geocode.py

def geocode(df):
    locator = Nominatim(user_agent="myGeocoder")
    geocode = RateLimiter(locator.geocode, min_delay_seconds=1)
    df["location"] = df["geocode_col"].apply(geocode)
    df["point"] = df["location"].apply(lambda loc: tuple(loc.point) if loc else None)
    df[["latitude", "longitude", "altitude"]] = pd.DataFrame(
        df["point"].tolist(), index=df.index
    )
    return df