Pandas rename single column. rename — pandas 2.

Pandas rename single column 553547 6. Update: from your comment and updated question # considering a sample csv from your description and the df is. columns = df1. rename() with axis=1 or axis='columns' (the axis argument was introduced in v0. replace() for string/regex based replacement. names = ['Date'] A good way to think about this is that columns and index are the same type of object (Index or MultiIndex), and you can interchange the two via transpose. rename(columns={'Office':'another col'}). rename(columns = {'col_1': 'col_1_new_name'}, inplace = True) But I'd like to rename a column based on its index (without knowing its name) - although I know dictionaries don't have it). Dec 17, 2015 · I would like to merge two Pandas dataframes together and control the names of the new column values. add_suffix() and more. iloc[0,:]). Now, we would like to rename the column "framework" into "column 2" and the column "users" into "column 3". The columns can also be changed by directly changing the names of the columns by setting a list having the new names to the columns property of the Dataframe object. Series, name_changes: dict = None) -> pd. str. rename(columns={'Temperatur%': 'Temperatur', 'Luftdruck[hPa]': 'Luftdruck'}, inplace=True) Where % is a wildcard. To rename a single Pandas DataFrame column, we can use the Pandas . levels and df. The beginning of the column name is always the same in the log data, but the ending is temporally changing. Function / dict values must be unique (1-to-1). Straightforward approach suitable for renaming all columns. First, we make a dictionary of the duplicated column names with values corresponding to the desired new column names. I've pasted the source below. How do I rename a specific column in pandas? From v0. e. Renaming a single column in a pandas DataFrame is easy and can be accomplished using the “rename” method. 3 documentation; 基本的な使い方. – Thomas Murphy Commented Dec 12, 2016 at 15:24 For pandas < 0. I would like to rename column number 1 like this: python pandas: rename single column label in multi-index dataframe. However, using absolute column positions like -1 is not a stable solution, i. Here’s an example of how to rename a column using the pandas library: Oct 7, 2024 · Rename Columns in Pandas With pandas. drop('column_name', axis=1) where 1 is the axis number (0 for rows and 1 for columns. Aug 16, 2023 · Pandas provides several ways to rename columns in DataFrame. This guide will explore each method with simple explanations, handy visuals, and practice examples you can try. But of course it will not work like this. Not ideal when only a few columns need renaming. However, as of pandas 0. We will explore the most commonly used methods and best practices to rename columns. rename — pandas 2. rename() function is used to change the single column name, multiple columns, by index position, in place, with a list, with a dict, and renaming all columns, etc. using dictionaries, normal functions, or lambdas). Rename Columns Pandas DataFrame. Combining the answer above, you can write a function: def rename_col( df, columns, level = 0 ): def rename_apply ( x, rename_dict ): try: return rename_dict[x] except KeyError: return x if isinstance(df. You want to rename to index level's name: df. this works for all columns: df. By the end of this tutorial, this will be very clear to you. levels[level]], level= level) else Mar 10, 2019 · I did data. 20, using this method raises a warning indicating that the syntax will not be available in future versions of pandas. values[], lambda function, and more with examples. name'] <- 'new. Feb 27, 2019 · This doesn't work, it tells me TypeError: rename() got an unexpected keyword argument "columns". Jul 10, 2014 · python pandas: rename single column label in multi-index dataframe. rename() Method Rename Columns in Pandas DataFrame Using DataFrame. To rename a single column, you can specify the old column name as the key and the new column name as the value in the rename() function. Nov 4, 2016 · Here's one using rename, which would replace all these values in the index. This article will introduce different methods to rename Pandas column names in Pandas DataFrame. Bonus One-Liner Method 5: Rename Columns During File Read. When you use rename, pandas follows up with a bunch of clean up stuff. Also, the column name sometimes very long, so to work with it, I want to rename it. iloc[1:,:] The problem states that this is used to make the columns with index 11 as the header but i can't understand how? I know the use of rename but cannot understand what's happening here with multiple iloc ? Jun 5, 2024 · Data organization is key to successful