flask url_for 的问题

@app.route('/album/<slug>')
def show_album(slug):
r= get_root_dirs_files()
try:
r = r[slug]
except:
return 'Album Not Existing'

return render_template("albums.html",  dicts=r)

@app.route("/delete/<path:object_name>")
def delete(object_name):
obj = storage.get(object_name)
print obj
remove('./static/uploads/Pictures/%s' % (obj.name))
return redirect(url_for('show_album'???))

delete 函数中， url_for show_album 函数时，里面的参数要怎么填？