我必须添加一个列，该列将增加新数据帧上的行数。我制作的解决方案大部分工作但不太好。首先，它耗费时间，其次，前两行包含新列的相同值（来自第2行的值）。这是我的源代码：
# time consuming!
c = 0
for l in range(0, len(data)):
dic = data.ix[l]
dic["Sample Type"] = "Trizol"
if int(dic["BoxPos"]) % 2 == 0:
for p in range(42, 82):
dic["Position"] = p
datatest.loc[c] = dic.values
c += 1
else:
for p in range(1, 41):
dic["Position"] = p
if l == 0 and p == 1:
datatest = pd.DataFrame(dic.to_frame().T)
c += 1
else:
datatest.loc[c] = dic.values
c += 1
以下是应用代码之前的数据框：
Out[147]:
RoomID RackID DonorID BoxPos FreezerID ShelfID Box
0 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1
1 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1
2 10_Magasin Rack 1 102202A 3 1532 Shelf 3 box 2
3 10_Magasin Rack 1 102162A 4 1532 Shelf 3 box 2
4 10_Magasin Rack 1 100122A 5 1532 Shelf 3 box 3
新数据框（仅显示两个第一捐赠者）：
Out[155]:
RoomID RackID DonorID BoxPos FreezerID ShelfID Box Sample Type \
0 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
1 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
2 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
3 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
4 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
5 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
6 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
7 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
8 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
9 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
10 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
11 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
12 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
13 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
14 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
15 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
16 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
17 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
18 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
19 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
20 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
21 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
22 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
23 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
24 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
25 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
26 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
27 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
28 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
29 10_Magasin Rack 1 101122A 1 1532 Shelf 3 box 1 Trizol
.. ... ... ... ... ... ... ... ...
50 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
51 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
52 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
53 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
54 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
55 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
56 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
57 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
58 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
59 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
60 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
61 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
62 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
63 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
64 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
65 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
66 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
67 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
68 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
69 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
70 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
71 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
72 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
73 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
74 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
75 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
76 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
77 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
78 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
79 10_Magasin Rack 1 101112A 2 1532 Shelf 3 box 1 Trizol
Position
0 2
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
.. ...
50 52
51 53
52 54
53 55
54 56
55 57
56 58
57 59
58 60
59 61
60 62
61 63
62 64
63 65
64 66
65 67
66 68
67 69
68 70
69 71
70 72
71 73
72 74
73 75
74 76
75 77
76 78
77 79
78 80
79 81
我的algortihm有效，但我很确定存在更好的解决方案。我还试图纠正位置列的错误，但我确实管理了什么错误。你们中的任何人都知道如何在代码上增加这一部分吗？
提前致谢。