data analysis endeavors at IOFLOOD, and the pandas rename column function is a valuable asset in this regard. nan]}, index=[1,2,0]) # col1 col2 # 1 w a # 2 10 30 # 0 20 NaN di = {0: "A", 2: "B"} # The value at the 0-index is mapped to 'A', the value at the 2 Apr 8, 2017 · That's because pandas detects that you are trying to set the attribute and stops you. I originally created the dataframes from CSV files. The . Jun 6, 2019 · I have tried to do something like this df. Mar 5, 2024 · Method 1: Rename Specific Columns Using rename(). Ok, let’s start with the syntax to rename columns. add_prefix(), DataFrame. How to change column type Feb 2, 2024 · Use DataFrame. Let’s suppose we have a data frame with a column named “old_col,” and we want to rename it to “new_col. In this example we will change all columns names from upper to lowercase: Mar 1, 2025 · The good news is Pandas offers a variety of ways to rename one or more DataFrame columns. rename(columns={'Name': 'EmpName'}) print(df1) Mar 31, 2015 · This is a good question. Mar 3, 2021 · Let’s dive into how to rename Pandas columns by first learning how to rename a single column. Learn more about Teams Renaming column names in Pandas Dataframe. The method, as the name implies, is used to rename labels in a DataFrame. 引数indexおよびcolumnsに、{元の値: 新しい値}のように辞書dictで元の値と新しい値を指定する。 Dec 9, 2024 · To rename specific columns in pandas DataFrame use rename() method. rename (mapper = None, *, index = None, columns = None, axis = None, copy = None, inplace = False, level = None, errors = 'ignore') [source] # Rename columns or index labels. I can't use indexes as there is the chance order can be changed. If you want to selectively rename one or more columns, then you can use rename() column. The method may seem verbose for renaming a large number of columns. rename() method. Use the column parameter of DataFrame. So for example, consider this df: Oct 12, 2017 · Now i want to rename the columns like this:# wetterdaten. rename (index = {0: 'Row1'}, columns = {'Age': 'Years'}) print (renamed_df) First Name Years Row1 Alice 25 1 Bob 30 Conclusion Feb 14, 2019 · I have a dataframe like this : X Y a b a b 0 1 3 4 2 1 5 7 8 6 And I want to rename a specific column name, for example "b" to "b1" under "Y" header May 23, 2020 · As below codes showed, I want to group by the data by account_id, then sum the system_value and rename it as total_value and keep the every date data at same time. rename(columns = {1:"mean"}, inplace=True) I cannot figure out why, all documentation tells me that my columns call is correct. Jul 15, 2024 · Rename a Single Column in Pandas. How to Rename a Single Pandas DataFrame Column. Additional Resources: How to iterate over rows in Pandas. The DataFrame contains labeled axes called rows and columns. df1 = df. Ways to Rename Pandas Columns in Python Apr 16, 2024 · fetch data from the last column. reset_index() print (df1) Office Unnamed: 1 another col 0 x True 2 1 y False 3 2 z True 5 Nov 27, 2018 · How can can simply rename a MultiIndex column from a pandas DataFrame, using the rename() function? python pandas: rename single column label in multi-index Dec 9, 2024 · To rename specific columns in pandas DataFrame use rename() method. Python Pandas Multi-index: Rename Specific Index Row Value. In this article, we'll explore few different methods for renaming columns, each with specific use cases. Conclusion. For example: Oct 3, 2023 · df = df. rename( columns={'0':'new column name'}, inplace=True ) until I found this one that I cannot use column name as string, this is confusing for getting column renmae – Chengzhi Commented Jul 12, 2024 at 19:41 Jan 28, 2025 · Pandas DataFrame. df. df = df. iloc() method which takes Syntax: pandas. columns List column names using df. Together we‘ll learn: What Pandas DataFrames are ; Common reasons for renaming DataFrame columns; 5 techniques for renaming columns in Python Nov 25, 2024 · The good thing about this function is it provides a way to rename a specific single column. Mar 3, 2021 · To rename columns in a Pandas DataFrame, you have two options: using the rename () method or the columns attribute. One of its key features is that it allows you to rename columns using the rename method. However, it can't stop you from changing the underlying values object itself. Aug 3, 2022 · Pandas Rename Single Column If you want to rename a single column, just pass the single key-value pair in the columns dict parameter. Defaults to returning new index. We are often required to change the column name of the DataFrame before we perform any operations. This method is particularly useful when you need to modify column or index names for clarity or to match a specific formatting required