[teratailの質問] 複数の特定のkeyを取り除いた辞書を作る効率的な方法

effective_way_of_removing_keys_from_dictionary.py

# https://teratail.com/questions/337003

unnecessary_keys = ('s', 'd', 't', 'step', 'duration', 'transition', )
intersection = set(unnecessary_keys).intersection

def method_1(d):
    d = d.copy()
    for key in unnecessary_keys:
        d.pop(key, None)
    return d


def method_2(d):
    return {
        key: value for key, value in d.items()
        if key not in unnecessary_keys
    }


def method_3a(d):
    '''ppaulさんのmethod_3に少し手を加えた物'''
    d = d.copy()
    for key in intersection(d):
        d.__delitem__(key)
    return d


def method_3b(d):
    '''method_3aの'd.__delitem__'をloopの外に出した物'''
    d = d.copy()
    delitem = d.__delitem__
    for key in intersection(d):
        delitem(key)
    return d


def method_4a(d):
    '''ppaulさんのmethod_4'''
    d = d.copy()
    for key in unnecessary_keys:
        if key in d:
            d.__delitem__(key)
    return d


def method_4b(d):
    '''method_4aの'd.__delitem__'をloopの外に出した物'''
    d = d.copy()
    delitem = d.__delitem__
    for key in unnecessary_keys:
        if key in d:
            delitem(key)
    return d


def method_5(d):
    '''quickquipさんの方法'''
    d = d.copy()
    for key in unnecessary_keys:
        if key in d:
            del d[key]
    return d


def method_6(d):
    '''quickquipさんの方法'''
    d = d.copy()
    for key in intersection(d):
        del d[key]
    return d


sample_dict = {
    'x': 100,
    'y': 200,
    'd': 10,
    'transition': 'in_cubic',
}


assert method_1(sample_dict) == {'x': 100, 'y': 200, }
assert method_2(sample_dict) == {'x': 100, 'y': 200, }
assert method_3a(sample_dict) == {'x': 100, 'y': 200, }
assert method_3b(sample_dict) == {'x': 100, 'y': 200, }
assert method_4a(sample_dict) == {'x': 100, 'y': 200, }
assert method_4b(sample_dict) == {'x': 100, 'y': 200, }
assert method_5(sample_dict) == {'x': 100, 'y': 200, }
assert method_6(sample_dict) == {'x': 100, 'y': 200, }

from timeit import timeit

print('1 :', timeit(lambda: method_1(sample_dict)))
print('2 :', timeit(lambda: method_2(sample_dict)))
print('3a:', timeit(lambda: method_3a(sample_dict)))
print('3b:', timeit(lambda: method_3b(sample_dict)))
print('4a:', timeit(lambda: method_4a(sample_dict)))
print('4b:', timeit(lambda: method_4b(sample_dict)))
print('5 :', timeit(lambda: method_5(sample_dict)))
print('6 :', timeit(lambda: method_6(sample_dict)))