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some recursive function:\n```python\ndef sumrange(x):\n    if x == 0:\n        return 0\n\n    r = sumrange(x - 1)\n    return x + r\n\nprint(sumrange(10))  # 55\n```\nPretty simple. But what if we pass a large number as the argument\n```python\nprint(sumrange(1000))\n# RecursionError: maximum recursion depth exceeded\n```\nLet's fix it with precursion module:\n```python\nfrom precursion import precurse\n\n@precurse\ndef sumrange(x):\n    if x == 0:\n        # return was:\n        # return 0\n        # now we need to use StopIteration exception:\n        raise StopIteration(0)\n\n    # recursive call was:\n    # r = sumrange(x - 1)\n    # now we use yield:\n    r = yield sumrange.r(x - 1)\n    raise StopIteration(x + r)\n\nprint(sumrange(1000))  # 500500!!1\n```\nThat's it!\n\n#### What is `.r` in `sumrange.r`?\n\nIt's the unwrapped function, so you `yield` an unwrapped generator\n\n## Pros and cons:\n\n#### Pros\nThe code looks cleaner. Yep.\n\n#### Cons\nFunction calls have performance and memory overhead, so using\n this decorator is slower than if you replace recursive calls with\n a stack with a while-loop or\n a [tail recursive call](https://en.wikipedia.org/wiki/Tail_call) with\n a while-loop.","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpython273%2Fprecursion","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpython273%2Fprecursion","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpython273%2Fprecursion/lists"}