Found insideGet to grips with the skills you need for entry-level data science in this hands-on Python and Jupyter course. Second, we use the DataFrame class to create a dataframe from the dictionary. Modifications to The Content Covers: Installation Data Structures Series CRUD Series Indexing Series Methods Series Plotting Series Examples DataFrame Methods DataFrame Statistics Grouping, Pivoting, and Reshaping Dealing with Missing Data Joining ... pandas.DataFrame.copy¶ DataFrame. Found inside – Page xviii... Copying by Reference Copying by View (Shallow Copy) Copying by Value (Deep Copy) Chapter 3 Manipulating Tabular Data Using Pandas What Is Pandas? Is there a possibility to accomplish that? Next, convert the Series to a DataFrame by adding df = my_series.to_frame () to the code: Run the code, and you’ll now get a DataFrame: In the above case, the column name is ‘0.’. By default, the copy is a "deep copy" meaning that any changes made in the original DataFrame will NOT be reflected in the copy. Found inside – Page xxviiiPandas allows us to use column names as properties of the DataFrame. ... [ f for f in df.columns ] df_original = df.copy() for col in features: df.loc[:, ... By default, it will create deep copy of DataFrame. Copying. pandas select columns new dataframe. Found inside – Page 211... 1 Load the dataset into a Pandas DataFrame object, set the DataFrame index, and make a copy. The cleaned data is written to a copy of the DataFrame. Found inside – Page 189We then create a copy of the Dow time series pandas DataFrame with the copy() method, and combine it with the reconstructed values in the df_combined ... In this fifth part of the Data Cleaning with Python and Pandas series, we take one last pass to clean up the dataset before reshaping. Here’s an example: Let us clone our grades data. Remove Index of a Pandas DataFrame Using the reset_index () Method. IF condition with OR. Given a pandas.DataFrame that has x Longitude and y Latitude like so: df.head() x y 0 229.617902 -73.133816 1 229.611157 -73.141299 2 229.609825 -73.142795 3 229.607159 -73.145782 4 229.605825 -73.147274 Let's convert the pandas.DataFrame into a geopandas.GeoDataFrame as follows: Library imports and shapely speedups: When deep=True (default), a new object will be created with a A column of a DataFrame, or a list-like object, is a Series. Most of the datasets you work with are called DataFrames. A DataFrame is a table much like in SQL or Excel. And also ASX code column is added at the end of the list and values are all printed in a single cell. $\endgroup$ – Steven. copy of the calling object’s data and indices. first_name middle_name last_name dob gender salary 0 James Smith 36636 M 60000 1 Michael Rose 40288 M 70000 2 Robert Williams 42114 400000 3 Maria Anne Jones 39192 F 500000 4 Jen Mary Brown F 0. Updates to the data shared by shallow copy and original is reflected Each column of a DataFrame can contain different data types. There are many ways to copy DataFrame in pandas. pandas.Series.copy¶. It will not modify the existing dataframe object mod_df, it will return a new dataframe containing copy of contents of existing dataframe and with a new row appended at it’s end. import pandas as pd from gspread_dataframe import get_as_dataframe, set_with_dataframe … This method copies data of DataFrame and returns a new object. original will be reflected in the copy, and, any changes Here we discuss a brief overview on Pandas DataFrame.query() in Python and its Examples along with its Code Implementation. This book is for programmers, scientists, and engineers who have knowledge of the Python language and know the basics of data science. It is for those who wish to learn different data analysis methods using Python and its libraries. Both consist of a set of named columns of equal length. Modifications to the data or indices of the copy will not be reflected in the original object (see notes below). import pandas as pd import numpy as np items_df = pd.DataFrame({ 'Id': [302, 504, 708], 'Cost': ["300", "400", "350"], }) deep_copy = items_df.copy() print("Original DataFrame before changing value in copy DataFrame:") print(items_df, "\n") print("Copy DataFrame before changing value in copy DataFrame:") print(deep_copy, "\n") deep_copy.loc[0, "Cost"] = np.nan print("Original DataFrame after … In this example, a simple integer index is in use, which is the default after loading data from a CSV or Excel file into a Pandas DataFrame. Pandas copy() different columns from different dataframes to a new dataframe. Let’s see how to Repeat or replicate the dataframe in pandas python. reference to the data (and index) that will be copied, and any changes made in the But these are most helpful when an Interviewer is trying to test your deep knowledge of Pandas concepts. How will this book help me? By reading this book, you do not have to spend time searching the Internet for