On 2022-01-04 22:57, Israel Brewster wrote:
I’m running into an issue with shapely that is baffling me. Perhaps someone
here can help out?
When running shapely directly from a python 3.8 interpreter, it works as
expected:
import shapely
shapely.__version__
'1.8.0'
from shapely.geometry import Polygon
bounds = [-164.29635821669632, 54.64251856269729, -163.7631779798799,
54.845450778742546]
print(Polygon.from_bounds(*bounds))
POLYGON ((-164.2963582166963 54.64251856269729, -164.2963582166963
54.84545077874255, -163.7631779798799 54.84545077874255, -163.7631779798799
54.64251856269729, -164.2963582166963 54.64251856269729))
However, if I put this exact same code into my Flask app (currently running
under the Flask development environment) as part of handling a request, I get
an empty polygon:
import shapely
print(shapely.__version__)
from shapely.geometry import Polygon
print(Polygon.from_bounds(*bounds))
In that piece of code you didn't set 'bounds'. It might be worth setting
it or at least printing it out to double-check.
Output:
1.8.0
POLYGON EMPTY
In fact, *any* attempt to create a polygon gives the same result:
test = Polygon(((1, 1), (2, 1), (2, 2)))
print(test)
POLYGON EMPTY
Did you try that piece of code both in Flask and from the command line,
again to double-check.
What am I missing here? Why doesn’t it work as part of a Flask request call?
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