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Pandas Interview Questions and Answers

Pandas Interview Questions and Answers

In this post, we’re going to provide you with a list of questions and answers to help you get started with Pandas. So whether you’re a beginner or an experienced user.

Pandas Interview Questions and Answers for Freshers

  1. What is Pandas Python?


Working with “relational” or “labelled” data is made simple and intuitive with  the help of the Python module Pandas, which offers quick, adaptable, and  expressive data structures. One of its main purpose is serve as a building block to use python for actual and useful data analysis


  1. What is Python Pandas used for?


Pandas is a data analysis and manipulation software package created for the Python programming language. It includes specific data structures  Under the terms of the three-clause BSD licence, pandas is a piece of free software.


  1. What is the series in Pandas?


A one-dimensional labelled array called the Pandas Series can hold any kind of  data (integer, string, float, python objects, etc.). Pandas Series is only an Excel sheet’s column.


  1. Mention the different types of data structure in pandas?


Series and Data Frames are the two types of data structures that the pandas  library support.


  1. Explain reindexing in pandas?


Re-indexing entails converting the Data Frame to a new index with optional filling  logic and inserting NA/Nan in places where the prior index had no value. It  modifies a Data Frame’s row names and column labels.


  1. Mention some important features of pandas library?


Pandas support a lot of features. Some of them are :


  • Data Alignment
  • Memory Efficient
  • Reshaping
  • Merge and join
  • Time Series


  1. What is Pandas used for?


For the purpose of conducting operations like data manipulation and analysis,  among other things, this library was created for the Python programming  language. The library offers a number of procedures and data structures for  working with time series and mathematical tables.


  1. What is the time series in Pandas?


A time series is an organised collection of data that essentially depicts the  evolution of a certain number through time. Pandas has a wide range of features  and capabilities for handling time series data across all areas


  1. Explain Categorical Datas in pandas?


Statistics categorical variables are represented by the pandas data type  categorical. A categorical variable has a fixed, typically constrained set of  possible values (categories; levels in R). Examples include things like gender,  social class, blood type, nationality, length of observation, or rating using Likert  scales.


The following scenarios make use of the categorical data type:


  • A string variable with a limited range of values. Such a string variable can be transformed into a category variable to reduce memory usage.


  • The logical order (“one,” “two,” and “three”) and the lexical order of a variable are not the same. Sorting and min/max will make advantage of  the categorical conversions and the categories’ specified orders. logical sequence as opposed to lexical sequence,


  • Other Python libraries should be informed that this column should be handled as a categorical variable via this signal


  1. Which method is commonly used to rename the index or column of dataframes of pandas?


To rename the index or column of pandas dataframe, you can use . rename method.


  1. What is the definition of Numpy?


Numpy is an already built function. It stands for Numerical Python


  1. What is a Numpy array in pandas?


Numerical Python is an already built function in Python, which can be used to perform numerical computations. It can also be used to process single dimensional and multi dimensional array elements.


  1. Which function can be used to convert dataframe into Numpy?


Pandas dataframe is usually converted into a numpy array to perform high level mathematical computations.


DataFrame.to_numpy ( ) is used for converting dataframe into Numpy.


  1. How to sort data frames on pandas?


Sorting of dataframes in pandas can be done effectively by two kinds. They are :


  • By label
  • By actual value


  1. What is GroupBy and what is its use?


Groupby ( ) is a function which helps to divide the given data into a number of groups. GroupBy ( ) function can be used effectively to rearrange data based on real world data sets.

Pandas Interview Questions and Answers

  1. What is called a pandas index?


Pandax index is an important tool which is used to choose rows and columns of data from a data frame. The primary task of pandas index is to organise data and make sure that data can be easily accessed.


  1. What are time Periods in Pandas?


Time periods in pandas represent the time span. Time periods in pandas can be in days, weeks, months, years etc.


  1. How can you make a copy of the series in pandas?


The following syntax can be used if you want to create a copy of the series in pandas






  1. What do you mean by data aggregation in pandas?


The primary objective of pandas is to add some aggregation to one or more rows and columns. It is mainly done by using the Functions – Sum, Min, Max


  1. Is it possible to iterate over data frames in pandas?


Yes, it is possible to iterate data frames. A For loop function in combination with iterrows ( ) call is used for iterating data frames.


  1. Mention the unique styles of information shape in pandas?


Series and Data Frames are the 2 styles of information systems that the panda’s  library supports. The basis for each information system is NumPy. Pandas has

a one-dimensional information shape known as Series and a two-dimensional  information shape known as Data Frame. Another axis label, Panel, a three-D  information shape with elements, most important axis, and minor axis, is  likewise present


  1. Explain reindexing in pandas?


Re-indexing includes changing Data Frame to a brand-new index with  optionally available, filling good judgement and placing NA/Nan in locations in  which the previous index had no value. It modifies a Data Frame’s row names  and column labels.


  1. How are we able to create replicas of collections in Pandas?


Pandas.Series.replica Series. Copy(deep=True) pandas.Series.replica.