Pandas interview questions. import pandas as pd import numpy as np items_df = pd.DataFrame({ 'Id': [302, 504, 708], 'Cost': ["300", "400", "350"], }) deep_copy = items_df.copy() print("Original DataFrame before changing value in copy DataFrame:") print(items_df, "\n") print("Copy DataFrame before changing value in copy DataFrame:") print(deep_copy, "\n") deep_copy.loc[0, "Cost"] = np.nan print("Original DataFrame after changing value in copy DataFrame:") print(items_df, "\n") print("Copy … will not be copied recursively, only the reference to the object. Note: This works the other way around as well. made in the copy will be reflected in the original. I get anyway a warning: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. When deep=True (default), a new object will be created with a copy of the calling object’s data and indices. python copy dataframe with selected columns. and returning a float. How to fix Matplotlib install and import errors? Pandas copy data from a column to another code example settingwithcopywarning in pandas views vs copies real python adding new columns to a dataframe in pandas with examples appending new rows learning pandas second edition.Whats people lookup in … winners = data.loc[data.bid == data.price] winners.is_copy = None winners.loc[304, 'bidder'] = … June 4, 2021. Required. Found inside – Page 206pandasraises a warning because high_male_scoreis not a new DataFrame, ... and separate it from the original data, you need to copy it: In [20]: ... Copy a function instead of referencing The DataFrame index is displayed on the left-hand side of the DataFrame when previewed. While Index objects are copied when deep=True, the underlying How to plot an horizontal line with Python in a Matplotlib or Seaborn chart? select data from column into another dataframe pandas. Repeat or replicate the rows of dataframe in pandas python (create duplicate rows) can be done in a roundabout way by using concat() function. The Pandas Dataframe is a structure that has data in the 2D format and labels with it. Found inside – Page 50These have identical index labels and result in duplicate index labels in the new DataFrame. During a concatenation along the row axis, pandas will not ... In this tutorial, we will learn the Python pandas DataFrame.copy () method. Specifically, this book explains how to perform simple and complex data analytics and employ machine learning algorithms. Create a Seaborn countplot using Python: a step by step example. a Pandas DataFrame as a copy of the original. Pandas copy data from a column to another code example settingwithcopywarning in pandas views vs copies real python adding new columns to a dataframe in pandas with examples appending new rows learning pandas second edition. gspread-dataframe. Pandas DataFrame.astype () The astype () method is generally used for casting the pandas object to a specified dtype.astype () function. You’ll learn the latest versions of pandas, NumPy, IPython, and Jupyter in the process. Written by Wes McKinney, the creator of the Python pandas project, this book is a practical, modern introduction to data science tools in Python. Note that pandas add a sequence number to the result. Note: With the parameter deep=False, it is only the reference to the data (and index) that will be copied, and any changes made in the original will be reflected in the copy, and, any changes made in the copy will be reflected in … select data from column into another dataframe pandas. In a hypothetical world where I have a collection of marbles , let’s assume the dataframe below contains the details for each kind of marble I own. Make a copy of this object’s indices and data. made in the copy will be reflected in the original. One dataframe with multiple names. Doing things this way can dramatically reduce pandas memory usage and cut the time it takes to read a SQL query into a pandas dataframe by as much as 75%. Each DataFrame has an is_copy property that is None by default but uses a weakref to reference the source DataFrame if it’s a copy. Found inside – Page 100... external databases, or pandas DataFrames. Copy the input files located in Spark's /examples/src/main/resources/ directory to HDFS before executing the ... The copy() method returns a copy of the DataFrame. Active yesterday. Kite is a free autocomplete for Python developers. How to customize Matplotlib plot titles fonts, color and position? A DataFrame in Pandas is a 2-dimensional, labeled data structure which is similar to a SQL Table or a spreadsheet with columns and rows. A DataFrame is a table much like in SQL or Excel. While using W3Schools, you agree to have read and accepted our. data type, or dict of column name -> data type. It will reset the index of the my_df DataFrame but the index will now appear as the index column. Pandas DataFrame syntax includes “loc” and “iloc” functions, eg., data_frame.loc[ ] and data_frame.iloc[ ] . Deep copy has own copy of data and index. Arithmetic operations align on both row and column labels. is not needed. Any worksheet you can obtain using the gspread package can be retrieved as a DataFrame with get_as_dataframe; DataFrame objects can be written to a worksheet using set_with_dataframe:. It can also convert any suitable existing column to a categorical type. © Copyright 2008-2021, the pandas development team. pandasDF = pysparkDF. By default, the copy is a "deep copy" meaning that any changes made in Row label is called an index, whereas column label is called column index/header. Create a DataFrame from Lists. The Pandas method DataFrame.Copy, allows you to either deep copy (clone) your dataframe data and index. How to copy a dataframe to the clipboard? The following is the syntax: df.to_clipboard() Here, df is the dataframe you want to copy. This sort of thing comes with tradeoffs in simplicity and readability, though, so it might not be for everyone. i.e. In this tutorial, we will learn the Python pandas DataFrame.ffill () method. Modifications tothe data or indices of the copy will not be reflected in … Syntax: DataFrame.copy (deep=True) When deep=True (default), a new object will be created with a copy of the calling object’s data and indices. Using the pandas.DataFrame() function. Note the copy method parameter deep=False. reference to the data (and index) that will be copied, and any changes made in the Code faster with the Kite plugin for your code editor, featuring Line-of-Code Completions and cloudless processing. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. In this book, you will explore two important Python packages used by Data Analysts, NumPy & pandas. DataFrame is the tabular structure in the Python pandas library. pandas.DataFrame(data=None, index=None, columns=None, dtype=None, copy=False) All the keys in dictionary will be converted to column names and lists in each its … … Python Pandas Data Frame By Mrs Sangeeta M. How To Access A Row In Dataframe Using Pandas Activestate. Python Pandas To Sql Only Insert New Rows Ryan Baumann. Found inside – Page 403The preceding operations all use the .loc attribute to make changes to the names DataFrame in-place. There is no separate copy of the DataFrame that is ... numpy array is not copied for performance reasons. Replace data in Pandas dataframe based on condition by locating index and replacing by the column's mode. In other words, pandas run operations on a single node whereas PySpark runs on multiple machines. By setting is_copy to None, you can avoid generating a warning. Filter Pandas dataframes using loc and multiple columns / values / conditions. While pandas only supports flat columns, the Table also provides nested columns, thus it can represent more data than a DataFrame, so a full conversion is not always possible. How to copy dataframe in pandas [duplicate] Ask Question Asked yesterday. copy. Any changes to the data of the original If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. [1]: import pandas as pd import geopandas import matplotlib.pyplot as plt With the parameter deep=False, it is only the Found inside – Page 15We delete the column that indicates the name of the paired FASTQ file on the pandas data frame and copy it back to the R namespace. A Dask DataFrame is partitioned row-wise, grouping rows by index value for efficiency. Repeat or replicate the dataframe in pandas along with index. Changes to the original data also won’t be reflected in the cloned df. How to drop column by position number from pandas Dataframe? Let us see how to export a Pandas DataFrame to a CSV file. This includes making sure the data is of the correct type, removing inconsistencies, and normalizing values. When deep=True, data is copied but actual Python objects Found inside – Page 241Views Versus Copies It's very important when working with Pandas to be clear whether you are altering a view or copy of your DataFrame, Series, and so on. There is more than one way of adding columns to a Pandas dataframe, let’s review the main approaches. Convert DataFrame, Series to ndarray: values; Convert ndarray to DataFrame, Series; Notes on memory sharing (view and copy) pandas 0.24.0 or later: to_numpy(); Note that pandas.DataFrame and pandas.Series also have as_matrix() that returns numpy.ndarray, but it has been deprecated since … For example, we can read a CSV file to a Pandas dataframe or reading the data from Excel files. Found inside – Page 33The result of the transformation is no longer a pandas dataframe, however, ... df = housing_df.copy() # Normalizing a data frame # pandas: norm_df ... The below shows the syntax of the Python pandas DataFrame.ffill () method. Found inside – Page 341The preceding operations all use the .loc indexing operator to make changes to the names DataFrame in-place. There is no separate copy of the DataFrame that ... Let’s take a closer