<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Use the zip function to combine two lists by index.
list1 = [1, 2, 3]
list2 = [4, 5, 6]<|im_end|>
<|im_start|>assistant
list3 = list(zip(list1, list2))

#Output:
list3 = [(1, 4), (2, 5), (3, 6)]<|im_end|>
