某列转换为字符串：df['BucketType'] = pd.Series(df['BucketType'], dtype="string")df['BucketType'] = pd.Series(df['BucketType'], dtype=pd.StringDtype())df['BucketType'] = df['BucketType'].astype("string")

将某列改为字符串：df['A'] = df['A'].astype(str)将某列改为字符串：df[['B']] = df[['B']].astype(str)把多列改为字符串：df[['A','B']] = df[['A','B']].astype(str)将某列改为字符串：df['A'] = df['A'].apply(lambda _: str(_))