just share, hope can help others
*e.g.*
*controllers/default.py*
def test():
table = db.test

if session.lat and session.lon:
table.lat.default = session.lat
table.lon.default = session.lon

#import gluon.contrib.simplejson
#import urllib
#import json
import requests

url = 
'http://maps.googleapis.com/maps/api/geocode/json?latlng=%s,%s&sensor=true' 
% (session.lat, session.lon)

#jsonurl = urllib.urlopen(url) #urllib.urlopen
    
#data = gluon.contrib.simplejson.loads(jsonurl.read() )
#data = json.loads(jsonurl.read() )
   
jsonurl = requests.get(url) # requests
data = jsonurl.json()

table.address.default = data['results'][0]['formatted_address']
table.zip_code.default = 
data['results'][0]['address_components'][10]['long_name']
table.city.default = 
data['results'][0]['address_components'][8]['long_name']
table.country.default = 
data['results'][0]['address_components'][9]['long_name']

fields = None
form = SQLFORM(table, fields = fields)
if form.process(formname = 'form_modal').accepted:
current.response.flash = 'form has submitted'
elif form.errors:
current.response.flash = 'form has errors'
return dict(form = form)

best regards,
stifan

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