Using photoresistor with 10kohm resistance

[Matthew]

I'm new here, a few hours ago i've received the fipy and im trying to get a value by the photoresistor,
the white cable between the photoresistor and resistor goes to pin 16 but i always get the value of 4095.0 even if i cover the photo or point it with the torch
then the red cable to 3V3 and black to GND
i've read that maybe this is caused by an incorrect time.sleep()
can someone pleas help me and explain me whats wrong?
thank you

import pycom
import time
import machine
from machine import Pin
adc = machine.ADC()
apin = adc.channel(pin='P16')
def reading():
   avg = 0
   _AVG_NUM = const(100)
   for _ in range (_AVG_NUM):
       avg += apin()
   avg /= _AVG_NUM
   return(avg)
while True:
    analog_val = reading()
    print(analog_val)
    time.sleep(1)
    pass

[livius]

@matthew
look at attenuation
https://docs.pycom.io/chapter/firmwareapi/pycom/machine/ADC.html#adcchannel--pin-attnadcattn0db
try ADC.ATTN_11DB