Pandas :创建行以填补数字空白

Question

来自像这样的 DataFrame:

ref             from    to
abcd            1       2
efgh            2       4
ijkl            1       3
mnop            3       4
qrst            4       4
uvwx            4       6

想法是“填补空白”列 from 和 to 以获得:

ref             value
abcd            1
abcd            2
efgh            2
efgh            3
efgh            4
ijkl            1
ijkl            2
ijkl            3
mnop            3
mnop            4
qrst            4
uvwx            4
uvwx            5
uvwx            6

Answer 1

numpy 方法

r = df['ref'].values
f = df['from'].values
t = df['to'].values
pd.DataFrame(dict(
        ref=r.repeat(t - f + 1),
        value=np.concatenate([np.arange(f, t + 1) for f, t in zip(f, t)])
    ))

     ref  value
0   abcd      1
1   abcd      2
2   efgh      2
3   efgh      3
4   efgh      4
5   ijkl      1
6   ijkl      2
7   ijkl      3
8   mnop      3
9   mnop      4
10  qrst      4
11  uvwx      4
12  uvwx      5
13  uvwx      6

---

时间