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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def geopy_geolocator():
    '''Lazy loader for geocoder from geopy. This currently loads the 
    `Nominatim` geocode and returns an instance of it, taking ~2 us.
    '''
    global geolocator
    if geolocator is None:
        try:
            from geopy.geocoders import Nominatim
        except ImportError:
            return None
        geolocator = Nominatim(user_agent=geolocator_user_agent)
        return geolocator
    return geolocator