Frequently Asked Python Interview Questions and Answers

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 on different platforms such as Windows, Linux, UNIX, and Mac. Its high-level built-in data structures, combined with dynamic typing and dynamic binding. It is widely used in data science, machine learning and artificial intelligence domain.

It is widely used for

a) Web development (server-side)

b) Software development

c) Mathematics

d) System scripting

a) Python is an interpreted, object-oriented, high-level programming language with dynamic semantics

b) Python is compatible with different platforms like Windows, Mac, Linux, Raspberry Pi, etc.

c) Python has a simple syntax as compared to other languages.

d) Python allows a developer to write programs with fewer lines than some other programming languages.

e) Python runs on an interpreter system, means that the code can be executed as soon as it is written. 

f) Python can be described as a procedural way, an object-orientated way or a functional way.

g) The Python interpreter and the extensive standard library are available in source or binary form without charge for all major platforms, and can be freely distributed.

Before we understand a dynamically typed language, we should learn about what typing is. Typing refers to type-checking in programming languages. In a strongly-typed language, such as Python, "1" + 2 will result in a type error since these languages don't allow for "type-coercion" (implicit conversion of data types). On the other hand, a weakly-typed language, such as Javascript, will simply output "12" as result.

Type-checking can be done at two stages

a) Static - Data Types are checked before execution.

b) Dynamic - Data Types are checked during execution.

Python is an interpreted language, executes each statement line by line and thus type-checking is done on the fly, during execution. Hence, Python is a Dynamically Typed Language.

Every object in Python functions within a scope. A scope is a block of code where an object in Python remains relevant. Namespaces uniquely identify all the objects inside a program. However, these namespaces also have a scope defined for them where you could use their objects without any prefix. 

A few examples of scope created during code execution in Python are as follows:

a) A local scope refers to the local objects available in the current function.

b) A global scope refers to the objects available throughout the code execution since their inception.

c) A module-level scope refers to the global objects of the current module accessible in the program.

d) An outermost scope refers to all the built-in names callable in the program. The objects in this scope are searched last to find the name referenced.

Note: Local scope objects can be synced with global scope objects using keywords such as global

a) Free and Open Source: Python language is freely available at the official website and you can download it. Since it is open-source, this means that source code is also available to the public. So you can download it as, use it as well as share it.

a) Python is an interpreted language. That means that, unlike C & Java languages Python does not need to be compiled before it is run

b) Python is dynamically typed language, this means that you don’t need to state the types of variables when you declare them or anything like that. You can do things like x=111 and then x="I'm a string" without error

c) One of the key features of python is Object-Oriented programming. Python supports object-oriented language and concepts of classes, objects encapsulation, etc

d) GUI Programming Support: Graphical User interfaces can be made using a module such as PyQt5, PyQt4, wxPython, or Tk in python. PyQt5 is the most popular option for creating graphical apps with Python.

e)Extensible feature: Python is a Extensible language. We can write us some Python code into C or C++ language and also we can compile that code in C/C++ language.