KeyError：“错误：在没有布尔索引的情况下无法使用布尔标签”Pandas 数据框中

Question

命令是“要求用户输入他想要接收数据的对象的名称和过滤器的名称， 您需要的数据（可以引入多个过滤器）。”

这是我的数据：

|Object |   HJD 24... |    Filter | Magnitude|
|-------|-------------|-----------|----------|
|SU_Hor | 55896.30476 |    B      |14.877    |
SU_Hor    55896.27438     Ic      13.885
SU_Hor    55896.27349      B      14.809
SU_Hor    55896.27397      V      14.434
SU_Hor    55896.40882     Ic      14.033
SU_Hor    55896.40829      V      14.540
SU_Hor    55896.40770      B      14.941
SU_Hor    55896.34973     Ic      13.958
SU_Hor    55896.34943      V      14.494
SU_Hor    55896.34906      B      14.861
SU_Hor    55896.30542     Ic      13.912
SU_Hor    55896.30512      v      14.440
SU_Hor    55897.38547      V      14.536
SU_Hor    55897.28281      B      14.882
SU_Hor    55897.28317      V      14.428
SU_Hor    55897.28347     Ic      13.927
RZ_Lyr    27359.3030       V      10.630
RZ_Lyr    27684.4510       V      10.610
RZ_Lyr    27685.4780       V      10.580
RZ_Lyr    27701.3150       V      10.700
RZ Lyr    27934.4560       V      10.660
RZ Lyr    27955.4100       V      10.570
rzlyr     30604.2000       V      11.030
RZ_Lyr    55314.5695       B      12.047
RZ_Lyr    55314.5724       B      12.036
RZ_Lyr    55314.5900       B      12.042
RZ_Lyr    55314.6105       B      12.045
RZ_Lyr    55314.6163       B      12.027
RZ_Lyr    55342.3509       B      12.057
RZLyr     55342.3557       B      12.058
RZ_Lyr    55342.3606       B      12.052
RZ_Lyr    55342.3654       B      12.058

这是我的代码：

def searchByfilter():
    filter = input('Enter filter to show data \n')
    df = pd.read_csv('Python_2ndLab.csv')
    print(df.loc[df.filter == filter, :])

print('Enter 1 to search by object name')
print('Enter 2 to search by filter')

src = (input('Enter here: '))

if src == '1':
    searchByObject()
elif src == '2':
    searchByfilter()
else:
    print('Sorry, invalid input')

我正在尝试解决，但仍然没有成功，并且出现错误：

Enter 2 to search by filter
Enter here: 2
Enter filter to show data 
B
Traceback (most recent call last):
  File "C:\Users\Acer\PycharmProjects\2nd Lab\main.py", line 78, in <module>
    searchByfilter()
  File "C:\Users\Acer\PycharmProjects\2nd Lab\main.py", line 64, in searchByfilter
    print(df.loc[df.filter == filter, :])
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexing.py", line 1067, in __getitem__
    return self._getitem_tuple(key)
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexing.py", line 1247, in _getitem_tuple
    return self._getitem_lowerdim(tup)
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexing.py", line 967, in _getitem_lowerdim
    section = self._getitem_axis(key, axis=i)
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexing.py", line 1311, in _getitem_axis
    self._validate_key(key, axis)
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexing.py", line 1118, in _validate_key
    raise KeyError(
KeyError: 'False: boolean label can not be used without a boolean index'

当我输入“B”时，我希望收到来自所有“B”过滤器的数据

Answer 1

filter

是一种dataframe方法。将

df.filter

替换为

df['filter']

。

https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.filter.html