Don't pyimport repr multiple times

src/pyodide.js

@@ -75,16 +75,6 @@ var languagePluginLoader = new Promise((resolve, reject) => {
         return promise;
     };
 
-    ////////////////////////////////////////////////////////////
-    // Callable Python object shim
-    let makeCallableProxy = (obj) => {
-        var clone = obj.clone();
-        function callProxy(args) {
-            return clone.call(Array.from(arguments), {});
-        };
-        return callProxy;
-    };
-
     ////////////////////////////////////////////////////////////
     // Loading Pyodide
     let wasmURL = `${baseURL}pyodide.asm.wasm`;
@@ -112,7 +102,6 @@ var languagePluginLoader = new Promise((resolve, reject) => {
         script.onload = () => {
             window.pyodide = pyodide(Module);
             window.pyodide.loadPackage = loadPackage;
-            window.pyodide.makeCallableProxy = makeCallableProxy;
         };
         document.head.appendChild(script);
     };

src/pyproxy.c

@@ -127,9 +127,10 @@ EM_JS(int, pyproxy_init, (), {
     get: function (jsobj, jskey) {
       if (jskey === 'toString') {
         return function() {
-          // TODO: Cache repr
-          var repr = pyodide.pyimport('repr');
-          return repr(jsobj);
+          if (window.pyodide.repr === undefined) {
+            window.pyodide.repr = window.pyodide.pyimport('repr');
+          }
+          return window.pyodide.repr(jsobj);
         }
       } else if (jskey === '$$') {
         return jsobj['$$'];