[Python] KeyError: 'False: boolean label can not be used without a boolean index' in Pandas...

the order is "Ask the user to enter the name of the object for which he wants to receive data and the names of the filters, data in which you need (it is possible to introduce several filters)."

here is my data:

|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


this is my code:

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')


I'm trying to solve but still didn't work and I got an error:

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'


I expected to receive the data from all of the "B" filter when I enter "B"

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