Skip to main content

Top 25 Python Interview Questions and Answers Prepared by Experts


1. What is JSON? How would convert JSON data into Python data?
JSON – stands for JavaScript Object Notation. It is a popular data format for storing data in NoSQL
databases. Generally JSON is built on 2 structures.
  1.  A collection of <name, value> pairs.
  2.  An ordered list of values.
    As Python supports JSON parsers, JSON-based data is actually represented as a dictionary in Python. You can convert json data into python using load() of json module.

2. How are the functions help() and dir() different?
These are the two functions that are accessible from the Python Interpreter. These two functions are used for viewing a consolidated dump of built-in functions.
  • help() – it will display the documentation string. It is used to see the help related to modules, keywords, attributes, etc.
    To view the help related to string datatype, just execute a statement help(str) – it will display the documentation for ‘str, module. ◦ Eg: >>>help(str) or >>>help() – it will open the prompt for help as help>
  • to view the help for a module, help> module module name Inorder to view the documentation of ‘str’ at the help>, type help>modules str
  • to view the help for a keyword, topics, you just need to type, help> “keywords python- keyword” and “topics list”
  • dir() – will display the defined symbols. Eg: >>>dir(str) – will only display the defined symbols. 
3. Which command do you use to exit help window or help command prompt?
quit
When you type quit at the help’s command prompt, python shell prompt will appear by closing the help window automatically. 
4. Does the functions help() and dir() list the names of all the built_in functions and variables? If no, how would you list them?
No. Built-in functions such as max(), min(), filter(), map(), etc is not apparent immediately as they are
available as part of standard module.To view them, we can pass the module ” builtins ” as an argument to “dir()”. It will display the
built-in functions, exceptions, and other objects as a list.>>>dir(__builtins )
[‘ArithmeticError’, ‘AssertionError’, ‘AttributeError’, ……… ] 
5. Explain how Python does Compile-time and Run-time code checking?
Python performs some amount of compile-time checking, but most of the checks such as type, name, etc are postponed until code execution. Consequently, if the Python code references a user -defined function that does not exist, the code will compile successfully. In fact, the code will fail with an exception only when the code execution path references the function which does not exists.

Comments

Post a Comment

Popular posts from this blog

Android Interview Questions and Answers

What is  Android ? It is an open-sourced operating system that is used primarily on mobile devices, such as cell phones and tablets. It is a Linux kernel-based system that’s been equipped with rich components that allows developers to create and run apps that can perform both basic and advanced functions. What Is the Google Android SDK? The Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices. It contains a graphical interface that emulates an Android driven handheld environment, allowing them to test and debug their codes. >>Read more>>
Post a Comment
Read more

Tableau Interview Questions and Answers

What is Data Visualization? A much advanced, direct, precise and ordered way of viewing large volumes of data is called data visualization. It is the visual representation of data in the form of graphs and charts, especially when you can’t define it textually. You can show trends, patters and correlations through various data visualization software and tools; Tableau is one such data visualization software used by businesses and corporates. What are the differences between Tableau desktop and Tableau Server? While Tableau desktop performs data visualization and workbook creation, Tableau server is used to distribute these interactive workbooks and/or reports to the right audience. Users can edit and update the workbooks and dashboards online or Server but cannot create new ones. However, there are limited editing options when compared to desktop. Tableau Public is again a free tool consisting of Desktop and Server components accessible to anyone. >>Read more>...
3 comments
Read more

Data Science in Python Interview Questions and Answers

Q1). How can you build a simple logistic regression model in Python? Q2). How can you train and interpret a linear regression model in SciKit learn? Q3).Name a few libraries in Python used for Data Analysis and Scientific computations. Ans1.2.3:   NumPy, SciPy, Pandas, SciKit, Matplotlib, Seaborn   Q4).Which library would you prefer for plotting in Python language: Seaborn or Matplotlib? Ans4:   Matplotlib is the python library used for plotting but it needs lot of fine-tuning to ensure that the plots look shiny. Seaborn helps data scientists create statistically and aesthetically appealing meaningful plots. The answer to this question varies based on the requirements for plotting data.   Q5).What is the main difference between a Pandas series and a single-column DataFrame in Python? Q6). Write code to sort a DataFrame in Python in descending order. Q7). How can you handle duplicate values in a dataset for a variable in Python? Q8). Which Random F...
3 comments
Read more