From 8e75144e5d5c776ca65988bbba50361753b6ab54 Mon Sep 17 00:00:00 2001
From: Bas Nijholt <basnijholt@gmail.com>
Date: Mon, 21 Jul 2025 15:22:11 -0700
Subject: [PATCH] Fix webapp Pyodide compatibility: pin matplotlib and
 contourpy versions  (#1242)

* Fix webapp README: correct pip install command

The README had incorrect syntax for pip install. Changed from
`pip install requirements.txt` to `pip install -r requirements.txt`.

* Fix webapp Pyodide compatibility: pin matplotlib and contourpy versions

The webapp uses Shinylive which runs Python in the browser via Pyodide.
Pyodide only supports specific versions of packages that have C extensions.
Pin matplotlib to 3.8.4 and contourpy to 1.3.1 to match Pyodide's available versions.

This fixes the "Can't find a pure Python 3 wheel for 'contourpy==1.3.2'" error
when loading the webapp.
---
 webapp/README.md           |  2 +-
 webapp/requirements.txt    | 10 ++++++----
 webapp/requirements.txt.in |  3 ++-
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/webapp/README.md b/webapp/README.md
index 45ee754a..b12432eb 100644
--- a/webapp/README.md
+++ b/webapp/README.md
@@ -2,7 +2,7 @@ To run this app locally, install the requirements and run `shiny run`.
 
 ```
 $ cd webapp
-$ pip install requirements.txt
+$ pip install -r requirements.txt
 $ shiny run
 ```
 
diff --git a/webapp/requirements.txt b/webapp/requirements.txt
index 04c991f2..c09a3d7a 100644
--- a/webapp/requirements.txt
+++ b/webapp/requirements.txt
@@ -1,5 +1,5 @@
 # This file was autogenerated by uv via the following command:
-#    uv pip compile --output-file=requirements.txt requirements.txt.in
+#    uv pip compile requirements.txt.in --output-file requirements.txt
 anyio==4.9.0
     # via
     #   starlette
@@ -14,8 +14,10 @@ click==8.2.1
     # via
     #   shiny
     #   uvicorn
-contourpy==1.3.2
-    # via matplotlib
+contourpy==1.3.1
+    # via
+    #   -r requirements.txt.in
+    #   matplotlib
 cycler==0.12.1
     # via matplotlib
 fonttools==4.58.5
@@ -36,7 +38,7 @@ markdown-it-py==3.0.0
     # via
     #   mdit-py-plugins
     #   shiny
-matplotlib==3.10.3
+matplotlib==3.8.4
     # via -r requirements.txt.in
 mdit-py-plugins==0.4.2
     # via shiny
diff --git a/webapp/requirements.txt.in b/webapp/requirements.txt.in
index 9703163f..986a4976 100644
--- a/webapp/requirements.txt.in
+++ b/webapp/requirements.txt.in
@@ -1,4 +1,5 @@
 astral==2.2
-matplotlib
+matplotlib==3.8.4
+contourpy==1.3.1
 shinyswatch
 shiny