How do I format a string using a dictionary in python-3.x?

Since the question is specific to Python 3, here’s using the new f-string syntax, available since Python 3.6:

>>> geopoint = {'latitude':41.123,'longitude':71.091}
>>> print(f'{geopoint["latitude"]} {geopoint["longitude"]}')
41.123 71.091

Note the outer single quotes and inner double quotes (you could also do it the other way around).