There is a column with numbers in a DataFrame, I want to convert it to string type. How to do it? And if not using astype?

To convert a column with numbers in a DataFrame to a string type, you typically use the astype(str) method, for example:

import pandas as pd

df['column'] = df['column'].astype(str)

If astype cannot be used, you can apply the apply method with the str function:

df['column'] = df['column'].apply(str)

Or use the map method:

df['column'] = df['column'].map(str)

All these methods convert numeric values to strings, with apply and map offering more flexibility for custom conversions.