Raspberry Pi and Python code

Develop a python program to simulate traffic lights.

This needs to implement one sequence of blinking LEDs as follows:

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RED ON indicating stop (1 second)

RED ON, YELLOW on indicating attention (1 second)

GREEN ON indicating go (1 second)

PAUSE (3 seconds)

GREEN ON, YELLOW blinking indicating attention (3 times)

RED ON indicating stop (1 second)

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Also if anyone has a raspberry pi could you show me how to set up three LED lights on a breadboard with a ribbon connected to a pi?