KeyError：'Filter'（從數據幀接收特定數據）

Question

因此，命令是“要求用戶輸入他想要為其接收數據的對象的名稱和過濾器的名稱，以及您需要的數據（可以引入多個過濾器）。”

這是我的數據：

目的	滬京東24...	篩選	震級
SU_Hor	55896.30476	乙	14.877
SU_Hor	55896.27438	我知道了	13.885
SU_Hor	55896.27349	乙	14.809
SU_Hor	55896.27397	V	14.434
SU_Hor	55896.40882	我知道了	14.033
SU_Hor	55896.40829	V	14.540
SU_Hor	55896.40770	乙	14.941
SU_Hor	55896.34973	我知道了	13.958
SU_Hor	55896.34943	V	14.494
SU_Hor	55896.34906	乙	14.861
SU_Hor	55896.30542	我知道了	13.912
SU_Hor	55896.30512	v	14.440
SU_Hor	55897.38547	V	14.536
SU_Hor	55897.28281	乙	14.882
SU_Hor	55897.28317	V	14.428
SU_Hor	55897.28347	我知道了	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天琴座	27934.4560	V	10.660
RZ天琴座	27955.4100	V	10.570
回復	30604.2000	V	11.030
RZ_Lyr	55314.5695	乙	12.047
RZ_Lyr	55314.5724	乙	12.036
RZ_Lyr	55314.5900	乙	12.042
RZ_Lyr	55314.6105	乙	12.045
RZ_Lyr	55314.6163	乙	12.027
RZ_Lyr	55342.3509	乙	12.057
RZLyr	55342.3557	乙	12.058
RZ_Lyr	55342.3606	乙	12.052
RZ_Lyr	55342.3654	乙	12.058

這是我的代碼：

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')

因此，在輸出中，我輸入“2”以按過濾器搜索，然后輸出要求輸入過濾器名稱，然后我輸入“B”，但我收到的不是來自 B 過濾器的數據，而是錯誤。

Name: Filter, dtype: object
Enter 1 to search by object name
Enter 2 to search by filter
Enter here: 2
Enter filter to show data 
B

這是錯誤：

Traceback (most recent call last):
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexes\base.py", line 3803, in get_loc
    return self._engine.get_loc(casted_key)
  File "pandas\_libs\index.pyx", line 138, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\index.pyx", line 165, in pandas._libs.index.IndexEngine.get_loc
  File "pandas\_libs\hashtable_class_helper.pxi", line 5745, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas\_libs\hashtable_class_helper.pxi", line 5753, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'Filter'

The above exception was the direct cause of the following exception:

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\frame.py", line 3805, in __getitem__
    indexer = self.columns.get_loc(key)
  File "C:\Users\Acer\AppData\Local\Programs\Python\Python310\lib\site-packages\pandas\core\indexes\base.py", line 3805, in get_loc
    raise KeyError(key) from err
KeyError: 'Filter'

誰能幫我調試一下？ 我真的不知道錯誤在哪里。

Answer 1

我在下面運行了你的代碼，一切都對我有用

import pandas as pd

def searchByFilter():
    filter = input('Enter filter to show data \n')
    df = pd.DataFrame({"Dummy":[1,2,3,4,5],
                       "Filter":["A","B","C","D","E"]})
    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':
    None
elif src == '2':
    searchByFilter()
else:
    print('Sorry, invalid input')

-----------------------------------

Enter 1 to search by object name
Enter 2 to search by filter
Enter here: 2
Enter filter to show data 
B
   Dummy Filter
1      2      B

關鍵錯誤表明您的“Python_2ndLab.csv”文件標題的格式可能與預期不完全一樣。 再次檢查文件並確保沒有任何可能導致此問題的前導或尾隨空格。 在文本編輯器而不是 excel 中打開 CSV 可以更容易地發現這些內容。