is a string’s function which converts all uppercase characters into lowercase and vice versa. It is used to alter the existing case of the string. This method creates a copy of the string which contains all the characters in the swap case. If the string is in lowercase, it generates a small case string and vice versa. It automatically ignores all the non-alphabetic characters. See an example below.

10. How to remove whitespaces from a string in Python?

To remove the whitespaces and trailing spaces from the string, Python providies strip([str]) built-in function. This function returns a copy of the string after removing whitespaces if present. Otherwise returns original string.

11. How to remove leading whitespaces from a string in the Python?

To remove leading characters from a string, we can use lstrip() function. It is Python string function which takes an optional char type parameter. If a parameter is provided, it removes the character. Otherwise, it removes all the leading spaces from the string. know more at Python course

12. Why do we use join() function in Python?

The join() is defined as a string method which returns a string value. It is concatenated with the elements of an iterable. It provides a flexible way to concatenate the strings. See an example below.