195 windows 11 pyroll run gets stuck in an endless loop due to problems with kaleido package (#206)

* added warning for Windows users that, when using plotly a certain kaleido version is required

* added platform dependent installation of kaleido when installing pyroll-core[plotly]

* minor formatting corrections

Author: RichardPfr

pyproject.toml

@@ -52,7 +52,8 @@ matplotlib = [
 plotly = [
     "plotly ~= 5.18",
     "pandas ~= 2.0",
-    "kaleido"
+    "kaleido; platform_system != 'Windows'",
+    "kaleido == 0.1.0.post1; platform_system == 'Windows'"
 ]
 
 [project.urls]

pyroll/core/__init__.py

@@ -34,10 +34,24 @@
 )
 
 # determine available plotting backend, plotly is preferred
+
+import platform
+
 try:
     import plotly as _
     PLOTTING_BACKEND = "plotly"
 
+    try:
+        import kaleido
+        try:
+            if platform.system() == 'Windows':
+                if kaleido.__version__ != '0.1.0.post1':
+                    raise ValueError("Kaleido Version 0.1.0.post1 is required to use plotly on Windows machines")
+        except AttributeError:
+            pass
+    except ImportError:
+        print("The kaleido package is required if plotly is to be used")
+
 except ImportError:
     try:
         import matplotlib as _