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問【6】についての別解
df.select(pl.all().sort_by('fare'))
が模範解答となっていますが、
df.sort('fare')
のほうが書き方が簡単ではないでしょうか?
パット見同じ挙動に見えます。
問【34】についての別解
for col in df.columns:
print(col, df[col].n_unique())
よりも
df.select(pl.all().n_unique())
のほうが簡潔かもしれないです。
問【69】【70】表現のご相談
例えば、69では問題文が「df2にdf3を、df3にのみ存在するデータのみを残してて結合」となっていますが、
答えであるdf2.join(df3, on='name', how='semi')
の実行結果は、df3と結合したものではありません。
実質的には、df3に登場するkeyに一致する行を残したdf2 だと思う(df2に対するfilter操作に近い)のですがどう表現したら良いのか迷いますね
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