[python] Apache 기류 설치 중 오류 발생

airflow -version 및 airflow initdb를 시도 할 때 위의 오류가 발생합니다.

  File "/home/ravi/sandbox/bin/airflow", line 26, in <module>
    from airflow.bin.cli import CLIFactory
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/bin/cli.py", line 70, in <module>
    from airflow.www.app import (cached_app, create_app)
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/app.py", line 37, in <module>
    from airflow.www.blueprints import routes
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/blueprints.py", line 25, in <module>
    from airflow.www import utils as wwwutils
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/utils.py", line 39, in <module>
    from flask_admin.model import filters
  File "/home/ravi/sandbox/lib/python3.6/site-packages/flask_admin/model/__init__.py", line 2, in <module>
    from .base import BaseModelView
  File "/home/ravi/sandbox/lib/python3.6/site-packages/flask_admin/model/base.py", line 8, in <module>
    from werkzeug import secure_filename
ImportError: cannot import name 'secure_filename' ```

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