Python interview questions

Today, we are going highlight the most interesting and very important topic regarding Python language. As a programmer, we all know that Python is one of the most in-demanding programming languages sought after by employers for its usefulness. And most of the companies, either big or small, are hunting for good Python programmers and ready to shell out higher pays for the right candidates. But the main point is the companies don't hire Python programmers directly from the candidates' name, they take interviews and check out the qualities of the candidates. That's why, we write this article, here, we will highlight some essential Python interview questions to acquaint you with the skills and knowledge that will help you to crack the job interviews.

Let's check out the questions -

First of all, most of the time they started with the basic question. They asked -

Q. What is Python?

Ans. Python is a high-level, interpreted, interactive and object-oriented scripting language. Python is designed to be highly readable. It uses English words frequently whereas other languages use punctuation. It's one of the most successful interpreted languages. In Python script, it doesn’t need to get compiled before execution.

Q. What are the benefits of using Python?

Ans. When using Python -

• There is no need to be mentioned as the date type of variables during their declaration. It allows to set variables like var1=101 and var2 =” You are an engineer.” without any error.

• It supports object-oriented programming (OOP) that helps to define classes along with the composition and inheritance. It doesn’t use access specifiers like public or private.

• Functions in Python are like first-class objects. It suggests to assign them to variables, return from other methods and pass as arguments.

• Developing is quick but its run-time is often slower than compiled languages. It enables to include the “C” language extensions that can help to optimize scripts.

• It has several usages like web-based applications, test automation, data modeling, big data analytics and much more. Alternatively, it can be utilize as “glue” layer to work with other languages.

Q. Do you have any personal projects?

Ans. This shows that you are willing to do more than the bare minimum in terms of keeping your skill set up to date. If you work on personal projects and code outside of the workplace then employers are more likely to see you as an asset that will grow. Even if they don’t ask this question, we think, it’s useful to broach the subject.

Q. What is PEP 8?

Ans. PEP 8 is a coding convention, a set of recommendation, about how to write Python code more readable.

Q. What are the tools that help to find bugs or perform the static analysis?

Ans. PyChecker is a static analysis tool that detects the bugs in Python source code and warns about the style and complexity of the bug. Pylint is another tool that verifies whether the module meets the coding standard.

Q. How is Python executed?

Ans. Python files are first compiled to bytecode and are then executed by the host. “OR” Type python.pv at the command line.

Q. Is python a case-sensitive language?

Ans. Yes! Python is a case sensitive programming language.

Q. What is tuples in Python?

Ans. A tuple is another sequence data type that is similar to the list. A tuple consists of a number of values separated by commas. Unlike lists, however, tuples are enclosed within parentheses.

Q. What are Python dictionaries?

Ans. Python dictionaries are kind of hash table type. They work like associative arrays or hashes found in Perl and consist of key-value pairs. A dictionary key can be almost any Python type but are usually numbers or strings. Values, on the other hand, can be any arbitrary Python object.

Q. How will you get all the keys from the dictionary?

Ans. Using dictionary.keys() function, we can get all the keys from the dictionary object.

print dict.keys()   # Prints all the keys

Q. How will you get all the values from the dictionary?

Ans. Using dictionary.values() function, we can get all the values from the dictionary object.

print dict.values()   # Prints all the values

Q. How will you convert a string to an int in python?

Ans. int(x [,base]) - Converts x to an integer. base specifies the base if x is a string.

Q. How will you convert a string to a long in python?

Ans. long(x [,base] ) - Converts x to a long integer. base specifies the base if x is a string.

Q. What is a module and package in Python?

Ans. The module is the way to structure a program. Each Python program file is a module, which imports other modules like objects and attributes. The folder of the Python program is a package of modules.  A package can have modules or subfolders.

Q. Name few Python Web Frameworks for developing web applications?

Ans. There are various web frameworks provided by Python. They are

web2py - it is the simplest of all the web frameworks used for developing web applications.

cherryPy - it is a Python-based Object-oriented Web framework.

Flask - it is a Python-based micro-framework for designing and developing web applications.

Q. What is the namespace in Python?

Ans. In Python, every name introduced has a place where resides and can be found. This space is known as a namespace. It is an address location where a variable name is mapped to the object placed. Whenever the variable is searched out, this address location will be searched, to get the corresponding object.

Q. When would you use a continue statement in a for loop?

Ans. When processing a particular item is complete, to move on to the next, without executing further processing in the block continue statement is used. The continue statement states, the current item is done processing, move on to the next item.

Q. When would you use a break statement in a for loop?

Ans. The break statement states that the function of the loop is over and to move on to the next block of code. For example, when the item being searched is found, there is no need to keep looping. The break statement comes into play here and the loop terminates and the execution moves on to the next section of the code.

Q. What is lambda in Python?

Ans. It is a single expression anonymous function often used as an inline function.

Q. Why does lambda forms in python not have statements?

Ans. A lambda form in python does not have statements as it is used to make new function object and then return them at runtime.

Q. In Python what is slicing?

Ans. A mechanism to select a range of items from sequence types like list, tuple, strings etc. is known as slicing.

Q. Explain how to delete a file in Python?

Ans. By using a command os.remove (filename) or os.unlink(filename).

Q. Explain how can you access a module written in Python from C?

Ans. To access a module written in Python from C by the following method,

Module =  =PyImport_ImportModule(“”);

Q. Mention the use of // operator in Python?

Ans. It is a Floor Division Operator, which is used for dividing two operands with the result as quotient showing only digits before the decimal point. For instance, 10//5 = 2 and 10.0//5.0 = 2.0.

Q. How will you get the min alphabetical character from the string?

Ans. min(str) − Returns the min alphabetical character from the string str.

Q. How will you replace all occurrences of an old substring in a string with new string?

Ans. replace(old, new [, max]) − Replaces all occurrences of old in the string with new or at most max occurrences if max gave.

Q. How will you remove all leading and trailing whitespace in a string?

Ans. strip([chars]) − Performs both lstrip() and rstrip() on string.

Q. How will you change case for all letters in the string?

Ans. swapcase() − Inverts case for all letters in the string.

Q. How will you get titlecased version of string?

Ans. title() − Returns “title-cased” version of the string, that is, all words begin with uppercase and the rest are lowercase.

Q. How will you convert a string to all uppercase?

Ans. upper() − Converts all lowercase letters in the string to uppercase.

Q. How will you check in a string that all characters are decimal?

Ans. isdecimal() − Returns true if a Unicode string contains only decimal characters and false otherwise.

Q. What is the difference between del() and remove() methods of the list?

Ans. To remove a list element, you can use either the del statement if you know exactly which element(s) you are deleting or the remove() method if you do not know.

 

Lastly say, these are all not only questions that you will be asked by the employers. There is a huge list of questions available related to Python language that interviewer may ask, actually, it only depends on them that what they are looking for and how they examine you. Hope this article successfully guided you and helped you to understand the level of interview questions regarding Python language. Best of luck for the future! Thank you!