我是python的新手,我正在对两个相似的SFrame执行基本的EDA分析。我有一个字典作为我的两列,我试图找出每个字典的最大值是否相同。最后,我想总结一下Value_Match列,以便我可以知道有多少个值匹配,但是我收到了一个令人讨厌的错误,但我一直无法找到源代码。奇怪的是,我对两个SFrame都使用了相同的方法,只有其中一个给我这个错误,而不是另一个。在Python中使用sum()时出错SFrame
我试图这里给出,但同样的错误一直坚持以不同的方式计算max_func:getting-key-with-maximum-value-in-dictionary
我已经检查了列中的任何可能的NaN值,但没有发现任何人。
我一直坚持这一段时间,任何帮助将不胜感激。谢谢!
代码:
def max_func(d):
v=list(d.values())
k=list(d.keys())
return k[v.index(max(v))]
sf['Max_Dic_1'] = sf['Dic1'].apply(max_func)
sf['Max_Dic_2'] = sf['Dic2'].apply(max_func)
sf['Value_Match'] = sf['Max_Dic_1'] == sf['Max_Dic_2']
sf['Value_Match'].sum()
错误:
RuntimeError Traceback (most recent call last)
<ipython-input-70-f406eb8286b3> in <module>()
----> 1 x = sf['Value_Match'].sum()
2 y = sf.num_rows()
3
4 print x
5 print y
C:\Users\rakesh\Anaconda2\lib\site-
packages\graphlab\data_structures\sarray.pyc in sum(self)
2216 """
2217 with cython_context():
-> 2218 return self.__proxy__.sum()
2219
2220 def mean(self):
C:\Users\rakesh\Anaconda2\lib\site-packages\graphlab\cython\context.pyc in
__exit__(self, exc_type, exc_value, traceback)
47 if not self.show_cython_trace:
48 # To hide cython trace, we re-raise from here
---> 49 raise exc_type(exc_value)
50 else:
51 # To show the full trace, we do nothing and let
exception propagate
RuntimeError: Runtime Exception. Exception in python callback function
evaluation:
ValueError('max() arg is an empty sequence',):
Traceback (most recent call last):
File "graphlab\cython\cy_pylambda_workers.pyx", line 426, in
graphlab.cython.cy_pylambda_workers._eval_lambda
File "graphlab\cython\cy_pylambda_workers.pyx", line 169, in
graphlab.cython.cy_pylambda_workers.lambda_evaluator.eval_simple
File "<ipython-input-63-b4e3c0e28725>", line 4, in max_func
ValueError: max() arg is an empty sequence
错误不在'sum'本身。 'max_func'应用懒惰,问题是对于一个emty字典,没有'max' ... –