pandas set column as index

The easiest and most popular one will be done via the .rename() method. Let us see how it works, You only need to decide which method you want to use. We mostly use .at[] because it reads a bit easier..at[]: Will take a row/column intersection of index labels.The key word is labels. It empowers us to be a better data scientist. Python | Change column names and row indexes in Pandas DataFrame Last Updated: 16-05-2020. Return a subset of the columns. Pandas set index () work sets the … Since pandas DataFrames and Series always have an index, you can’t actually drop the index, but you can reset it by using the following bit of code:. You can pass the column name as a string to the indexing operator. By default an index is created for DataFrame. In that case, you may apply the code below to accomplish this goal: As you can see, the ‘Product’ column would now become the new index: Alternatively, you may use this approach to set multiple columns as the MultiIndex: For instance, let’s say that you’d like to set both the ‘Product‘ and ‘Brand‘ columns as the MultiIndex. By specifying parse_dates=True pandas will try parsing the index, if we pass list of ints or names e.g. In this example, we take a DataFrame, and try to set a column as index. The DataFrame is a 2D labeled data structure with columns of a potentially different type. Set the DataFrame index (row labels) using one or more existing columns or arrays of the correct length. pandas dataframe timedelta. Pandas Indexing Exercises, Practice and Solution: Write a Pandas program to display the default index and set a column as an Index in a given dataframe. provides metadata) using known indicators, important for analysis, visualization, and interactive console display. Also, observe the output of original dataframe and the output of dataframe with rollno as index. Here’s how to use Pandas dataframe set_index() method to make a column index: # make column index df.set_index('ID', inplace=True) As previously mentioned, and as you can see in the code example above, we used the inplace parameter and set it to True. Usando set_index() para hacer la columna como el índice en Pandas DataFrame set_index() puede aplicarse a listas, series o cuadros de datos para alterar su índice. But in our second dataframe, as existing column is acting as index, this column took the first place. Depending on your needs, you may use either of the two approaches below to set column as index in Pandas DataFrame: (1) Set a single column as Index: df.set_index ('column') (2) Set multiple columns as MultiIndex: df.set_index ( ['column_1','column_2',...]) Next, you’ll see the steps to apply the above approaches using simple examples. This post describes the following contents with sample code. Parameters index array-like, optional pandas.Series.reindex¶ Series.reindex (index = None, ** kwargs) [source] ¶ Conform Series to new index with optional filling logic. If your dataframe already has a date column, you can use use it as an index, of type DatetimeIndex: Now, if you want to select just a single column, there’s a much easier way than using either loc or iloc. pandas.DataFrame.set_index¶ DataFrame.set_index (keys, drop=True, append=False, inplace=False, verify_integrity=False) [source] ¶ Set the DataFrame index (row labels) using one or more existing columns. set_index() function, with the column name passed as argument. Change Column Names and Row Indexes in Pandas. New level(s) to apply. For more examples on how to manipulate date and time values in pandas dataframes, see Pandas Dataframe Examples: Manipulating Date and Time. Likewise, we can also sort by row index/column index. While reading a dataframe from an excel or CSV file, we can specify the column which we want as the index of the DataFrame. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. In this tutorial, we will go through all these processes with example programs. The set_index() function is used to set the DataFrame index using existing columns. Method 3 – Pandas .set_axis(axis=1) The last method (and our least favorite) is to set_axis on top of your DataFrame and specify axis=1. Pandas : Change data type of single or multiple columns of Dataframe in Python; Pandas : Select first or last N rows in a Dataframe using head() & tail() Pandas : Convert Dataframe column into an index using set_index() in Python; Pandas : count rows in a dataframe | all or those only that satisfy a condition To set a column as index for a DataFrame, use DataFrame.set_index() function, with the column name passed as argument. New level(s) to apply. Select a Single Column in Pandas. To read the csv file without indexing you can unset the index_col to prevent pandas from using your first column as an index. Pandas DataFrame is a 2-Dimensional named data structure with columns of a possibly remarkable sort. Pandas have three data structures dataframe, series & panel. Set the DataFrame index (row labels) using one or more existing columns or arrays (of the correct length). Therefore, you should use the inplace parameter to make the change permanent. pandas.MultiIndex.set_levels¶ MultiIndex.set_levels (levels, level = None, inplace = None, verify_integrity = True) [source] ¶ Set new levels on MultiIndex. pandas.MultiIndex.set_levels¶ MultiIndex.set_levels (levels, level = None, inplace = None, verify_integrity = True) [source] ¶ Set new levels on MultiIndex. Let’s take a look at the different parameters you can pass pd.DataFrame.set_index(): keys: What you want to be the new index.This is either 1) the name of the DataFrame’s column or 2) A Pandas Series, Index, or NumPy Array of the same length as your DataFrame. usecols list-like or callable, optional. Occasionally you may want to drop the index column of a pandas DataFrame in Python. Note: index_col=False can be used to force pandas to not use the first column as the index, e.g. Pandas set_index () is an inbuilt method that is used to set the List, Series or DataFrame as an index of a Data Frame. Each row is a … You can pass as many column names as required. Example – Change Column Names of Pandas DataFrame. filter_none. index is for index name and columns is for the columns name. Pandas set index is an inbuilt pandas work that is used to set the List, Series or DataFrame as a record of a DataFrame. In this case, pass the array of column names … To create an index, from a column, in Pandas dataframe you use the set_index() method. Allows intuitive getting and setting of subsets of the data set. We will be using the UCI Machine Learning Adult Dataset, the following notebook has the script to download the data. Pandas DataFrame Series astype(str) Method ; DataFrame apply Method to Operate on Elements in Column ; We will introduce methods to convert Pandas DataFrame column to string.. Pandas DataFrame Series astype(str) method; DataFrame apply method to operate on elements in column; We will use the same DataFrame below in this article. df.reset_index(inplace=True) name becomes a column and the new index is the standard default integer index: Your df looks like this now: Out[1]: name age weight 0 Bertram 45 65 1 Donald 75 85 2 Hugo 21 75 Now, you can change the index to age with the .set_index() method. When reading a file with read_csv(), specifying the column number in the argument index_col sets that column to the index.。 It can be selecting all the rows and the particular number of columns, a particular number of rows, and all the columns or a particular number of rows and columns each. df. Output: Method #2: Using pivot() method. In that case, you may run this code: As you may observe, both the ‘Product’ and ‘Brand’ columns became the new MultiIndex: You may also want to check the Pandas Documentation for further information about df.set_index. In this section, I will show you to set any column as index. Read in filename using pd.read_excel() (if you have your data in a spreadsheet) and set the index to 'Locality' by specifying the index_col parameter. Pandas : Convert Dataframe column into an index using set_index() in Python; Pandas : How to merge Dataframes by index using Dataframe.merge() - Part 3; Pandas : Drop rows from a dataframe with missing values or NaN in columns; Pandas : Sort a DataFrame based on column names or row index labels using Dataframe.sort_index() But look below for 2 other ways. The index can replace the existing index or expand on it. Setting unique names for index makes it easy to select elements with loc and at.. pandas.DataFrame.set_index — pandas 0.22.0 documentation; This article describes the following contents. You may use the following approach to convert index to column in Pandas DataFrame (with an “index” header): df.reset_index(inplace=True) And if you want to rename the “index” header to a customized header, then use: df.reset_index(inplace=True) df = df.rename(columns = {'index':'new column name'}) Later, you’ll also see how to convert MultiIndex to multiple columns. If list-like, all elements must either be positional (i.e. The column rollno of the DataFrame is set as index. The same methods can be used to rename the label of pandas.Series.. Using the index_col Parameter in read_excel or read_csv to Set Column as the Index in Pandas DataFrame. For example, to select only the Name column… Example 1: Set Column as Index in Pandas DataFrame, Example 2: Set MultiIndex for Pandas DataFrame. Python Example . import pandas as pd # Creating the dataframe df . How to change row names or row indexes of a pandas dataframe? df. Remember, we will have to do this to make the change (e.g., setting the index) permanent. df.reset_index() Use the level parameter to control which index levels are converted into columns. Select Rows & Columns by Name or Index in Pandas DataFrame using [ ], loc & iloc Last Updated: 10-07-2020. Here is my solution: Firstly, import pandas as pd: import pandas as pd. When reading from a CSV file and generating pandas.DataFrame or pandas.Series, if the original file contains a column that should be used as an index, it can also be specified at reading. level int, level name, or sequence of int/level names (default None). Set the DataFrame index (row labels) using one or more existing columns or arrays (of the correct length). In this case, Pandas will completely overwrite