diff --git a/lib/assets/libs/modulefinder.js b/lib/assets/libs/modulefinder.js
new file mode 100644
--- /dev/null
+++ b/lib/assets/libs/modulefinder.js
@@ -0,0 +1,50 @@
+var $module=(function($B){
+
+var _b_=$B.builtins
+var _mod = {}
+
+$ModuleFinderDict = {__class__:$B.$type,__name__:'ModuleFinder'}
+$ModuleFinderDict.__mro__ = [$ModuleFinderDict,_b_.object.$dict]
+
+$ModuleFinderDict.run_script = function(self, pathname){
+    // pathname is the url of a Python script
+    var py_src = _b_.$open(pathname).read()
+    // transform into internal Brython tree structure
+    var root = $B.py2js(py_src)
+    // walk the tree to find occurences of imports
+    function walk(node){
+        var modules = []
+        var ctx = node.context
+        if(ctx && ctx.type=='node'){ctx = ctx.tree[0]}
+
+        if(ctx && ctx.type=="import"){
+            for(var i=0, _len_i = ctx.tree.length; i < _len_i;i++){
+                if(modules.indexOf(ctx.tree[i].name)==-1){
+                    modules.push(ctx.tree[i].name)
+                }
+            }
+        }else if(ctx && ctx.type=="from"){
+            if(modules.indexOf(ctx.module)==-1){
+                modules.push(ctx.module)
+            }
+        }
+        
+        for(var i=0, _len_i = node.children.length; i < _len_i;i++){
+            mods = walk(node.children[i])
+            for(var j=0, _len_j = mods.length; j < _len_j;j++){
+                if(modules.indexOf(mods[j])==-1){modules.push(mods[j])}
+            }
+        }
+        return modules
+    }
+    self.modules = walk(root)
+}
+
+_mod.ModuleFinder = function(){return {__class__:$ModuleFinderDict}
+}
+_mod.ModuleFinder.$dict = $ModuleFinderDict
+_mod.ModuleFinder.__class__ = $B.$factory
+$ModuleFinderDict.$factory = _mod.ModuleFinder
+
+return _mod
+})(__BRYTHON__)