Web Reference: May 7, 2019 · To create a new column, use the square brackets [] with the new column name at the left side of the assignment. Sep 29, 2025 · In this article, we’ll explore different ways to create a new column in a Pandas DataFrame based on existing columns. This is a common task in data analysis when you need to transform or categorize your data. We can use case_when method to create a new column using a switch statement. First, assign a column with the default value ('Other' in the example in the OP), and then replace values in this new column using a list of (condition, replacement value) tuples.
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