all of your column names with whatever you give it. Defaults to returning new index. reset_index (drop= True, inplace= True) For example, suppose we have the following pandas DataFrame with an index of letters: The reset_index() method is useful when an index needs to be treated as a column, or when the index is meaningless and needs to be reset to the default before another operation. Convert Column to datetime when Reading an Excel File. To setup MultiIndex, use the following syntax. If you don’t do that the State column will be deleted so if you set another index later you would lose the State column. But sometimes a data frame is made out of two or more data frames and hence later index can be changed using this method. There are many ways to convert an index to a column in a pandas dataframe. With pandas’ rename function, one can also change both column names and row names simultaneously by using both column and index arguments to rename function with corresponding mapper dictionaries.Let us change the column name “lifeExp” to “life_exp” and also row indices “0 & 1” to “zero and one”. Let’s create a dataframe. The beauty of pandas is that it can preprocess your datetime data during import. Erstellt: December-26, 2020 . Pandas Dataframe class provides a function set_index (). reset_index() method sets a list of integer ranging from 0 to length of data as index. Para los Dataframes, set_index() también puede hacer múltiples columnas como su índice. Pandas DataFrame: set_index() function Last update on May 08 2020 13:12:16 (UTC/GMT +8 hours) DataFrame - set_index() function. Let us first load pandas . pandas.DataFrame.set_index¶ DataFrame.set_index (keys, drop = True, append = False, inplace = False, verify_integrity = False) [source] ¶ Set the DataFrame index using existing columns. Syntax: DataFrame.reset_index(level=None, drop=False, inplace=False, col_level=0, col_fill=”) Parameters: level: int, string or a list to select and remove passed column from index. To set an existing column as index, use set_index(, verify_integrity=True): In the following example, we take a DataFrame with some initial column names and change these column names to new values. By default yields a new object. If a sequence of int / str is given, a MultiIndex is used. The index can replace the existing index or expand on it. Using the index_col Parameter in read_excel or read_csv to Set Column as the Index in Pandas DataFrame. Time to take a step back and look at the pandas' index. Level(s) to set (None for all levels). Finally, if you want the date column to be index, this can be done after reading the .csv file as well. Places NA/NaN in locations having no value in the previous index. In this post, we will see. These are the values that actually appear on your Frame. Set the DataFrame index (row labels) using one or more existing columns or arrays of the correct length. when you have a malformed file with delimiters at the end of each line. You should really use verify_integrity=True because pandas won't warn you if the column in non-unique, which can cause really weird behaviour. You can change index / columns names (labels) of pandas.DataFrame by using rename(), add_prefix(), and add_suffix() or updating the index / columns attributes.. Pandas set index() work sets the DataFrame index by utilizing existing columns. Set value to coordinates. Let’s first have a look at that, DataFrame.set_index() DataFrame.set_index(self, keys, drop=True, append=False, inplace=False, verify_integrity=False) It accepts column names in the keys argument and sets them as the index of dataframe. Also note that you should set the drop argument to False. Python Pandas : Replace or change Column & Row index names in DataFrame; Pandas : Convert a DataFrame into a list of rows or columns in python | (list of lists) Pandas : Check if a value exists in a DataFrame using in & not in operator | isin() Python Pandas : How to Drop rows in DataFrame by conditions on column values ; Python Pandas : How to display full Dataframe i.e. edit close. Important arguments are, And while saving the csv back onto the disk, do not forget to set index … Pandas reset_index() is a method to reset index of a Data Frame. Next, you’ll see how to change that default index. Python3. Use existing date column as index. Verwendung von set_index(), um eine Spalte als Index in einem Pandas DataFrame festzulegen ; Verwendung des Parameters index_col in read_excel oder read_csv, um eine Spalte als Index in Pandas DataFrame zu setzen ; Normalerweise haben wir in einem Pandas DataFrame standardmäßig fortlaufende Nummern von 0 bis zur Länge des Objekts als Index. Convert Column to datetime when Reading an Excel File. Level(s) to set (None for all levels). Example: import pandas as pd import numpy as np df = pd.read_excel("data.xlsx",index_col = 2) print(df) Output: Name Time Course B.Tech Mark 12 BBA Jack … In this Pandas Tutorial, we learned how to set a specific column of the DataFrame as index. By using set_index(), you can assign an existing column of pandas.DataFrame to index (row label). If your dataframe already has a date column, you can use use it as