Web Reference: If you cast a column to "str" instead of "string", the result is going to be an object type with possible nan values. If you then save your dataframe into a Null sensible format, e.g. Parquet file, you will have a lot of headache because of this "str". Jul 11, 2025 · Pandas offers several simple ways to change or convert the data types of columns in a DataFrame. In this article, we'll look at different methods to help you easily change data types according to your needs. To convert a column within a Pandas DataFrame from integer to string, you can use the astype () method or the apply () method with the str () function. Here are both approaches:
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