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Top 30 Python Interview Questions and Answers
1. What is Python?
- Python is an object-oriented and high-end programming language which is primarily used for web and app development. It was developed by Guido van Rossum, and it is released in 1991. It is used for server-side web development, system scripting, mathematics, and Application development.
2. What are the benefits of using Python and what do you understand PEP8?
- Some of the advantages of using Python programming language are
- It has extensive support libraries.
- It has an excellent integration feature. With Python, it is easy to develop web services through invoking COBRA and COM components.
- Through the strong integration features, the unit testing framework and enhanced control capabilities, it enhances the speed for many applications.
- The Python language comprises of extensive programmers productivity through its support libraries and object-oriented designs.
PEP8 is Python Enhancement Proposals which a tool to verify your python code against some of the style conventions. It also provides a reference point for the Pythonic way to write code.
3. What datatypes does python support?
- Basically, Python supports 14 Data Types.
- int: It is used to symbolize integral values, Python2 had a datatype called long but from Python3 long can also be used and it is represented by int.
4. What are the key features of Python?
- It has an easy to use syntax
- Python is easy to write programming language
- Python comes with a large standard library which supports many common programming tasks such as connecting to web servers, searching text with regular expressions, reading and modifying files.
- It is easy to test short snippet of code.
- Its free software.
- It can run on all platforms
5. What type of language is Python? Programming or scripting?
- Python is considered a scripting language due to its historic blur between scripting languages and general-purpose programming languages. In fact, Python is not a pure scripting language, but a general-purpose programming language that also works as well as a scripting language.
6. How is Python an interpreted language?
- An interpreted language is whichever programming language that isn’t already implemented in “machine code” prior to runtime. So, Python will be under byte code interpreted. The .py source code is initially compiled to byte code as .pyc. This byte code can be interpreted (CPython), or JIT-compiled (PyPy). Python(Cpython) is neither a true compiled time nor a purely interpreted language but it is called interpreted language.
7. What is the difference between list and tuple in Python?
- The list is mutable while tuple is not mutable in Python which is the major difference. Tuple can be hashed for e.g as a key for dictionaries.
8. What is Python?
If a function makes a call to itself, it is called recursion. In order to avoid forming an infinite loop, we must have a base condition.
def facto(n): if n==1: return 1 return n*facto(n-1) facto(4)
9. How would you convert a string into an int in Python?
When a string contains only numerical characters, you can easily convert it into an integer using the int() function.
int('235') 235 Let’s check the types: type('235')
10. What is the statement that can be used in Python if the program requires no action but requires syntactically?
- The pass statement is a null operation in Python. When it is executed, nothing will happen. You should always use “pass” keyword in lower case. For example,
letter = "Hi Hello!" for i in letter: if i == "H": pass print("Letter Found:", i) else: pass
11. Define modules in Python:
The module is defined as a file that consists of a set of various functions and Python statements which we want to add in our application.
Example of creating a module:
To create a module first, we need to save the code which we want in a file with a .py extension. save the module with module.py
def wishes(name): Print("Hi, " + name)
12. Name the builtin types available in Python:
- The built-in types in Python are as follows:
- Complex numbers
- Floating-point numbers
- Built-in functions
13. What is for-else and while-else in Python?
For-else loops :
for loops also have an else clause. The else clause executes after the loop. This means that the loop did not encounter a break statement.
for item in container: if search_something(item): # Found it! process(item) break else: # Didn't find anything.. not_found_in_container()
While-else loops :
The else block is executed only if while condition is false
while condition1: if condition2: break else: print('I am here because condition1 is False')
14. What is pickling and unpickling?
- The Pickle module accepts whatever Python object and converts it into a string representation and put it into a file by using a dump function, this process is called pickling. While the process of recovering original Python objects from the stored string representation is called unpickling.
15. What is the purpose of PYTHONSTARTUP, PYTHONCASEOK, and PYTHONHOME environment variables?
It includes the path of an initialization file containing Python source code. It will be executed every time you start the interpreter. It is called as .python rc.py in Unix and it holds commands that load utilities or modify PYTHON PATH
PYTHONCASEOK − It is used in Windows OS to instruct Python to find the first case-insensitive match in an import statement. Set this variable to any value to activate it.
