• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Mac OS X 10.15.4

• Poetry version: 1.0.5

Issue

% poetry add moviepy -E optional    
Using version ^1.0.2 for moviepy

Updating dependencies
Resolving dependencies... (17.9s)

[RecursionError]
maximum recursion depth exceeded