how to use date from my database for datey.add

[luna...@gmail.com]

i use for my project this chart pygal

from datetime import datetime, timedelta
datey = pygal.DateY(x_label_rotation=20)
datey.add("Visits", [
    (datetime(2013, 1, 2), 300),
    (datetime(2013, 1, 12), 412),
    (datetime(2013, 2, 2), 823),
    (datetime(2013, 2, 22), 672)
])
datey.render()

but the problem is when i want to use datetime from my base i have this error TypeError: can't compare datetime.datetime to float i used this code

hum  = []
temp = []

users = models.temp.query.all()
for u in users:
  hum.append((u.temperature ))
  temp.append((u.timew)

@app.route('/something.svg')
def graph_something():
   datey = pygal.DateY(x_label_rotation=20,  show_dots=False)
   datey.add("Visits", 
   (temp, hum))
   return datey.render() 
   return datey_chart.render_response()