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Pandas

serius辞書に要素の追加

2017年11月25日 by 河副 太智 Leave a Comment

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<span role="presentation"><span class="cm-keyword">port</span> <span class="cm-variable">pandas</span> <span class="cm-keyword">as</span> <span class="cm-variable">pd</span></span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-variable">index</span> = [<span class="cm-string">"a"</span>, <span class="cm-string">"b"</span>, <span class="cm-string">"c"</span>, <span class="cm-string">"d"</span>, <span class="cm-string">"e"</span>]</span>

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<span role="presentation"><span class="cm-variable">data</span> = [<span class="cm-number">10</span>, <span class="cm-number">5</span>, <span class="cm-number">8</span>, <span class="cm-number">12</span>, <span class="cm-number">3</span>]</span>

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<span role="presentation"><span class="cm-variable">series</span> = <span class="cm-variable">pd</span>.<span class="cm-property">Series</span>(<span class="cm-variable">data</span>, <span class="cm-variable">index</span>=<span class="cm-variable">index</span>)</span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-comment"># seriesに、インデックスが"pineapple"、データが12の要素を追加してください。</span></span>

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<span role="presentation"><span class="cm-variable">pineapple</span> = <span class="cm-variable">pd</span>.<span class="cm-property">Series</span>([<span class="cm-number">12</span>], <span class="cm-variable">index</span>=[<span class="cm-string">"f"</span>])</span>

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<span role="presentation"><span class="cm-variable">series</span> = <span class="cm-variable">series</span>.<span class="cm-property">append</span>(<span class="cm-variable">pineapple</span>)</span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-builtin">print</span>(<span class="cm-variable">series</span>)</span>
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a    10
b     5
c     8
d    12
e     3
f    12
dtype: int64

Filed Under: Pandas

seriusで辞書内の値やインデックスのみ分解して取り出す

2017年11月25日 by 河副 太智 Leave a Comment

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<span role="presentation"><span class="cm-keyword">import</span> <span class="cm-variable">pandas</span> <span class="cm-keyword">as</span> <span class="cm-variable">pd</span></span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-variable">index</span> = [<span class="cm-string">"apple"</span>, <span class="cm-string">"orange"</span>, <span class="cm-string">"banana"</span>, <span class="cm-string">"strawberry"</span>, <span class="cm-string">"kiwifruit"</span>]</span>

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<span role="presentation"><span class="cm-variable">data</span> = [<span class="cm-number">10</span>, <span class="cm-number">5</span>, <span class="cm-number">8</span>, <span class="cm-number">12</span>, <span class="cm-number">3</span>]</span>

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<span role="presentation"><span class="cm-variable">series</span> = <span class="cm-variable">pd</span>.<span class="cm-property">Series</span>(<span class="cm-variable">data</span>, <span class="cm-variable">index</span>=<span class="cm-variable">index</span>)</span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-comment"># valuesにseriesのデータを代入</span></span>

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<span role="presentation"><span class="cm-variable">values</span>= <span class="cm-variable">series</span>.<span class="cm-property">values</span></span>

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<span role="presentation">​結果
[10 5 8 12 3]
</span>

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<span role="presentation"><span class="cm-comment"># indexにseriesのインデックスを代入してください</span></span>

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<span role="presentation"><span class="cm-variable">index</span> =<span class="cm-variable">series</span>.<span class="cm-property">index</span></span>
 結果
 Index([‘apple’, ‘orange’, ‘banana’, ‘strawberry’, ‘kiwifruit’], dtype=’object’)
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Filed Under: Pandas

Seriesで辞書の値や要素を取り出す

2017年11月25日 by 河副 太智 Leave a Comment

文字と数字を組み合わせた辞書の作成が可能

 

index = [“cup”, “chair”, “table”, “kagaku”, “pictre”]
data = [7012, 9406, 9609, 3824,9701]

# indexとdataを含むSeriesを作成しseriesに代入
series = pd.Series(data,index=index)

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cup       7012
chair     9406
table     9609
kagaku    3824
pictre    9701
dtype: int64

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-comment"># インデックス参照を用いてseriesの2つ目から4つ目までの3つの要素を取り出してitems1に代入</span></span>

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<span role="presentation"><span class="cm-variable">items1</span> = <span class="cm-variable">series</span>[<span class="cm-number">1</span>:<span class="cm-number">4</span>]
 
結果
 
orange 5
</span>banana 8
strawberry 12
dtype: int64

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-comment"># インデックス値を指定する方法を用いて"apple", "banana", "kiwifruit"のインデックスと持つ要素を取り出してitems2に代入
 
</span></span><span role="presentation"><span class="cm-variable">items2</span>=<span class="cm-variable">series</span>[[<span class="cm-string">"apple"</span>,<span class="cm-string">"banana"</span>,<span class="cm-string">"kiwifruit"</span>]]</span>

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<span role="presentation">​</span>

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結果

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apple        10
banana        8
kiwifruit     3
dtype: int64

Filed Under: Pandas

Seriesで文字列と数値のリストを統合、合体

2017年11月25日 by 河副 太智 Leave a Comment

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<span role="presentation"><span class="cm-keyword">import</span> <span class="cm-variable">pandas</span> <span class="cm-keyword">as</span> <span class="cm-variable">pd</span></span>

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<span role="presentation">​</span><span role="presentation">​</span>

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<span role="presentation"><span class="cm-variable">index</span> = [<span class="cm-string">"cup"</span>, <span class="cm-string">"chair"</span>, <span class="cm-string">"table"</span>, <span class="cm-string">"kagaku"</span>, <span class="cm-string">"pictre"</span>]</span>

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<span role="presentation"><span class="cm-variable">data</span> = [7012, 9406, 9609, <span class="cm-number">12</span>, 3824,9701]</span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-comment"># indexとdataを含むSeriesを作成しseriesに代入</span></span>

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<span role="presentation"><span class="cm-variable">series</span> = <span class="cm-variable">pd</span>.<span class="cm-property">Series</span>(<span class="cm-variable">data</span>,<span class="cm-variable">index</span>=<span class="cm-variable">index</span>)</span>

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<span role="presentation">​</span>

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<span role="presentation"><span class="cm-builtin">print</span>(<span class="cm-variable">series</span>)</span>
 #出力結果
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apple         10
orange         5
banana         8
strawberry    12
kiwifruit      3
dtype: int64

Filed Under: Pandas

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