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25 lines
1.3 KiB
Markdown
25 lines
1.3 KiB
Markdown
---
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icon: package
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label: functools
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---
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### `functools.cache`
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A decorator that caches a function's return value each time it is called. If called later with the same arguments, the cached value is returned, and not re-evaluated.
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### `functools.lru_cache(maxsize=128)`
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A decorator that wraps a function with a memoizing callable that saves up to the maxsize most recent calls.
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### `functools.reduce(function, sequence, initial=...)`
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Apply a function of two arguments cumulatively to the items of a sequence, from left to right, so as to reduce the sequence to a single value. For example, `functools.reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])` calculates `((((1+2)+3)+4)+5)`. The left argument, `x`, is the accumulated value and the right argument, `y`, is the update value from the sequence. If the optional `initial` is present, it is placed before the items of the sequence in the calculation, and serves as a default when the sequence is empty.
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### `functools.partial(f, *args, **kwargs)`
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Return a new partial object which when called will behave like `f` called with the positional arguments `args` and keyword arguments `kwargs`. If more arguments are supplied to the call, they are appended to `args`. If additional keyword arguments are supplied, they extend and override `kwargs`.
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#### Source code
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:::code source="../../python/functools.py" ::: |