what are the different epsgs geopandas code example

Example 1: geopandas set crs

my_geoseries = my_geoseries.set_crs("EPSG:4326")
my_geoseries = my_geoseries.set_crs(epsg=4326)

Example 2: geodataframe change crs

geodataframe = geodataframe.to_crs('')