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      "content": "```python\nsum(xs)\n```\n\nPython's built-in `sum()` does exactly this. If you want alternatives:\n\n```python\n# Using functools.reduce\nfrom functools import reduce\nreduce(lambda a, b: a + b, xs, 0)\n\n# Manual loop (as a one-liner via a lambda)\n(lambda xs: __import__(\"functools\").reduce(lambda a, b: a + b, xs, 0))(xs)\n```\n\nBut `sum(xs)` is the idiomatic choice — it's fast, readable, and handles empty lists (returning `0`).",
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