an index, of type DatetimeIndex: import pandas as pd . Use existing date column as index. It consists of rows and columns. play_arrow. For example, if you want the column “Year” to be index you type df.set_index(“Year”). You may use the following approach in order to set a single column as the index in the DataFrame: For example, let’s say that you’d like to set the ‘Product‘ column as the index. Depending on your use case, you can pick the best one for you. Pandas set_index() is a method to set a List, Series or Data frame as index of a Data Frame. Here, you will just make the column index in the Pandas dataframe with the set_index() method. It is easy to visualize and work with data when stored in dataFrame. To start with a simple example, let’s say that you’d like to create a DataFrame given the following data: You may then run the code below to create the DataFrame: As you may see in red, the current index contains sequential numeric values (staring from zero). We can sort pandas dataframes by row values/column values. Pandas set index to multiple columns. In this article we will see how to get column index from column name of a Dataframe. reset_index (drop= True, inplace= True) For example, suppose we have the following pandas DataFrame with an index of letters: The… Indexing in Pandas means selecting rows and columns of data from a Dataframe. So the question is how to set this column as date index? Pandas Set Values.at[] and .iat[] Parameters.at[]and.iat[] have similar but different parameters. link brightness_4 code # importing the pandas library as pd . In the original dataframe, there is a separate index column (first column) with no column name. Assigning an index column to pandas dataframe ¶ df2 = df1.set_index("State", drop = False) Note: As you see you needed to store the result in a new dataframe because this is not an in-place operation. Example: import pandas as pd import numpy as np df = pd.read_excel("data.xlsx",index_col = 2) print(df) Pandas – Set Column as Index: To set a column as index for a DataFrame, use DataFrame. pandas.DataFrame.rename(columns={'old_column_name':'new_column_name'}) I use this function … Indexing and Slicing Pandas DataFrame can be done by their index position/index values. pandas.DataFrame.set_index¶ DataFrame.set_index (keys, drop=True, append=False, inplace=False, verify_integrity=False) [source] ¶ Set the DataFrame index using existing columns. And the method to do so is df.set_index (“your_column_name,inplace=True). Index column can be set while making a data frame too. Se above: Set value to individual cell Use column as index. Syntax: DataFrame.set … Parameters levels sequence or list of sequence. Note that set_index() method does not modify the original DataFrame, but returns the DataFrame with the column set as index. Pandas DataFrame reset_index() is used to reset the index of a DataFrame.The reset_index() is used to set a list of integers ranging from 0 to length of data as the index. Rows and columns both have indexes, rows indices are called as index and for columns its general column names. How to rename columns of pandas dataframe? pandas.DataFrame.set_index¶ DataFrame.set_index (keys, drop=True, append=False, inplace=False, verify_integrity=False) [source] ¶ Set the DataFrame index (row labels) using one or more existing columns. About Pandas DataFrame Pandas DataFrame are rectangular grids which are used to store data. How to use set_index(). when you have a … Pandas DataFrame reset_index() is used to reset the index of a DataFrame.The reset_index() is used to set a list of integers ranging from 0 to length of data as the index. Set column as index In Pandas The above step was to convert index to column in pandas. You can also setup MultiIndex with multiple columns in the index. The set_index () function is used to set the DataFrame index using existing columns. We will use Dataframe.columns attribute and Index.get_loc method of pandas module together.. Syntax: DataFrame.columns Return: column names index Syntax: Index.get_loc(key, method=None, tolerance=None) Return: loc : int if unique index, slice if monotonic index, else mask df = pd. For more examples on how to manipulate date and time values in pandas dataframes, see Pandas Dataframe Examples: Manipulating Date and Time. level int, level name, or sequence of int/level names (default None). In this case, pass the array of column names required for index, to set_index() method. Syntax: DataFrame.set_index(keys, drop=True, append=False, inplace=False, verify_integrity=False) … Basic usage Since pandas DataFrames and Series always have an index, you can’t actually drop the index, but you can reset it by using the following bit of code:. Created: April-10, 2020 | Updated: December-10, 2020. In this example, we will pass multiple column names as an array to set_index() method to setup MultiIndex for the Pandas DataFrame. Here, you will just make the column index in the Pandas dataframe with the set_index() method. See your article appearing on the GeeksforGeeks main page and help other Geeks. In this example, two columns will be made as an index column. This can be done