move data parsing to its own function

test.py

@@ -5,12 +5,13 @@ import zipfile
 from flask import Flask, render_template
 app = Flask(__name__)
 
-@app.route("/")
-def main():
-    out = [] 
-    data = ["title",
-            "authors",
-            "isbn"]
+data = []
+attributes= ["title",
+             "authors",
+             "isbn"]
+
+def updateData():
+    out = []
 
     f = zipfile.ZipFile("library.tc")
     tree = ElementTree.parse(f.open("tellico.xml"))
@@ -28,7 +29,13 @@ def main():
         bookout["authors"] = "; ".join(authors)
 
         out.append(bookout.copy())
-    return render_template("books.html", books = out, data = data)
+    return out.copy()
+
+@app.route("/")
+def main():
+    data = updateData();
+    return render_template("main.html", books = data, attributes = attributes)
+
 
 if __name__ == "__main__":
     app.run(debug=True, host='0.0.0.0')