Python script works on APIC Release 4.1 and 4.2, errors on Release 5.x

[Michyfish]

Hello all--I am using a basic script to pull information from ACI about its endpoints. The script worked just fine pointed at the Cisco DevNet sandbox, but then broke when I pointed it at my lab environment. (Changing only the credentials.) Other experimentation seems to indicate that the script works for Releases 4.1 and 4.2, but not 5.x (I've got 5.1 running in my lab.) The script and the error are included here:

GET_ACI_endpoints.txt

GET_ACI_endpoints_error.txt