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49 lines
892 B
Markdown
49 lines
892 B
Markdown
---
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title: "Quick Python: Copy Decorator"
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date: 2020-04-08T18:49:54-04:00
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draft: false
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tags: ["Python"]
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medium_enabled: true
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---
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If you want to guarantee that your function doesn't modify any of the references and don't mind paying a price in memory consumption, here is a decorator you can easily add to your functions.
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```python
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from copy import deepcopy
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def copy_arguments(func):
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def wrapper(*args, **kwargs):
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new_args = deepcopy(args)
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new_kwargs = deepcopy(kwargs)
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return func(*new_args, **new_kwargs)
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return wrapper
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```
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Example usage:
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```python
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@copy_arguments
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def modify1(xs):
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for i, _ in enumerate(xs):
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xs[i] *= 2
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```
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Comparison:
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```python
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def modify2(xs):
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for i, _ in enumerate(xs):
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xs[i] *= 2
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a = [1, 2, 3, 4, 5]
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b = [1, 2, 3, 4, 5]
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modify1(a)
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modify2(a)
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print(a)
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print(b)
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```
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```
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[1, 2, 3, 4, 5]
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[2, 4, 6, 8, 10]
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```
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