エラー

$ docker-compose --version

Traceback (most recent call last):
  File "/Users/yumainaura/.pyenv/versions/3.7.3/bin/docker-compose", line 5, in <module>
    from compose.cli.main import main
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/compose/cli/main.py", line 17, in <module>
    import docker
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/docker/__init__.py", line 2, in <module>
    from .api import APIClient
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/docker/api/__init__.py", line 2, in <module>
    from .client import APIClient
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/docker/api/client.py", line 8, in <module>
    import websocket
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/__init__.py", line 23, in <module>
    from ._app import WebSocketApp
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/_app.py", line 36, in <module>
    from ._core import WebSocket, getdefaulttimeout
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/_core.py", line 34, in <module>
    from ._handshake import *
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/_handshake.py", line 30, in <module>
    from ._http import *
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/_http.py", line 31, in <module>
    from ._socket import*
  File "/Users/yumainaura/.pyenv/versions/3.7.3/lib/python3.7/site-packages/websocket/_socket.py", line 30, in <module>
    from ._ssl_compat import *
AttributeError: module 'websocket._ssl_compat' has no attribute 'ssl'

調べる

docker コマンドはシステム ( たぶん Docker for Mac でインストールされたやつ ) のものを使っているが
docker-compose コマンドは python のものを利用していることが判明

which docker
/usr/local/bin/docker

which docker-compose
/Users/yumainaura/.pyenv/shims/docker-compose

解決

pip の docker-compose を使わないようにした

pip uninstall docker-compose

$ which docker-compose
/usr/local/bin/docker-compose

Original by Github issue

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