我有三个数据集(final_NN
,ppt_code
,herd_id
),我希望在final_NN
数据帧中添加一个名为MapValue
的新列,要添加的值可以从其他两个数据帧中检索,规则在代码后的底部
import pandas as pd
final_NN = pd.DataFrame({
"number": [123, 456, "Unknown", "Unknown", "Unknown", "Unknown", "Unknown", "Unknown", "Unknown", "Unknown"],
"ID": ["", "", "", "", "", "", "", "", 799, 813],
"code": ["", "", "AA", "AA", "BB", "BB", "BB", "CC", "", ""]
})
ppt_code = pd.DataFrame({
"code": ["AA", "AA", "BB", "BB", "CC"],
"number": [11, 11, 22, 22, 33]
})
herd_id = pd.DataFrame({
"ID": [799, 813],
"number": [678, 789]
})
new_column = pd.Series([])
for i in range(len(final_NN)):
if final_NN["number"][i] != "" and final_NN["number"][i] != "Unknown":
new_column[i] = final_NN['number'][i]
elif final_NN["code"][i] != "":
for p in range(len(ppt_code)):
if ppt_code["code"][p] == final_NN["code"][i]:
new_column[i] = ppt_code["number"][p]
elif final_NN["ID"][i] != "":
for h in range(len(herd_id)):
if herd_id["ID"][h] == final_NN["ID"][i]:
new_column[i] = herd_id["number"][h]
else:
new_column[i] = ""
final_NN.insert(3, "MapValue", new_column)
print(final_NN)
最后:
number ID code
0 123
1 456
2 Unknown AA
3 Unknown AA
4 Unknown BB
5 Unknown BB
6 Unknown BB
7 Unknown CC
8 Unknown 799
9 Unknown 813
ppt_代码:
code number
0 AA 11
1 AA 11
2 BB 22
3 BB 22
4 CC 33
兽群识别码:
ID number
0 799 678
1 813 789
预期产出:
number ID code MapValue
0 123 123
1 456 456
2 Unknown AA 11
3 Unknown AA 11
4 Unknown BB 22
5 Unknown BB 22
6 Unknown BB 22
7 Unknown CC 33
8 Unknown 799 678
9 Unknown 813 789
规则是:
number
不是Unknown
,则MapValue
=number
在final_NN
中李>number
为Unknown
,但final_NN
中的code
不为空,则搜索ppt_代码数据帧,并使用code
及其对应的“编号”映射并填写final_NN
中的“映射值”李>
我们只是简单地组合了三个数据帧
首先从} 创建一个新列} 和^{} 来填充
ppt_code
和herd_id
数据帧创建一个映射系列,然后使用^{MapNumber
,方法是将number
列中的Unknown
值替换为np.NaN
,然后根据规则使用两个连续的^{MapNumber
列中缺少的值:结果:
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