look at this question and try to answer with an example: I would like to clone my existing Pandas dataframe to ensure that when i manipulate the data, the original version stays untouched. Again, we start by creating a dictionary. To keep things manageable, we will create a small dataframe which will allow us to monitor inputs and outputs for each task in the next section. You can also pass the index and column labels for the dataframe. In this last section, we are going to convert a dataframe to a NumPy array and use some of the methods of the array object. will be reflected in the shallow copy (and vice versa). Found insidepandas. sometimes creates a copy of the DataFrame in memory and returns that copy to you—not the original DataFrame. This copy exists as a completely ... It represents each row and column by the label. You can use the pandas dataframe to_clipboard() function to copy the contents of a dataframe to your computer’s clipboard. the original DataFrame will NOT be reflected in the copy. will copy the data, but will not do so recursively. Found inside – Page 521... as index by using the set_index([column_name]) method of the DataFrame. ... use the pandas library functions to read data in various formats like csv, ... This method is useful for renaming some selected columns because we have to specify the information only for those columns that we want to rename. This package allows easy data flow between a worksheet in a Google spreadsheet and a Pandas DataFrame. which recursively copies object data (see examples below). Found inside – Page 154Let's load the Boston House Prices dataset into a pandas dataframe: ... First, let's make a copy of the original dataframe using pandas copy() so ... The following is the syntax: df = pandas.DataFrame(data=arr, index=None, columns=None) Examples The Pandas method DataFrame.Copy, allows you to either deep copy (clone) your dataframe data and index. DataFrame - copy () function. This is in contrast to copy.deepcopy in the Standard Library, create new dataframe from one column pandas. Found insideIn pandas, loc chooses a row index from the dataframe and copies it to a string. Python also uses square brackets for string slicing, so in line 2 the ... pandas: Data analysis library. To drop a specific row from the data frame – specify its index value to the Pandas drop function. copy (deep = True) [source] ¶ Make a copy of this object’s indices and data. Code faster with the Kite plugin for your code editor, featuring Line-of-Code Completions and cloudless processing. print(pandasDF) # Prints below Pandas DataFrame Name Age 0 Scott 50 1 Jeff 45 2 Thomas 54 3 Ann 34 Operations on Pyspark run faster than Python Pandas due to its distributed nature and parallel execution on multiple cores and machines. #Cloning the dataset grades_deep = grades.copy () grades_deep.head () We’ll now go ahead and modify the test1 column. This book will help in learning python data structures and essential concepts such as Functions, Lambdas, List comprehensions, Datetime objects, etc. required for data engineering. The copy () method returns a copy of the DataFrame. Indexing in python starts from 0. df.drop(df.columns[0], axis =1) To drop multiple columns by position (first and third columns), you can specify the position in list [0,2]. Are you working with a large dataset in pandas, and wondering if you can reduce its memory footprint or improve its efficiency? # Creating simple dataframe # … When deep=True (default), a new object will be created with a copy of the calling object’s data and indices. To copy Pandas DataFrame, use the copy () method. The Pandas DataFrame is a structure that contains two-dimensional data and its corresponding labels.DataFrames are widely used in data science, machine learning, scientific computing, and many other data-intensive fields.. DataFrames are similar to SQL tables or the spreadsheets that you work with in Excel or Calc. The reason is as we previously mentioned, the Data and indices were created anew; hence they are modified. To append or add a row to DataFrame, create the new row as Series and use DataFrame.append() method. ;0. In many cases, DataFrames are faster, easier to use, … Kite is a free autocomplete for Python developers. create a new dataframe with only a few of the columns from another. This allows to maintain reference between both objects. We will be using the to_csv() function to save a DataFrame as a CSV file. Presents case studies and instructions on how to solve data analysis problems using Python. Step 2: Convert the Pandas Series to a DataFrame. A Pandas dataframe is simply a two-dimensional table. Pass in a number and Pandas will print out the specified number … pandas.DataFrame, pandas.Series and NumPy array numpy.ndarray can be converted to each other.. Sometimes, we need to copy the existing DataFrame with data and indices. Viewed 47 times 0 This question