flask_cache模块No module named ‘flask.ext‘ 报错处理

报错信息：

[root@ynlink-02 ynlink-api]# flask run
 * Serving Flask app "main.py"
 * Environment: development
 * Debug mode: off
Usage: flask run [OPTIONS]

Error: While importing "main", an ImportError was raised:

Traceback (most recent call last):
  File "/usr/local/python3/lib/python3.7/site-packages/flask/cli.py", line 240, in locate_app
    __import__(module_name)
  File "/home/microService/ynlink-api/main.py", line 54, in <module>
    app = create_app()
  File "/home/microService/ynlink-api/main.py", line 29, in create_app
    cache.init_app(app)
  File "/usr/local/python3/lib/python3.7/site-packages/flask_cache/__init__.py", line 156, in init_app
    from .jinja2ext import CacheExtension, JINJA_CACHE_ATTR_NAME
  File "/usr/local/python3/lib/python3.7/site-packages/flask_cache/jinja2ext.py", line 33, in <module>
    from flask.ext.cache import make_template_fragment_key
ModuleNotFoundError: No module named 'flask.ext'

处理方法：
vi /usr/local/python3/lib/python3.7/site-packages/flask_cache/jinja2ext.py

33行代码

from flask.ext.cache import make_template_fragment_key
修改为
from flask_cache import make_template_fragment_key