Web Reference: Jul 11, 2025 · Adding a new column to a DataFrame in Pandas is a simple and common operation when working with data in Python. You can quickly create new columns by directly assigning values to them. I would like to add a new column, 'e', to the existing data frame and do not want to change anything in the data frame (i.e., the new column always has the same length as the DataFrame). This might be the most commonly used method for creating a new column. We specify the column name like we are selecting a column in the DataFrame. Then, the values are assigned to this column. A new column is added as the last column, i.e. the column with the highest index. We can also add multiple columns at once. Column names are passed in a list...
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