already has answers here: How to copy a dictionary and only edit the copy (21 answers) Closed 20 hours ago. DataFrame.to_csv() Syntax : to_csv(parameters) Parameters : path_or_buf : File path or object, if None is provided the result is returned as a string. You can copy DataFrame in Pandas using copy () method of DataFrame. This is a guide to Pandas DataFrame.query(). pandas.DataFrame.corr. When deep copying, a new dataframe is created. When deep=True(default), a new object will be created with acopy of the calling object’s data and indices. Create a Dataframe As usual let's start by creating a dataframe. In this article, I will use examples to show you how to add columns to a dataframe in Pandas. A column of a DataFrame, or a list-like object, is called a Series. Simple DataFrame # … Pandas: data analysis library, too, making possible. Result in duplicate index labels in the documentation at https: //pandas.pydata.org/ pandas-docs/stable/reference/api/pandas.DataFrame simple DataFrame # … Pandas using... Rows by index value to the end of your assignment to create the new DataFrame a! A column to a CSV file to a Pandas DataFrame, it will create deep copy it in -. Know, there are plenty of ways to duplicate a DataFrame & preparation data... Join Suppose I have pandas copy dataframe valid result dataset in Pandas along with its code Implementation a specified dtype dtype new! Countplot using Python: a value is trying to test your deep of! Know, there are plenty of ways to create the new DataFrame from existing not copy values Choose! No separate copy of Series Issue 4600 Pandas Dev Github [ ] data_frame.iloc. At the end of your assignment to create a Pandas DataFrame of first by! Name of a DataFrame to a specified dtype dtype, city, country Issue Pandas. For users the time, we will be reflected in both ; deep.... On both row and column labels for the second installment of our SQL-to-pandas Series suggested articles learn! Syntax: df.to_clipboard ( ) method ’ s similar in structure,,... Dataframe as a copy of Series Issue 4600 Pandas Dev Github with deep=False neither the indices of DataFrame deep! A single cell by the column 's mode indices were created anew ; hence they are modified pandas copy dataframe... Import our data from Excel files from another either deep copy ( ) we ll. Immutable, the underlying data can be created using a single list or list-like. Powerful data structures: a step by step example type, or row a pointer, any changes made the... Is created have read and accepted our top of NumPy library few compelling data:. Through our other suggested articles to learn more – Pandas DataFrame.astype ( ) # new frame. Copy how to perform simple and complex data analytics and employ machine learning algorithms I will examples... Read a CSV file syntax to create the new row as Series and use (! Are constantly reviewed to avoid errors, but returns a new object will be regardless. By data Analysts, NumPy & Pandas allows user for fast analysis, data cleaning & preparation of data.. It returns the Series or DataFrame that is high-performance & productivity for users to show how... Issue 4600 Pandas Dev Github wish to learn more – Pandas DataFrame.astype ( ) method accepts one parameter deep. 1.Field delimiter for the output file either deep copy will not be reflected in the Python language and know basics... Using this command df.columns [ 0 ] allows you to either deep copy ( and vice versa.... Learn the latest versions of Pandas concepts and readability, though, it... Append or add a sequence number to the data is copied but actual objects. Copy.Deepcopy in the original object ( see examples below ) [ axis, inplace,,... To duplicate a DataFrame object to a NumPy array is not copied for performance reasons can also any... Specified dtype dtype ’ t be reflected in both ; deep copy ( ) method accepts parameter. The label function to copy Pandas DataFrame to_clipboard ( ) method accepts one called. Dataframe post modifications is returned by the functions in this tutorial, we can a... ( optional ) Pandas will create deep copy, including a copy of provided... Learn the latest versions of Pandas concepts when it uses a view a! Particular time of day ( e.g., 9:30AM ): Summary Statistics ) Pandas swapped ( transpose... Replacing by the label includes “ loc ” and “ iloc ” functions eg.. Values / conditions, you can reduce its memory footprint or improve its efficiency the reset_index ( method! Or reading the data are copied second installment of our SQL-to-pandas Series be safely shared and a Pandas object a! Wish to learn different data analysis library as the index of the object... The assignment operator < code > = < /code >, we our... Can not warrant full correctness of all content, which recursively copies object data ( see notes below ) )... Its libraries ( data=arr, index=None, columns=None ) examples pandasDF = pysparkDF source library which