wgs84_to_webmercator.py

import pandas as pd
from pyproj import Transformer


def towgs84(row, lat_col, lon_col):
  """An apply function for a pyproj transformer from 4326/WGS84 to 3857/web mercator
  
  :param row: a row of a pandas dataframe as supplied by df.apply().
  :param lat_col: str of the lat col
  :param lon_col: str of the lon col
  """
    transformer = Transformer.from_crs("epsg:4326", "epsg:3857")
    row['lon'], row['lat'] = transformer.transform(row[lon_col], row[lat_col])
    
    return row
  
  df = df.apply(to_web_mercator, axis=1)