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【@デコレータ使用篇】Pythonの関数を辞書(dict)のValueに格納して、Keyに応じた関数を呼出す

Last updated at Posted at 2020-11-27

__前回__の__記事「Pythonの関数を辞書(dict)のValueに格納して、Keyに応じた関数呼出しをする方法」__の続編です。

###( 参考にした書籍 )
__(書籍)Julien Danjou(著)『Python ハッカーガイドブック』pp.142-143__所収のサンプルコードを拡張しました。

iPython(Python3.9.0)
functions_dict = {}

def register(f):
	global functions_dict
    functions_dict[f.__name__] = f
    return f 

@register
def sample_func1():
	return 'bar'

print(functions_dict['sample_func1'])
# 実行結果
<function sample_func1 at 0x1085bf940>

print(functions_dict['sample_func1']())
# 実行結果
bar

@register
def sample_func2():
	return 'foo'

print(functions_dict)
# 実行結果
{'sample_func1': <function sample_func1 at 0x1085bf940>, 'sample_func2': <function sample_func2 at 0x10843b550>}

print(functions_dict['sample_func2']())
# 実行結果
foo

###( 参考 )関数オブジェクト.__name__で関数名をstr型で取り出すことができる

iPython(Python3.9.0)
def sample_func1():
    return 'bar'

###関数名.__name__で、関数の名称をstr型オブジェクトとして取得できる。

iPython(Python3.9.0)
print(sample_func1.__name__)
# 実行結果
sample_func1

print(type(sample_func1.__name__))
# 実行結果
<class 'str'>


###以下はエラー

辞書オブジェクト[Key名]はエラー。
辞書オブジェクト['Key名']はOK。Keyはstr型オブジェクトを渡す必要があります。

iPython(Python3.9.0)
print(type(sample_func1.__name__))
# 実行結果
<class 'str'>

print(functions_dict[sample_func1])
# 実行結果
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-63-32923bc8e62e> in <module>
----> 1 print(functions_dict[sample_func1])

KeyError: <function sample_func1 at 0x1085bf940>

In [64]: print(functions_dict[sample_func1]())
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-64-af09e15405cf> in <module>
----> 1 print(functions_dict[sample_func1]())

KeyError: <function sample_func1 at 0x1085bf940>
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