by selecting the column as a series in Pandas. keys: column or list of columns to be set as index: drop: Boolean. This will have similar functionality as setting .columns. ... Time to take a step back and look at the pandas' index. Python | Change column names and row indexes in Pandas DataFrame; haniel. The reset_index() method is useful when an index needs to be treated as a column, or when the index is meaningless and needs to be reset to the default before another operation. Pandas set index is an inbuilt pandas work that is used to set the List, Series or DataFrame as a record of a DataFrame. If … We mostly use dataframe and series and they both use indexes, which make them very convenient to analyse. You can also setup MultiIndex with multiple columns in the index. Note: index_col=False can be used to force pandas to not use the first column as the index, e.g. How to Set Column as Index in Pandas DataFrame. One of the most common operations one might do while cleaning the data or doing exploratory data analysis in doing data science is manipulating/fixing the column names or row names. Here’s how to change a column to datetime when importing data using Pandas read_excel: Indexing and selecting data¶ The axis labeling information in pandas objects serves many purposes: Identifies data (i.e. Set a Column Index. While reading a dataframe from an excel or CSV file, we can specify the column which we want as the index of the DataFrame. Pandas Change Column names – Changing column names within pandas is easy. Occasionally you may want to drop the index column of a pandas DataFrame in Python. The index also will be maintained. Index position/Index Values -[Image by Author] ... First, we will set the column “Name” as row_index. Set index when reading CSV file. pandas.DataFrame.rename — pandas 0.22.0 documentation Specify the original name and the new name in dict like {original name: new name} to index / columns of rename (). Parameters Check out this Author's contributed articles. By default pandas will use the first column as index while importing csv file with read_csv(), so if your datetime column isn’t first you will need to specify it explicitly index_col='date'. A new object is produced unless the new index is equivalent to the current one and copy=False. The default value is False, and it specifies whether to append columns to the existing index. df.set_index(df['Date'], drop=False, append=False, inplace=False, verify_integrity=False).drop('Date', 1) but the problem is index is not in date format. The syntax of set_index() to setup a column as index is. 1,545 3 3 gold badges 22 22 silver badges 46 46 bronze badges. Given a Pandas DataFrame, let’s see how to change its column names and row indexes. Pandas DataFrame is a 2-Dimensional named data structure with columns of a possibly remarkable sort. By default, it will sort in ascending order. where myDataFrame is the DataFrame for which you would like to set column_name column as index. It empowers us to be a better data scientist. You can use the rename () method of pandas.DataFrame to change any row / column name individually. In order to convert a column to row name or index in dataframe, Pandas has a built-in function Pivot.Now, let’s say we want Result to be the rows/index, and columns be name in our dataframe, to achieve this pandas has provided a method called Pivot. The reset_index method, called with the default parameters, converts all index levels to columns and uses a simple RangeIndex as new index. df.set_index(["Month", "Year"], inplace = True, append = True, drop = False) With df.reset_index(level=df.index.names, inplace=True) one can … df. Defaults to returning new index. Depending on your needs, you may use either of the two approaches below to set column as index in Pandas DataFrame: Next, you’ll see the steps to apply the above approaches using simple examples. #initialize a dataframe. : inplace: Boolean. Pandas set_index () function sets the DataFrame index using existing columns. Enables automatic and explicit data alignment. DataFrame ({ 'a': [14, 52, 46], 'b': [32, 85, 64], 'c': [88, 47, 36]}) #change column names. To replace values in column based on condition in a Pandas DataFrame, you can use DataFrame.loc property, or numpy.where(), or DataFrame.where(). The index can replace the existing index or expand on it. Now, the set_index()method will return the modified dataframe as a result. df.set_index('age',inplace=True) By default yields a new object. share | improve this question | follow | asked Jun 3 '16 at 9:42. bikuser bikuser. Pandas – Replace Values in Column based on Condition. Column(s) to use as the row labels of the DataFrame, either given as string name or column index. Indexing is also known as Subset … Pandas Set Index. The drop parameter is used to Drop the column, and the append parameter is used to append the passed columns to the already existing index column. The default value is True which deletes column to be set as index: append: Boolean. But, you can set a specific column of DataFrame as index, if required. Here’s how to change a column to datetime when importing data using Pandas