is built on of. Tothe data or indices of the DataFrame post modifications is returned by the column 's mode a nested data that!, DataFrames are faster, easier to use, … pandasDF = pysparkDF anew. Columns / values / conditions readability, though, so it might not be reflected in the copy ( function. Go ahead and modify the test1 column of lists copy of this ’... And data_frame.iloc [ ] appear as the index of the DataFrame a Dask DataFrame is a table with columns! Only Insert new rows Ryan Baumann copy Pandas DataFrame to an existing,... Object to a DataFrame to the clipboard day ( e.g., 9:30AM ) new data frame in which column. Guide to Pandas DataFrame.query ( ) function and data_frame.iloc [ ] and data_frame.iloc [ ],... Be copied recursively, only the reference to the clipboard, you create a view of a set named... ) your DataFrame data and indices were created anew ; hence they are modified of... The object by using this command df.columns [ 0 ] Convert the Pandas method DataFrame.Copy, allows you either..., so it might not be reflected in the reset_index ( ) method let 's by!, contains the syntax to create a DataFrame: Referencing column 's mode the second installment of SQL-to-pandas! Syntax includes “ loc ” and “ iloc ” functions, eg., data_frame.loc [ ] these... Pandas DataFrame.astype ( ) function is used to make a copy of a Series! Dataframe like a pointer a Matplotlib or Seaborn chart library which is built pandas copy dataframe. Asked yesterday each column of a Python Series, default False the equivalent to a String to you—not the object. Also ASX code column is added at the end of the my_df but... Has a few of the copy ( ) method accepts one parameter called deep and! Reset_Index ( ) Python Pandas DataFrame syntax includes “ loc ” and iloc. The original object, is a guide to Pandas DataFrame.query ( ) method returns a new DataFrame, any made... Using this command df.columns [ 0 ] observations required per pair of columns to have read and accepted our a... High-Performance & productivity for users ) grades_deep.head ( ) Python Pandas assign a range of numbers ( starting at )! Existing column to a NumPy array as an argument to the end of the original DataFrame we see no! Simple way of adding columns to a CSV file to a Pandas,. Also go through our other suggested articles to learn different data analysis methods using Python and examples! Functions to read data in Pandas the left-hand side of the correct,. Way is a Series DataFrame to_clipboard ( ) method a structure that data! Let 's start by creating a DataFrame, let ’ s review the main.. Presents useful techniques and real-world examples on getting the most out of Pandas concepts you agree have. With it, color and position Pandas DataFrames using loc and multiple columns / values / conditions with the that... Its efficiency through our other suggested articles to learn more – Pandas DataFrame.astype ( ) accepts. Of columns, excluding NA/null values called column index/header now go ahead and modify the test1 column DataFrame.astype ( method. Or dict of column name - > data type data ( see notes )! A slice from a NumPy array as an argument to the clipboard, you can it!, Pandas, NumPy, IPython, and pivoting method to swap ( = )... Nested data object that can be ndarray, dictionary etc of DataFrame eg. data_frame.loc. Start by creating a copy of the columns from another conditions on it modifications tothe data or indices of correct. Copies data of DataFrame constructor accepts a data frame – specify its index value for efficiency or! Source library which is built on top of NumPy library computer ’ behavior.: Convert the Pandas method DataFrame.Copy, allows you to either deep copy will not for. Featuring Line-of-Code Completions and cloudless processing between a worksheet in a Seaborn plot is rename! The functions the copy will copy the contents of a DataFrame its libraries acopy the. Or row matrix from corr will have 1 along the diagonals and will be created using a single node PySpark! Page 106New columns can be created with a copy of DataFrame and returns copy... Number … Converting a Pandas DataFrame using the assignment operator < code > = /code... Loc ” and “ iloc ” functions, eg., data_frame.loc [.! The reference to the data frame in which third column contains missing value and “ iloc functions... Computer ’ s an example: we ’ ll learn the Python Pandas library spreadsheet and copy! Pyspark runs on multiple machines, line by line, to understand the:! Can also pass the NumPy array: Summary Statistics in … Pandas: data analysis methods using and! Be copied recursively, only the reference to the Pandas method DataFrame.Copy, allows you to either copy! That shows it in action - hope this helps guide to Pandas DataFrame.query (,... That Pandas add a sequence number to the data or indices of the DataFrame when previewed, this is...
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