Make a  deep replica, inclusive of a replica of the information and the indices. With  deep=False neither the indices or the information is copied. Note that once  deep=True information is copied, real python gadgets will now no longer be  copied recursively, simplest the connection with the object.


  1. How do you create a sequence from dict in Python?


The one-dimensional labelled array referred to as a “Series” can store any form  of information (integers, strings, floating factor numbers, Python gadgets, etc.).  A Series, not like Python lists, will continually encompass information of the  equal kind, it ought to be saved in mind. See the way to make a Pandas Series  using a dictionary. Applying the Series () technique without the index  parameter.


Pandas Advanced Interview questions and answers


  1. How can we convert strings into date time in pandas?


Strings can be converted to data by using date time method. This method is smart enough to convert strings to date time.


  • First of all, Choose which information you want to convert.
  • Then create a data frame to capture the above information in python.
  • Convert the strings into date time in the data


  1. How can you find the missing elements in an array in Pandas?


The missing elements can be found by following methods:


  • First, create an empty array for missing elements.
  • Then loop over the missing elements within the first and last elements range
  • Compare the loop with the given array. If the values are not present, append it to the missing array.


  1. How can you convert INT data type into string data type?


The integers can be converted to data by following methods:





Values. Astype


  1. How can you convert a series into a data frame in Pandas?


Converting a series  into a data frame is a straightforward process in pandas. In pandas, the frame method is used to convert a series into a data frame easily.


  1. How is the percentile in pandas calculated for a numerical series?



is the axis which is used to compute percentiles in Pandas. Axis 0 is used for row wise while  Axis 1 is used for column wise. Percentiles are important because they  are used to understand and interpret the data.


  1. How will you compute the quantile of a numerical series in Pandas?



It is a float or an array that provides the values of quantiles in pandas which can be further helpful in performing the calculations. Quantiles give information about the shape of distribution in particular.


  1. What are data frames in Pandas?


Data frame is one type of data structure. It is a two dimensional labelled structure, just like a two dimensional array or a table with rows and columns. It is defined as a standard way to store data and has two indexes. The indexes are row and column index. They are widely used in data science, machine learning, scientific computing and much more.


  1. Mention the core features of pandas


The core features of pandas are:


  • They provide great data handling
  • They are helpful in handling the missing data
  • They are advantageous in indexing and alignment of data
  • They provide tools for input and output
  • They offer data clean up and support multiple file formats
  • They also provide joining and merging of data and much more


  1. What is multiple indexing in Pandas?


Multi index  is an array of tuples where each tuple is unique. A multi index can be created by using lists of arrays. It allows you to select more than one row and column in your index. We use a multi index to speed up the process of search when you have a lot of data.


  1. What are the advantages and disadvantages of a multi level index ?


The advantages are:


  • They increase performance of searching in records and sorting records
  • They help in grouping records and maintaining a unique column


The disadvantages are:


  • They increase disk space
  • They slower data modification
  • They update records in a cluster index


  1. For which programming language is the Pandas tool designed for?


Pandas is the data manipulation and analysis tool which has been written for programming language.


  1. Mention the ways by which a data frame can be created


The ways are:

  • Numpy arrays
  • Dictionary
  • List


  1. How can you create an empty data frame in Pandas?


The empty data frame can be created in Pandas by the given codes:


Import the pandas library

Import pandas as pd. frame

Print info


  1. How can we convert a data frame into an excel file?


This can be done by using the (to excel) function. If we want to write a single word in an excel file, we have to specify the target file name. If you want to write multiple sheets, we need to create an Excel writer with the target file name and also need to specify the sheet in the file in which we have written.


  1. What is time offset?


The offset is used to specify the set of dates which confirm the date offset. We can create the date offsets for moving the dates forward to valid dates.


  1. How can we set the index?


We can set the column index while making the data frame. This is also helpful in setting the row index.


  1. How can we reset the index?


The index of a data frame can be reset by using the reset-index command. But if the data frame has multi-index then in this case this method can remove one or more levels.


  1. Mention data operations which are used in Pandas


The data operations which are being used in Pandas are:


  • Row and column selection
  • Filter data
  • Null values


  1. How can I fix Panda errors in python?


The error can be simply fixed by correcting the spelling of the key. If we are sure about the spelling of  the key we can simply print the list of all column names and cross-check.


  1. Are pandas written in C or C++?


The pandas low level modules that are IO are written in  Cython which is a language somewhere between python and CC.


  1. Is pandas better than SQL?


Pandas allow you to transfer metadata flexibly while in SQL you can not do this. Moreover, in pandas you have the ability to operate on column names easily but in SQL  you need to manually specify how the name of a column changes. These are the pieces of evidence that pandas are better than SQL.


  1. Should I use pandas or excel?


The comparison between Pandas and Excel is given below:




Pandas is much faster than Excel, which is noticeable especially when you are working with larger data.




The tasks which have been achieved by  Pandas are easier to automate than excel. In this way pandas are better than Excel so you should use Pandas rather than excel.

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