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Pythonのオブジェクトでの代入と変更

Posted at

概要

Pythonでモヤモヤしていたのでテスト。
詳しくは、元記事(https://qiita.com/yuta0801/items/f8690a6e129c594de5fb )を参照ください。
(私は挙動を知りたいだけなので、参照渡しがどうとか言われても興味がありません。また今度勉強します。)

内容

tmp.py
obj = {'arr': ['hoge']}
print(obj)

arr = obj['arr']
obj['arr'] = []

print(obj)
print(arr)
output
{'arr': ['hoge']}
{'arr': []}
['hoge']

蛇足

tmp.py
obj = {'arr': ['hoge']}
print(obj)

arr = obj['arr']
arr.append('fuga')
print(obj)
print(arr)

obj['arr'] = []
print(obj)
print(arr)
output
{'arr': ['hoge']}
{'arr': ['hoge', 'fuga']}
['hoge', 'fuga']
{'arr': []}
['hoge', 'fuga']

すっきりした

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