Merge pull request #854 from plotly/import-test

improve dash import test

Author: alexcjohnson

CHANGELOG.md

@@ -2,6 +2,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [UNRELEASED]
+### Fixed
+- [#854](https://github.com/plotly/dash-table/pull/854) - part of fixing dash import bug https://github.com/plotly/dash/issues/1143
+
 ## [4.11.1] - 2020-12-07
 ### Fixed
 - [#844](https://github.com/plotly/dash-table/pull/844) Fix a bug where the table is using classes that are styled by Bootstrap

dash_table_base/__init__.py

@@ -9,7 +9,7 @@
 from ._imports_ import *  # noqa: F401, F403
 from ._imports_ import __all__
 
-if not hasattr(_dash, "development"):
+if not hasattr(_dash, '__plotly_dash') and not hasattr(_dash, 'development'):
     print(
         "Dash was not successfully imported. "
         "Make sure you don't have a file "