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<title>(python중급) 깔끔하게 함수 리모델링해보자! itemgetter, attrgetter, methodcaller, partial</title>
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<meta property="og:description" content="Keyword : operator, itemmgetter, attrgetter, methodcaller Operator python operator 모듈 안에는 다양한 함수들이 있음 활용해서 가독성 있는 코딩이 가능함 itemgetter index가 정해져있는 함수를 반환함 arr = ['a', 'b', 'c'] func = itemgetter(2) func(arr) >>> 'b' attrgetter class의 attribute이름을 특정하면 그 attribute를 반환 f = attrgetter('name') f(b) >> b.name 여러개의 attribute나" />
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<h1 class="post-full-title">(python중급) 깔끔하게 함수 리모델링해보자! itemgetter, attrgetter, methodcaller, partial</h1>
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<p>Keyword : operator, itemmgetter, attrgetter, methodcaller</p>
</blockquote>
<h3 id="operator">Operator</h3>
<ul>
<li>python operator 모듈 안에는 다양한 함수들이 있음</li>
<li>활용해서 가독성 있는 코딩이 가능함</li>
</ul>
<h3 id="itemgetter">itemgetter</h3>
<ul>
<li>index가 정해져있는 함수를 반환함</li>
</ul>
<pre><code class="language-angular2html">arr = ['a', 'b', 'c']
func = itemgetter(2)
func(arr)
>>> 'b'
</code></pre>
<h3 id="attrgetter">attrgetter</h3>
<ul>
<li>class의 attribute이름을 특정하면 그 attribute를 반환</li>
</ul>
<pre><code class="language-angular2html">f = attrgetter('name')
f(b)
>> b.name
</code></pre>
<ul>
<li>여러개의 attribute나 중첩된 attribute 형태도 가능함</li>
</ul>
<h3 id="methodcaller">methodcaller</h3>
<ul>
<li>class의 method 특정해서 그 결과값을 반환</li>
<li>*args, **kwargs 등을 입력해서 해당 method input을 바로 입력하는 것도 가능!</li>
</ul>
<pre><code class="language-angular2html"> f = methodcaller('name', 'foo', bar=1)
f(b)
>>> b.name('foo', bar=1)
</code></pre>
<h2 id="functoolspartial">functools.partial</h2>
<ul>
<li>하나 이상의 인수가 채워진 또 하나의 함수를 만드는 데 사용</li>
<li>불필요한 반복작업 줄임</li>
</ul>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code># 첫 인자에 따라 더하기도 하고, 곱하기도 하는 함수
def add_mul(choice, *args):
if choice == "add":
result = 0
for i in args:
result = result + i
elif choice == "mul":
result = 1
for i in args:
result = result * i
return result
# 더하는 함수를 만드는 일반적인 풀이
def add(*args):
return add_mul('add', *args)
# partial 사용할 경우 간결해진다!
add = partial(add_mul, 'add')
</code></pre></div></div>
<h3 id="회고">회고</h3>
<ul>
<li>코드 가독성을 높이는 데 좋을 듯 하다.</li>
<li>다른 여러 사칙.논리 연산 등에도 유용해 보인다(공식문서 참고).</li>
<li>partial은 활용도가 높아 보인다.</li>
</ul>
<h2 id="reference">Reference</h2>
<ul>
<li>https://docs.python.org/3/library/operator.html</li>
<li>https://wikidocs.net/109304</li>
</ul>
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