fixes #3

requirements.in

@@ -5,3 +5,4 @@ pandas
 sympy
 jupyterlab>=4.0.0
 jupyterlab_myst>=2.0.0
+ipywidgets>=8.*

requirements.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.10
 # by the following command:
 #
-#    pip-compile
+#    pip-compile requirements.in
 #
 anyio==3.7.0
     # via jupyter-server
@@ -64,9 +64,15 @@ idna==3.4
     #   jsonschema
     #   requests
 ipykernel==6.24.0
-    # via jupyterlab
+    # via
+    #   ipywidgets
+    #   jupyterlab
 ipython==8.14.0
-    # via ipykernel
+    # via
+    #   ipykernel
+    #   ipywidgets
+ipywidgets==8.0.7
+    # via -r requirements.in
 isoduration==20.11.0
     # via jsonschema
 jedi==0.18.2
@@ -121,6 +127,8 @@ jupyterlab-pygments==0.2.2
     # via nbconvert
 jupyterlab-server==2.23.0
     # via jupyterlab
+jupyterlab-widgets==3.0.8
+    # via ipywidgets
 kiwisolver==1.4.4
     # via matplotlib
 markupsafe==2.1.3
@@ -274,6 +282,7 @@ traitlets==5.9.0
     #   comm
     #   ipykernel
     #   ipython
+    #   ipywidgets
     #   jupyter-client
     #   jupyter-core
     #   jupyter-events
@@ -299,3 +308,5 @@ webencodings==0.5.1
     #   tinycss2
 websocket-client==1.6.1
     # via jupyter-server
+widgetsnbextension==4.0.8
+    # via ipywidgets