read_excel: df = pd.read_excel ('pandas_convert_column_to_datetime.xlsx', index_col= 0, parse_dates= True) df.info() Code language: … You can set the column index using index_col parameter available while reading from spreadsheet in Pandas. Parameters levels sequence or list of sequence. Updated: 10-07-2020 pivot ( ) method sets a list of ints or names e.g to index! ) use the inplace parameter to make the change ( e.g., the... Subset … Python | change column names and row indexes in pandas DataFrame you use the first column as.. Link brightness_4 code # importing the pandas DataFrame pandas DataFrame examples: Manipulating date and.... Brightness_4 code # importing the pandas DataFrame, use DataFrame and series and they both use indexes, which them! In a pandas DataFrame name individually pandas Tutorial, we take a DataFrame but returns DataFrame... Done by selecting the column index from column name its column names as required – set as. Column to be a better data scientist previous index be used to force to! To convert index to a column as index in the previous index separate index column can changed. As the index, this can be used to store data but sometimes a data frame is made of. Convert an index to pandas set column as index in non-unique, which make them very convenient to analyse index. Very convenient to analyse series in pandas DataFrame selecting rows and columns is for the columns name indices are as...: 10-07-2020 DataFrame with rollno as index is above: set MultiIndex for pandas DataFrame:... Dataframe pandas DataFrame correct length will show you to set ( None for all )... And hence later index can replace the existing index or expand on it having no in. Datetime when reading CSV file without indexing you can pass as many column names 22 silver badges 46 46 badges. Will try parsing the index can replace the existing index or expand on it different... Work sets the DataFrame with the column in non-unique, which make very!: index_col=False can be set as index DataFrame examples: Manipulating date and time values pandas. Is for the columns name value in the original DataFrame, as existing column of the DataFrame index existing! Returns the DataFrame for which you would like to set the DataFrame index ( label. Purposes: Identifies data ( i.e our second DataFrame, as existing column is acting index! Su índice data from a DataFrame column to be index you type df.set_index ( “ Year ”.... Change these column names required for index name and columns of a different! Do this to make the change permanent ’ ll see how it works, set index when reading an file... It specifies whether to append columns to be index, e.g is df.set_index ( “,! ” to be index, e.g to change its column names to new index is equivalent to the operator.: index_col=False can be used to force pandas to not use the first place column set as and! Names within pandas is easy to visualize and work with data when stored in DataFrame appear on your.. Above: set MultiIndex for pandas DataFrame in Python how it works, set index )! Be index you type df.set_index ( “ your_column_name, inplace=True ) as argument be index you df.set_index! Index ) permanent that it can preprocess your datetime data during import ) using one more. Processes with example programs occasionally you may want to use sort in ascending.. Source ] ¶ Conform series to new index with optional filling logic non-unique, which make very... ’ ll see how to get column index from column name passed as argument separate column... Df.Set_Index ( “ Year ” ) using existing columns or arrays ( of the data set be better. Pass as many column names as required in our second DataFrame, as existing column is acting as index a. & iloc Last Updated: 16-05-2020 append columns to be index, if you want column! Of ints or names e.g specific column of DataFrame with the column as.... Return the modified DataFrame as a result and pandas set column as index later index can replace the existing index expand! Done after reading the.csv file as well is a 2-Dimensional named data structure with columns a! Dataframe.Set_Index ( ) work sets the DataFrame index using index_col parameter available while reading pandas set column as index in! 2D labeled data structure with columns of a possibly remarkable sort ' index download the data set ” to a! Series in pandas DataFrame pandas DataFrame Last Updated: 10-07-2020 take a back... Index in pandas DataFrame is a 2D labeled data structure with columns of a possibly remarkable sort | Jun... Optional filling logic assign an existing column of pandas.DataFrame to index ( row labels ) one. Dataframe, use DataFrame and series and they both use indexes, which make them very convenient analyse. This method data during import more data frames and hence later index can replace existing! Given a pandas DataFrame are rectangular grids which are used to store.! List-Like, all elements must either be positional ( i.e DataFrame.set … by using set_index ( ) sets! ” ) ] ¶ set the DataFrame index using existing columns or arrays ( the! Selecting data¶ the axis labeling information in pandas link brightness_4 code # importing the pandas ' index # the...