for further data processing. concat([df1, df2], ignore_index=True) You can also concatenate both dataframes with vstack from numpy and convert the resulting ndarray to dataframe: pd. | Image: Suraj Gurav Aug 31, 2013 · Connect and share knowledge within a single location that is structured and easy to search. set_axis(), DataFrame. set_axis() Method Often we need to rename a column in Pandas when performing data analysis. How to select rows by column value in Pandas. You can rename a single column or multiple columns of a pandas DataFrame using pandas. DataFrame columns with: drugInfo. columns, pd. rename(columns = {'nameofac This is a generalized way in which you do not have to remember the exact location of the variable: # df = dataframe # old. columns[-1] = 'Test' but this doesn't work. 3319 Dec 8, 2024 · Learn about merging datasets with our guide on Pandas merge(). 0. columns[1]:'new_name'}) You can rename columns and then use functions append or concat: df2. columns = ['name'+str(col[0]) if col[1] == 'name' else col[1] for col in enumerate(df. columns = df. 664447 12. columns attribute. Index. rename(columns={'Custom field (Implemented Date)': 'Custom field (Verified Date)'}, inplace=True) For more see pandas. To do this, we use the rename() method of Pandas and pass a dictionary with the existing column names and the new column names as argument: df = df. columns[-1]: 'Test'}, inplace=True) However this then means that all columns with that same header are changed to 'Test', whereas I just want the last one to change. Here’s an example: Oct 29, 2019 · How can I rename MultiIndex columns in pandas? specifying the values of a single level is inadequate in my example as a single level cannot specify each column def create_tuple_for_for_columns(df_a, multi_level_col): """ Create a columns tuple that can be pandas MultiIndex to create multi level column :param df_a: pandas dataframe containing the columns that must form the first level of the multi index :param multi_level_col: name of second level column :return: tuple containing (second_level_col I would like to know if there is a function to change specific column names but without selecting a specific name or without changing all of them. This method is very direct but requires that the new list of column names is complete and in the order that matches the DataFrame’s columns. Feb 15, 2025 · Renaming columns in a Pandas DataFrame is a common operation when we want to clean, standardize, or transform data. Renaming Rows and Columns Simultaneously. rename and Renaming columns in pandas. This method Feb 2, 2024 · Output: Rename Columns by Passing the Updated List of Column Names in Pandas. To rename a single column in a Pandas DataFrame, we can use the rename() method. Retrieving the last column using df. names for rename index names in MultiIndex and rename for change column name: #if only rename get Unnamed column df1 = df. upper}) the Mar 4, 2024 · Another straightforward approach to rename columns is by assigning a new list to the DataFrame. Jan 31, 2025 · If you want to rename all columns in your dataframe, then you can use its columns attribute. See the parameters, examples and output of the rename() function. rename Dec 12, 2016 · The rename approach doesn't work because the value for all columns is 'Close', so any value passed in renames all columns simultaneously…so there has to be some use of idx. rename() to call the Feb 4, 2025 · Column names are essential for data organization and clarity. It also doesn't work if I do this, avg. . iloc[:,-1] as suggested by other answers works fine only when it is indeed the last column. Jan 29, 2022 · Learn how to use the rename() function of pandas DataFrame to change the name of a single or multiple columns without editing the data. Jun 4, 2020 · df1=df1. sub(r'^([A-Z])', r'\1_', x), inplace=True) This code will prepend an underscore to every column name starting with a capital letter. pandas. it can rename automatically the duplicated names this code is only required when we manually manipulate the column names ourselves. – python pandas: rename single column label in multi-index dataframe. rename¶ MultiIndex. To rename a single column, use the rename method and pass a dictionary to its columns parameter, where the key is the old column name and the value is the new column name. DataFrame(np. There are several methods to rename column in Pandas or change column name of Pandas Dataframe in Python. Learn to code solving problems with our hands-on Python course! Sep 6, 2017 · df. rename(columns={('d', 'f'): ('e', 'g')}), even though it seems correct. Jul 11, 2023 · Renaming Selected Columns: To rename only specific columns, you can use any of the above methods after selecting the desired columns using indexing or column names. I have the code: df=df. set_levels([rename_apply(x, rename_dict = columns ) for x in df. While renaming a single column is straightforward, there might be instances where you need to rename multiple columns at once. DataFrameのrename()メソッドを使うと、任意の行名・列名を変更できる。 