mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-12-01 15:22:59 -05:00
48 lines
871 B
Markdown
48 lines
871 B
Markdown
---
|
|
title: "Quick Python: Copy Decorator"
|
|
date: 2020-04-08T18:49:54-04:00
|
|
draft: false
|
|
tags: ["Python"]
|
|
---
|
|
|
|
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.
|
|
|
|
```python
|
|
from copy import deepcopy
|
|
def copy_arguments(func):
|
|
def wrapper(*args, **kwargs):
|
|
new_args = deepcopy(args)
|
|
new_kwargs = deepcopy(kwargs)
|
|
return func(*new_args, **new_kwargs)
|
|
return wrapper
|
|
```
|
|
|
|
Example usage:
|
|
|
|
```python
|
|
@copy_arguments
|
|
def modify1(xs):
|
|
for i, _ in enumerate(xs):
|
|
xs[i] *= 2
|
|
```
|
|
|
|
Comparison:
|
|
|
|
```python
|
|
def modify2(xs):
|
|
for i, _ in enumerate(xs):
|
|
xs[i] *= 2
|
|
|
|
a = [1, 2, 3, 4, 5]
|
|
b = [1, 2, 3, 4, 5]
|
|
modify1(a)
|
|
modify2(a)
|
|
print(a)
|
|
print(b)
|
|
```
|
|
|
|
```
|
|
[1, 2, 3, 4, 5]
|
|
[2, 4, 6, 8, 10]
|
|
```
|
|
|