docs: Add caveat.

README.md

@@ -2,6 +2,12 @@
 
 [Python](https://www.python.org/) WASM plugin for [proto](https://github.com/moonrepo/proto).
 
+## Caveats
+
+This plugin only supports pre-builts via [indygreg/python-build-standalone](https://github.com/indygreg/python-build-standalone), and primarily only Python 3.
+
+Building from source (with `python-build`), and supporting Python 2, will be supported in the future.
+
 ## Contributing
 
 Build the plugin:

src/proto.rs

@@ -74,7 +74,7 @@ pub fn locate_bins(Json(input): Json<LocateBinsInput>) -> FnResult<Json<LocateBi
     let mut bin_path = format_bin_name("install/bin/python3", env.os);
     let mut globals_lookup_dirs = vec!["$HOME/.local/bin".to_owned()];
 
-    // Only available for pre-builts
+    // Manifest is only available for pre-builts
     let manifest_path = input.context.tool_dir.join("PYTHON.json");
 
     if manifest_path.exists() {
@@ -83,7 +83,7 @@ pub fn locate_bins(Json(input): Json<LocateBinsInput>) -> FnResult<Json<LocateBi
         bin_path = manifest.python_exe;
 
         if env.os == HostOS::Windows {
-            let formatted_version = manifest.python_major_minor_version.replace(".", "");
+            let formatted_version = manifest.python_major_minor_version.replace('.', "");
 
             globals_lookup_dirs.push(format!(
                 "$APPDATA/Roaming/Python{}/Scripts",

src/version.rs

@@ -1,3 +1,5 @@
+#![allow(dead_code)]
+
 use once_cell::sync::Lazy;
 use regex::Regex;