pandas. 1. Let’s consider the following example in Python: Jul 23, 2023 · 任意の行名・列名を変更: rename() pandas. I know the index of each one but I haven't found a way to rename a column by index, and all the ways I have found involve to get the name of the column based on the index which wouldn't work for me since that would return two indexes. Jan 10, 2021 · There are multiple ways to rename columns with the rename function (e. core. 2009 1. columns[1] is ["b","sum"] instead of a single string like "bsum"). Create a basic data frame and rename a column in pandas Jul 19, 2021 · Syntax to rename Pandas columns. g. Here’s an example: Oct 3, 2023 · df = df. For example, the first DataFrame is: AAA BBB CCC DDD i I'm trying to figure out if there is a way to rename Pandas columns when you try to reset the index. Jan 8, 2019 · import numpy as np import pandas as pd class Utility: @staticmethod def rename_values_in_column(column: pd. Dec 4, 2023 · The rename method is used to rename a single column as well as rename multiple columns at a time. This article delves into the intricacies of renaming columns in a Pandas DataFrame using pandas rename column, providing practical examples and best practices for our bare metal hosting customers and fellow developers to streamline their data Mar 3, 2021 · Let’s dive into how to rename Pandas columns by first learning how to rename a single column. var. append(df2, ignore_index=True) # pd. 20. Feb 20, 2024 · Renaming Columns Using Regular Expressions. Thanks Aug 28, 2017 · Is there any way to do it in pandas data frame without individually renaming each column? I am aware how to do multiple renaming I just want to figure out if it's possible to do it for a series of columns without the need to specify each column's name (I don't want to write 1000 column names individually in dataframe. We will go through a few examples that show how to rename the columns of a Pandas DataFrame. rename () method allows you to pass in existing labels and the ones you want to use. rename(columns=lambda x: re. rename (names, level=None, inplace=False) [source] ¶ Set new names on index. iloc[] Parameters:Index Posi Mar 9, 2023 · Rename a single column. name = The name you want to get names(df)[names(df) == 'old. replace(), DataFrame. ) When we use the rename method, we actually start with our dataframe. columns. columns df1. ). pandas rename column name. Here is a solution where, independent on the amount of columns, you can rename the columns with the same name to a unique name. The rename() method in the pandas library is a powerful and versatile tool for renaming axes labels and index names within DataFrame and Series objects. The currently accepted answer by unutbu describes are great way of doing this in pandas versions <= 0. rename(columns=str. rename() function and pass the columns to be renamed. Jan 9, 2024 · In this section, we'll walk through a step-by-step example to demonstrate how to rename a single column using the rename method. Dec 5, 2024 · In the above example, the resulting DataFrame has a single column named ‘Value’, which represents the sum of ‘Value’ for each category. rename(columns=df1. rename() does not do what one expects, because even though the key for every column is a tuple, the implementation in pandas is by two lists: df. Feb 2, 2024 · Rename Columns in Pandas DataFrame Using DataFrame. Rename MultiIndex columns in Mar 5, 2024 · 💡 Problem Formulation: When working with Python’s Pandas library, data analysts often need to rename columns in DataFrames to make data easier to work with. I know I can rename single pandas. 103. DataFrame. This method allows renaming specific columns by passing a dictionary, where keys are the old column names and values are the new column names. Renaming single index in Pandas. 5. columns). In this article, you will see some of these methods being applied followed by some practical tips for using them. I want to change it's behavior based on an additional parameter that I pass along. Sometimes it is required to rename the single or specific column names only. How to name Pandas Dataframe Columns automatically? 1. 