Why Does Zipping Three 20-Element Lists in Python Result in a 20-Element List?

Zipping Lists in Python

In Python, the 'zip()' function combines multiple lists into a single list of tuples. Each tuple contains elements from corresponding positions in the input lists.

Question:

A user encountered an unexpected result while zipping three lists of size 20 each. Contrary to their expectation of three elements, the zipped list had 20 elements.

Answer:

When zipping multiple lists, the resulting list contains as many elements as the shortest input list. In this case, all three input lists have 20 elements, so the zipped list also has 20 elements. However, each element is a three-tuple, containing elements from corresponding positions in the three input lists.

Example:

a = b = c = range(20)
result = zip(a, b, c)

print(len(result))  # 20
print(len(result[0]))  # 3

Conclusion:

Zipping lists creates a new list where each element is a tuple of elements from the corresponding positions in the input lists. The length of the zipped list matches the shortest input list, while the length of each tuple matches the number of input lists.

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