我正在尝试基于另一列的条件逻辑创建一个新列。我已经尝试过搜索,但却找不到能解决我问题的任何内容。
我已将CSV导入到pandas数据框中,其结构如下。我编辑了这篇文章的一些描述,但除此之外一切都是一样的:
#code used to load dataframe:
df = pd.read_csv(r"C:\filepath\filename.csv")
#output from print(type(df)):
#class 'pandas.core.frame.DataFrame'
#output from print(df.columns.values):
#['Type' 'Trans Date' 'Post Date' 'Description' 'Amount']
#output from print(df.columns):
Index(['Type', 'Trans Date', 'Post Date', 'Description', 'Amount'], dtype='object')
#output from print
Type Trans Date Post Date Description Amount
0 Sale 01/25/2018 01/25/2018 DESC1 -13.95
1 Sale 01/25/2018 01/26/2018 AMAZON MKTPLACE PMTS -6.99
2 Sale 01/24/2018 01/25/2018 SUMMIT BISTRO -5.85
3 Sale 01/24/2018 01/25/2018 DESC3 -9.13
4 Sale 01/24/2018 01/26/2018 DYNAMIC VENDING INC -1.60
然后我写下面的代码:
def criteria(row):
if row.Description.find('SUMMIT BISTRO')>0:
return 'Lunch'
elif row.Description.find('AMAZON MKTPLACE PMTS')>0:
return 'Amazon'
elif row.Description.find('Aldi')>0:
return 'Groceries'
else:
return 'NotWorking'
df['Category'] = df.apply(criteria, axis=0)
错误:
Traceback (most recent call last):
File "C:\Users\Test_BankReconcile2.py", line 44, in <module>
df['Category'] = df.apply(criteria, axis=0)
File "C:\Users\Anaconda3\lib\site-packages\pandas\core\frame.py", line 4262, in apply
ignore_failures=ignore_failures)
File "C:\Users\Anaconda3\lib\site-packages\pandas\core\frame.py", line 4358, in _apply_standard
results[i] = func(v)
File "C:\Users\OneDrive\Documents\finance\Test_BankReconcile2.py", line 35, in criteria
if row.Description.find('SUMMIT BISTRO')>0:
File "C:\Users\Anaconda3\lib\site-packages\pandas\core\generic.py", line 3081, in __getattr__
return object.__getattribute__(self, name)
AttributeError: ("'Series' object has no attribute 'Description'", 'occurred at index Type')
我能够在一个来自不同银行的非常相似的csv文件上成功执行同样的命令(这个例子来自我的信用卡),所以我不知道发生了什么,但我可能需要以某种方式定义数据帧,我不是在做什么?或者可能是我没有看到的其他非常明显的东西?提前谢谢大家帮我解决这个问题。
答案 0 :(得分:2)
是的,您的问题是您需要将axis=1
传递给.apply
:
In [52]: df
Out[52]:
Type Trans Date Post Date Description Amount
0 Sale 01/25/2018 01/25/2018 DESC1 -13.95
1 Sale 01/25/2018 01/26/2018 AMAZON MKTPLACE PMTS -6.99
2 Sale 01/24/2018 01/25/2018 SUMMIT BISTRO -5.85
3 Sale 01/24/2018 01/25/2018 DESC3 -9.13
4 Sale 01/24/2018 01/26/2018 DYNAMIC VENDING INC -1.60
In [53]: def criteria(row):
...: if row.Description.find('SUMMIT BISTRO')>0:
...: return 'Lunch'
...: elif row.Description.find('AMAZON MKTPLACE PMTS')>0:
...: return 'Amazon'
...: elif row.Description.find('Aldi')>0:
...: return 'Groceries'
...: else:
...: return 'NotWorking'
...:
In [54]: df.apply(criteria, axis=1)
Out[54]:
0 NotWorking
1 NotWorking
2 NotWorking
3 NotWorking
4 NotWorking
dtype: object
第二个问题是你有一个逻辑错误,而不是.find(x) > 0
你想要.find(x) >= 0
,或者更好,some_string in some_other_string
答案 1 :(得分:1)
对于更一般的解决方案,请在循环中省略Description
,而是将df['Description'].apply(criteria)
与Series.apply
一起使用。
对于字符串中的check子字符串,请使用in
。
def criteria(row):
if 'SUMMIT BISTRO' in row:
return 'Lunch'
elif 'AMAZON MKTPLACE PMTS' in row:
return 'Amazon'
elif 'Aldi' in row:
return 'Groceries'
else:
return 'NotWorking'
df['Category'] = df['Description'].apply(criteria)