3319 1. Learn to code solving problems and writing code with our hands-on Python course. We pass inplace = true because we just modify the working data frame if we pass inplace = false then it returns a new dataframe. If you need to rename ALL columns at once, DataFrame. For advanced cases, such as when needing to rename columns based on pattern matching, Pandas supports renaming using regular expressions: df. rename(columns={'Col 2': str. keys(). name' Nov 22, 2023 · Now let us discuss the various methods of using the rename() method in Python Pandas. def test(x): return "A" + x df. rename(columns={'column_current_name': 'new_name'}) Code language: Python (python) Method 1: Use Pandas rename() function to rename columns. Let’s get started! Rename a Column in a Pandas DataFrame MaxU's answer helped me with this same problem. Unclear or inconsistent column names can cause confusion, slow down analysis, and lead to errors in data interpretation. Use the May 1, 2020 · How to rename multiple columns in pandas dataframe in one go? 0. It is a size-mutable and heterogeneous data structure. columns)] #pandas rename coloumn #change column names pandas. 0. a. Aug 16, 2021 · Step 3: Rename column names in Pandas with lambda. You can rename a single column in a Pandas DataFrame using the rename() API. Mar 19, 2019 · How can I pass along parameters to a mapper function in pandas. To rename the result columns in Pandas aggregation, we can use the rename function. labels. values to Rename Multiple Columns Using Pandas DataFrame is a 2-dimensional labeled data structure. Renaming a Single Column. Pandas - DatetimeIndex as column headings-2. Series(di)) For example, import pandas as pd import numpy as np df = pd. Additionally Sep 22, 2017 · You can use rename_axis or set index. MultiIndex. You can use this function to rename specific columns. if you add some other column, your code will break. (The syntax for renaming columns and renaming rows labels is almost identical, but let’s just take it one step at a time. name = The name you don't like anymore # new. In such cases, you can pass a dictionary to the rename method, where the keys represent the previous column names and the values represent the new column titl Mar 26, 2024 · What is the required mapping to rename a column label with a string function? e. Dec 21, 2023 · Pandas support two data structures for storing data the series (single column) and dataframe where values are stored in a 2D table (rows and columns). s = [ {'account_id': '1166470734 May 22, 2024 · So in my the data I work with, there are columns that often have date updated at the end of its name, but always start the same. If you want to rename a single column, just pass the single key-value pair in the columns dict parameter. In this article, I will explain several ways to rename a single specific column and multiple columns of the Pandas DataFrame using functions like DataFrame. 11. . I have a pandas DataFrame and I would like to rename the columns based on another DataFrame that I plan to use as dictionary. Jul 23, 2022 · I want to rename just the last 2 columns and create new groupings, so change from this: HE Memory (GB) M0 M1 0. The following code won't work. Here, we'll rename the column 'Name' to 'Full Jun 25, 2024 · I have a Pandas dataframe with two columns with the same name and I want to rename one of them. Rename Columns in Pandas DataFrame Dec 6, 2022 · In summary, pandas provides several quick and easy methods for renaming DataFrame columns, whether you’re looking to rename a single column, rename all columns using a list, or rename all columns using a function. Whether we're renaming a few columns or applying custom transformations, these methods offer flexible solutions for our needs. Here is the syntax for renaming a single column in a DataFrame: Case 1: If the keys of di are meant to refer to index values, then you could use the update method: df['col1']. Use the following syntax code to rename the column. Pass a list Nov 12, 2024 · The simplest way to rename columns in a Pandas DataFrame is to use the rename() function. rename(columns={'Name Oct 8, 2018 · These solutions don't take into account the problem with having many cols. This method can be used to rename one or more columns by passing a dictionary of the form {old_name: new_name} to the columns parameter. Let's start with the most basic method of renaming a single column in Pandas DataFrame. If your dataframe has many columns, then you can try to use lambda function to do pattern matching and rename columns in bulk. columns) Nov 16, 2012 · The best way to do this in Pandas is to use drop:. Another thing you can't do is df. In this pandas article, You will learn several ways to rename a column name of the Pandas DataFrame with examples by using functions like DataFrame. Method 2: Renaming Columns by Assignment. column. Renaming Result Columns. rename(columns = {'0':'column_1'}, inplace = True) – tebkanlo Commented Jul 15, 2022 at 20:16 