How Can I Efficiently Partition a List Based on a Condition in Python?

Partitioning Lists Based on Conditions with Improved Efficiency

In your task of dividing a list (mylist) based on a specified condition, the aim is to achieve this division with greater efficiency. Specifically, you wish to avoid multiple iterations over the list and enhance performance.

To address these requirements, consider the following approach:

• Iterate over the elements of mylist manually.
• For each element, evaluate whether it meets the condition (x in goodvals).
• Based on the result of the condition, append the element either to the good list or the bad list.

This approach reduces the number of list iterations from two to one, potentially enhancing performance:

good, bad = [], []
for x in mylist:
    (bad, good)[x in goodvals].append(x)

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