Web Reference: Oct 3, 2025 · Iterating over rows means processing each row one by one to apply some calculation or condition. For example, Consider a DataFrame of student's marks with columns Math and Science, you want to calculate the total score per student row by row. Iterating through pandas objects is generally slow. In many cases, iterating manually over the rows is not needed and can be avoided with one of the following approaches: Look for a vectorized solution: many operations can be performed using built-in methods or NumPy functions, (boolean) indexing, … When you apply a Series to a for loop, you can get its value in order. If you specify a column in the DataFrame and apply it to a for loop, you can get the value of that column in order.
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