Swap columns and rows python It is useful when we want to change orientation of our data for better readability and analysis. Method 2: The melt Function The melt() function in Pandas reshapes DataFrames from wide format to I'm new to Python and after a lot of tinkering, have managed to clean up some . Note that column-wise is the default behaviour. Any help would be appreciated. It returns transposed DataFrame by converting rows of the original DataFrame as columns and vice versa. Swap two dataframe columns Swapping two dataframe columns is like interchanging the values of two columns. Reflect the DataFrame over its main diagonal by writing rows as columns and vice-versa. Method #4 : Using values attribute to rename the columns. Row-Column Swap: Flips rows and columns, converting the index to column headers and vice versa. transpose() function is a versatile tool in Python that allows you to rearrange the axes of an array. The third utilizes the zip function with unpacking, offering a concise and elegant approach. We discussed advanced indexing, NumPy indexing, the np. transpose() function. Method #3: Using Lambda Function to rename the columns. Aug 8, 2023 · Refer to the following articles for transposing numpy. Jan 13, 2014 · Using nested lists like this: N = [['D','C','A','B'], [2,3,4,5], [6,7,8,9]] How could I swap two columns? for instance column C and column A. Change the columns into any order you want using this easy process. csv) and have them displayed swapped in the output file (the other columns are still the same). Consider the following example: Hello, I am trying to swap the values in columns 1 and 2 respectively from an input file (. With ndarray. Series(s. I need to simply swap these so that my file contains 500 rows of data and 100 columns of values. values) with pd. Learn how to swap columns of a given NumPy array using various methods such as advanced indexing, <code>numpy. With it, you can quickly switch data from columns to rows, or vice versa. Rows and columns of NumPy arrays can be selected or modified using the square-bracket indexing notation in Python. A naive solution is to loop through the array. For example, you may want to make the column names more descriptive or shift the row index labels for better readability. Having already defined the idx variable above, I can easily do this in just three more lines, by using a temporary variable as follows: pandas. column no. transpose(self, *args, **kwargs) Parameters: Jul 4, 2025 · Changing column names and row indexes in a Pandas DataFrame is a common task during data cleaning or formatting. When called with our example matrix, it produces the desired result. Download the sample workbook and enjoy learning with us! Jan 27, 2021 · I think if you just want the first and second columns swapped you should change the code to be something like this: for i in m: i[1],i[0] = i[0],i[1] Dec 4, 2018 · swap rows and columns with list comprehension Asked 6 years, 11 months ago Modified 6 years, 11 months ago Viewed 434 times If you have a worksheet with data in columns that you need to rotate to rearrange it in rows, use the Transpose feature. For instance, converting a DataFrame of user attributes with columns ‘Name’, ‘Age’, and ‘Occupation’ into a row-oriented format, making each attribute a separate row Learn how to swap columns of a given NumPy array using various methods such as advanced indexing, <code>numpy. Let's explore different methods to efficiently change column names and row indexes in a Pandas DataFrame. DataFrames are 2-dimensional data structures in pandas. Aug 11, 2023 · To swap the rows and columns of a DataFrame in Pandas, use the DataFrame's transpose (~) method. T), the ndarray method transpose() and the numpy. Feb 21, 2024 · Overview Swapping rows in a DataFrame is a common task that data scientists and analysts encounter while preprocessing data. copybool, default False Whether to copy the data after transposing Feb 24, 2024 · Introduction DataFrames are fundamentally two-dimensional data structures, commonly used in the Python Pandas library to manipulate and analyze tabular data. What's reputation and how do I get it? Instead, you can save this post to reference later. Oct 31, 2012 · df['mean'] = df. The primary method for swapping columns and rows […] Jul 11, 2025 · The task of transposing elements of a two-dimensional list in Python involves converting rows into columns and vice versa. If you want to change the values of a row Dec 28, 2023 · Problem statement Suppose that we are given a 2D numpy array that contains multiple rows (say x, y, p, and q). Feb 19, 2024 · Problem Formulation: Users of pandas, the powerful Python data manipulation library, may often face the need to transpose certain columns into rows within a DataFrame for restructuring data or to facilitate analysis. It then uses df. This is where **transposing** comes in: swapping rows with columns. Download the sample workbook and enjoy learning with us! Jan 27, 2021 · I think if you just want the first and second columns swapped you should change the code to be something like this: for i in m: i[1],i[0] = i[0],i[1] Jan 27, 2023 · Create a function swapFirstandLastRow () to swap the first and last rows of an input matrix by accepting the input matrix, rows, and columns as arguments. iwhz mldr wrfwv xun ugtobjmyk kyqr hpzgkm jlbp axnr qdzja mkkfqs aah umpzexg qtkbo lujr