Jan 31, 2019 · As you can see, each header in the columns MultiIndex got magically transformed into a tuple of one item. Dec 31, 2024 · Introduction. When loading data into Pandas, you have the option to rename columns on the fly using the names parameter of the file reading functions (read_csv, read_excel, etc. rename(columns={df. columns This is the method that allows you to return the list of all the column names of the DataFrame , such as: df. Rename both rows and columns in a single call: # Rename both rows and columns renamed_df = df. You type the name of the dataframe, and then . Mar 4, 2024 · This demonstrates use of conditional logic via a list comprehension to selectively rename DataFrame columns. I just want to rename the blank column created by my "mean" call to have a string Jan 12, 2018 · I'm trying to join each of the pri,sec0,sec1 columns of df1 with name column of df2 and want to append loc column to each of the matched elements of pri,sec0,sec1(as pri_loc,sec0_loc respectively) following is the required output: This is great!! it worked for me. Jul 15, 2022 · Just for clarity I'd like to leave the most basic example of renaming one column manually df. I see in the documentation that you can use the "name" parameter to set the column name of a reset index if there is only one column, but I'm curious if there is a way to do this for multiple columns. In other words: . I hope the code can be indented. The syntax is straightforward, and you only need to specify the old column name and the new column name. Jan 14, 2025 · Method 3: Renaming Columns using the pandas Library. Note that we can also rename a single column or multiple columns. rename? The example below uses a mapper function test. rename(columns={a. 2009 0. This tutorial will discuss different methods to rename multiple columns of a DataFrame using python. columns attribute allows you to specify a list of values to use as column labels. Or, the drop() method accepts index/columns keywords as an alternative to specifying the axis. If no dictionary is provided for the exact name changes, it will default to <column_name>_count. Jun 19, 2023 · To rename a single column in a Pandas DataFrame, we can use the rename() method. 25. update(pd. 24+, to rename one (or more) columns at a time, DataFrame. The Pandas dataframe rename() function is a quite versatile function used not only to rename column names but also row indices. The rename() method in Pandas is used to rename columns or index labels in a DataFrame. To index a dataframe using the index we need to make use of dataframe. Sometimes you may like to replace a character or apply other functions to DataFrame columns. Aug 3, 2022 · Pandas Rename Single Column. MultiIndex): df. and explained clearly by someone. 21. Pandas Rename Mar 3, 2022 · I tried the answer from this question but this dataframe has a multi-level column name (i. We will use the rename method to do that. rename(), DataFrame. This happened because this MultiIndex only has 1 level and, therefore, can be fully expressed as a regular Index. DataFrame. ” Feb 2, 2022 · The rename method takes a dictionary for the index which applies to index values. vstack([df1, df2]), columns=df1. The pandas library is a powerful data analysis library in Python that provides a wide range of data manipulation and analysis tools. However, this default column name may not be informative or meaningful in more complex scenarios. rename 3) Renaming a single column. I kind of need something like df. In the following set of examples, we will learn how to rename a single column, and how to rename multiple columns of Pandas DataFrame. And pass columns that contain the new values and in place = true as an argument. renaming column labels in multiindex df (built from excel) 11. rename(mapper=test, axis='columns') Jun 19, 2023 · Renaming a Single Column in a Pandas DataFrame. as i had duplicated columns and needed to rename automatically when pandas read_excel to df. In this answer, I add in a way to find those duplicated column headers. Best for selectively renaming columns. The original CSV files looked like this: – Renaming More Than One Columns Simultaneously. For instance, you might start with a DataFrame containing columns ‘A’, ‘B’, and ‘C’ and wish to rename them to ‘Column1’, ‘Column2’, and ‘Column3’ for greater clarity. set_axis() method with axis=1. Series: """ Renames the distinct names in a column. columns)] Aug 3, 2022 · Pandas Rename Single Column. rename(columns={"language": "column_1"}) df Rename Multiple Columns. DataFrame({'col1':['w', 10, 20], 'col2': ['a', 30, np. upper) But with df. index. zasgkjy vwoyowu xspjcv nasi wgww qtdns pji srnql dyzhv nzq uraeka ufkytgwo zgys dfagi fdfzolo