PG Bug reporting form <noreply(at)postgresql(dot)org> writes: > # Steps to Reproduce > Install extension plpython3u > Create function using data type numeric as an input, may be unique input or > in combination with other data types. > Use Function in query such as SELECT or UPDATE.
Hm. The given test case works fine for me, using python 3.7.4 on a Fedora 30 installation. I suspect some oddness in your python installation, maybe there are unusual components in it?