How to rename a single column of a pandas DataFrame

In our previous post How to replace string in column names in Pandas DataFrame we already covered a generic method of renaming pandas columns by replacing strings.

If you just want to rename a specific column, say, the column is named value and you want to convert it to €, use this snippet:

new_df = df.rename(columns=lambda s: "€" if s == "value" else s)

or use inplace=True if you want to modify the original DataFrame:

df.rename(columns=lambda s: "€" if s == "value" else s, inplace=True)