Change ipywidgets version check to use __version__. Fixes #1571. (#1573)

* Change ipywidgets version check to use __version__ instead of version_info. Fixes Issue #1571.

* Update CI images.

* Improve version handling (thanks @apayne97).

devtools/azure-pipelines-linux.yml

@@ -1,20 +1,20 @@
 jobs:
 - job: 'Linux'
   pool:
-    vmImage: 'Ubuntu-18.04'
+    vmImage: 'ubuntu-22.04'
   timeoutInMinutes: 360
 
   strategy:
     matrix:
-      Python37:
-        CONDA_PY: '3.7'
-        CONDA_NPY: '1.18'
       Python38:
         CONDA_PY: '3.8'
         CONDA_NPY: '1.18'
       Python39:
         CONDA_PY: '3.9'
         CONDA_NPY: '1.19'
+      Python310:
+        CONDA_PY: '3.10'
+        CONDA_NPY: '1.21'
 
     maxParallel: 10
 

devtools/azure-pipelines-osx.yml

@@ -2,18 +2,18 @@ jobs:
 - job:
   displayName: "OS X"
   pool:
-    vmImage: 'macOS-10.15'
+    vmImage: 'macOS-11'
   strategy:
     matrix:
-      Python37:
-        CONDA_PY: '3.7'
-        CONDA_NPY: '1.18'
       Python38:
         CONDA_PY: '3.8'
         CONDA_NPY: '1.18'
       Python39:
         CONDA_PY: '3.9'
         CONDA_NPY: '1.19'
+      Python310:
+        CONDA_PY: '3.10'
+        CONDA_NPY: '1.21'
 
   steps:
   - template: checkout.yml

devtools/azure-pipelines-win.yml

@@ -5,15 +5,15 @@ jobs:
     vmImage: "windows-2019"
   strategy:
     matrix:
-      Python37:
-        CONDA_PY: '3.7'
-        CONDA_NPY: '1.18'
       Python38:
         CONDA_PY: '3.8'
         CONDA_NPY: '1.18'
       Python39:
         CONDA_PY: '3.9'
         CONDA_NPY: '1.19'
+      Python310:
+        CONDA_PY: '3.10'
+        CONDA_NPY: '1.21'
 
   steps:
   - template: checkout.yml

pyemma/_base/progress/reporter/__init__.py

@@ -1,4 +1,5 @@
 from numbers import Integral
+from typing import Optional
 
 
 def _simple_memorize(f):
@@ -12,12 +13,23 @@ def wrapper():
     return wrapper
 
 
+def _ipywidgets_major_version() -> Optional[int]:
+    r""" Determine ipywidgets major version if possible, otherwise return None. """
+    import ipywidgets
+    if hasattr(ipywidgets, '__version__'):
+        return int(ipywidgets.__version__.split('.')[0])
+    elif hasattr(ipywidgets, 'version_info'):
+        return ipywidgets.version_info[0]
+    else:
+        return None
+
+
 @_simple_memorize
 def _attached_to_ipy_notebook_with_widgets():
     try:
         # check for widgets
-        import ipywidgets
-        if ipywidgets.version_info[0] < 4:
+        version = _ipywidgets_major_version()
+        if version is None or version < 4:
             raise ImportError()
         # check for ipython kernel
         from IPython import get_ipython