I'm learning Python so I wrote some scripts for the Ambient Light and Linear Poti bricklets.  This may be useful for people who are new to programming.

This gives a basic idea on how to use the bricklets as a switch.

 

Ambient Light:

#!/usr/bin/env python
# -*- coding: utf-8 -*-  
import os

HOST = "localhost"
PORT = 4223
UID = "xxx" # Change to your UID

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_ambient_light import AmbientLight

# Callback function for illuminance callback (parameter has unit Lux/10)
def cb_illuminance(illuminance):

    less = '''Light.\n
    oooooooooooooooooooooooooo\n
    oooooooooooooooooooooooooo\n
    oooooooooooooooooooooooooo\n
    oooooooooooooooooooooooooo\n
    oooooooooooooooooooooooooo\n
    oooooooooooooooooooooooooo'''

    more = '''Dark.\n
    --------------------------\n
    --------------------------\n
    --------------------------\n
    --------------------------\n
    --------------------------\n
    --------------------------'''

    running = True
    while running:
    # Test with print('Illuminance: ' + str(illuminance/10.0) + ' Lux')
        lux = str(illuminance/10.0)
        if str(49) < lux:
            os.system('clear')
            print less
            break
        if str(51) > lux:
            os.system('clear')
            print more
            break

if __name__ == "__main__":
    ipcon = IPConnection(HOST, PORT) # Create IP connection to brickd

    al = AmbientLight(UID) # Create device object
    ipcon.add_device(al) # Add device to IP connection
    # Don't use device before it is added to a connection

    # Set Period for illuminance callback to 1s (1000ms)
    # Note: The illuminance callback is only called every second if the 
    #       illuminance has changed since the last call!
    al.set_illuminance_callback_period(1000)

    # Register illuminance callback to function cb_illuminance
    al.register_callback(al.CALLBACK_ILLUMINANCE, cb_illuminance)

    raw_input('Press key to exit\n') # Use input() in Python 3
    ipcon.destroy()

 

Linear Poti:

#!/usr/bin/env python
# -*- coding: utf-8 -*-  
import os

HOST = "localhost"
PORT = 4223
UID = "xxx" # Change to your UID

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_linear_poti import LinearPoti

# Callback function for position callback (parameter has range 0-100)
def cb_position(position):

    less = '''Switch Off.\n
    -------------\n
    -------------\n
    -------------\n
    0000000000000'''

    more = '''Switch On.\n
    0000000000000\n
    -------------\n
    -------------\n
    -------------'''

    running = True
    while running:
    # Test with print('Position: ' + str(position))
        slide = str(position)
        if str(49) < slide:
            os.system('clear')
            print less
            break
        if str(51) > slide:
            os.system('clear')
            print more
            break
        
if __name__ == "__main__":
    ipcon = IPConnection(HOST, PORT) # Create IP connection to brickd

    poti = LinearPoti(UID) # Create device object
    ipcon.add_device(poti) # Add device to IP connection
    # Don't use device before it is added to a connection

    # Set Period for position callback to 0.05s (50ms)
    # Note: The position position is only called every 50ms if the 
    #       position has changed since the last call!
    poti.set_position_callback_period(50)

    # Register position callback to function cb_position
    poti.register_callback(poti.CALLBACK_POSITION, cb_position)

    raw_input('Press key to exit\n') # Use input() in Python 3
    ipcon.destroy()

Cool Maybe you can put your code in the wiki into the code kitchen category too, so other people can find it there too http://www.tinkerunity.org/wiki/index.php/Category:Code-Sammlung / http://www.tinkerunity.org/wiki/index.php/Category:Python

Done. Although I'm new to the Wiki stuff so I'm sure someone can make it look better.  I'll add onto it as I play with Python more.

I moved your code to its own page and added it to both categories (code kitchen and python) http://www.tinkerunity.org/wiki/index.php/Ambient_Light_Switch

Its easier to get an overview, if there are more code examples. You can see all Python code examples on the python page automatically http://www.tinkerunity.org/wiki/index.php/Category:Python

 

If you have some more code snippets, just create a new page in the wiki and add the following to the bottom of the wiki page: [[Category:Code-Sammlung]] [[Category:Python]] and your new page will appear on both category pages.