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PythonAdvent Calendar 2023

Day 4

Pythonで「オブジェクトが同一かどうかの比較する(== 演算子と is 演算子の違い)」の動作を確認してみた

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概要

Pythonで「オブジェクトが同一かどうかの比較する(== 演算子と is 演算子の違い)」の動作を確認してみました。以下のページを参考にしました。

実装

以下のファイルを作成しました。

sample.py
list1 = [1, 2, 3]
list2 = [1, 2, 3]
print(list1 == list2)
print(list1 is list2)

list1 = [1, 2, 3]
list2 = list1
print(list1 == list2)
print(list1 is list2)

str1 = "Apple"
str2 = "Apple"
print(str1 == str2)
print(str1 is str2)

list1 = [1, 2, 3]
list2 = [1, 2, 3]
print(id(list1))
print(id(list2))

list1 = [1, 2, 3]
list2 = list1
print(id(list1))
print(id(list2))

num1 = 10
num2 = 10
print(id(num1))
print(id(num2))

以下のコマンドを実行しました。

$ python3 sample.py 
True
False
True
True
True
True
140512374329088
140512374251008
140512372795648
140512372795648
140512375439888
140512375439888

まとめ

何かの役に立てばと。

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