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WTForms Breaking Change 2.3.0

See original GitHub issue

Apache Airflow version: 1.10.9

Kubernetes version (if you are using kubernetes) (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.3", GitCommit:"06ad960bfd03b39c8310aaf92d1e7c12ce618213", GitTreeState:"clean", BuildDate:"2020-02-13T18:06:54Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.8", GitCommit:"c52f59bbba5fbf21fbb18e9a06f96e563fe4c20a", GitTreeState:"clean", BuildDate:"2020-01-31T20:00:26Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}

Environment: AKS

Cloud provider or hardware configuration: AKS
OS (e.g. from /etc/os-release):
Kernel (e.g. uname -a):
Install tools: Helm

Client: &version.Version{SemVer:"v2.15.1", GitCommit:"cf1de4f8ba70eded310918a8af3a96bfe8e7683b", GitTreeState:"clean"}                                  Server: &version.Version{SemVer:"v2.15.2", GitCommit:"8dce272473e5f2a7bf58ce79bb5c3691db54c96b", GitTreeState:"clean"}

Others:

What happened: Getting the following ImportError this morning:

*** waiting 10s...
*** executing initdb
[2020-04-22 14:47:47,388] {{settings.py:253}} INFO - settings.configure_orm(): Using pool settings. pool_size=5, max_overflow=10, pool_recycle=1800, pid=26
Traceback (most recent call last):
  File "/usr/local/bin/airflow", line 26, in <module>
    from airflow.bin.cli import CLIFactory
  File "/usr/local/lib/python3.7/site-packages/airflow/bin/cli.py", line 71, in <module>                                                                
    from airflow.www_rbac.app import cached_app as cached_app_rbac
  File "/usr/local/lib/python3.7/site-packages/airflow/www_rbac/app.py", line 27, in <module>                                                           
    from flask_appbuilder import AppBuilder, SQLA
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/__init__.py", line 6, in <module>                                                       
    from .base import AppBuilder  # noqa: F401
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/base.py", line 8, in <module>                                                           
    from .api.manager import OpenApiManager
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/api/manager.py", line 7, in <module>                                                    
    from flask_appbuilder.baseviews import BaseView
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/baseviews.py", line 21, in <module>                                                     
    from .forms import GeneralModelConverter
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/forms.py", line 17, in <module>                                                         
    from .fieldwidgets import (
  File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/fieldwidgets.py", line 3, in <module>                                                   
    from wtforms.widgets import html_params, HTMLString
ImportError: cannot import name 'HTMLString' from 'wtforms.widgets' (/usr/local/lib/python3.7/site-packages/wtforms/widgets/__init__.py)

What you expected to happen:

due to breaking change here in v2.3.0: https://github.com/wtforms/wtforms/compare/2.2.1...2.3.0#diff-6393540c887450b9738cb2eecc5bcad8

How to reproduce it:

Anything else we need to know: