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When I look at an LED light bulb, I notice it seems to pulsate. I'm curious about two aspects: (1) Do different light sources actually emit light in pulses? I know LEDs flicker, but what about the sun...

I have a list of numbers and I want to filter out all numbers less than 10. I know I can use a for loop, but I've heard list comprehensions are more Pythonic. Can someone show me how?