PYTHONHOME − It is an alternative module search path. It is generally embedded in the PYTHONSTARTUP or PYTHON PATH directories to compose switching module libraries easy.
16. Mention what are the rules for local and global variables in Python?
When a variable is assigned a new value anyplace within the function’s body, it’s implicit to be local.
The variables that are referenced only inside a function are absolutely global.
17. How do you remove the leading whitespace in a string?
- strip() Python String strip() function in Python will remove leading and trailing whitespaces. If you like to remove only the leading or trailing spaces, you can use lstrip() or rstrip() function instead.
18. What are the tools that help to find bugs or perform the static analysis?
- PyChecker is a static analysis tool which detects the bugs in Python source code and it also warns the style and complexity of the bug. Pylint is another tool that checks whether the module meets the coding standard.
19. What are Python decorators?
- A Python decorator is an exact change which we make in Python syntax to alter functions easily.
20. What is frozenset in Python?
- Frozensets are just like sets in Python but they cannot be changed. Clearly, frozensets are the immutable version of Python sets.
21. What do you understand by the term namespace in Python?
- A namespace in Python is defined as a system which is designed to provide a unique name for each object in python. Types of namespaces present in Python are as follows
- Local namespace
- Global namespace
- Built-in namespace
22. Define the Scope of an object in Python:
- Scope points to the availability and accessibility of an object in the coding region in Python.
23. Mention what is the difference between Django, Pyramid, and Flask?
- Flask is a “microframework” which was primarily built for a small application with very minimal requirements. In flask, you need to use external libraries. Flask is ready to use.
Pyramid is built for very larger applications. It gives flexibility and lets the developer use the right tools for their project. The developer can choose the database, URL structure, templating style, etc for the project. Pyramid is usually heavy configurable.
Like Pyramid, Django can also be used for larger applications. It comprises of an ORM.
24. Mention what is Flask-WTF and what are their features?
- Flask-WTF provides simple integration with WTForms. Features in Flask WTF are:
- Integration with wtforms
- Secure form with csrf token
- Global csrf protection
- Internationalization integration
- Recaptcha supporting
- File upload that works with Flask Uploads
25. What is Python String format and Python String replace?
Python String Format:
The String format() method in Python is largely used to format the provided string into an accurate output or result.
Syntax for String format() method:
<template.format(p0, p1, …, k0=v0, k1=v1, …)
Python String Replace:
This method is primarily used to return a copy of the string in which all the happening of the substring is replaced by another substring.
Syntax for String replace() method:
str.replace(old, new [, count])
26. Name some of the built-in modules in Python?
- The built-in modules in Python are as follows:
- sys module
- OS module
- random module
- collection module
- Math module
27. What is namespace in Python?
- In Python, every name launched has a place where it resides and can be hooked for. This is defined as namespace. The namespace is like a box where a variable name is mapped to object placed. Each time the variable is searched out, this box will be searched, to obtain corresponding object.
28. What are the functions in Python?
- In Python, functions are defined as a block of code that is executable only when it is called. The def keyword is used to define a function in Python.
def Func(): print("Hello, Welcome to Courseinn") Func(); #calling the function Output: Hello, Welcome to Courseinn
29. Explain lambda expressions. When would you use one?
- If we want a function with a single expression, we can very well define it anonymously. A lambda expression might take input and returns a value. We type the following code in the interpreter to define the above function as a lambda expression.
(lambda a,b:a if a>b else b)(3,3.5)
30. What are the applications of Python?
- Some of the applications of Python are:
- GUI based desktop applications
- Image processing applications
- Business and Enterprise applications
- Web and web framework applications
Python course is basically a really fun and rewarding language to discover and I think anyone can be able to get to a high level of capability in it. In the event that they find the right motivation. I hope this guide has been useful in your journey. If you have some other methods to suggest, please let us know! Find out more about how you can learn Python course, Python Certification and add this skill to your portfolio by visiting Dataquest.