pandas 系列的真值是不明确的。使用 a.empty、a.bool()、a.item()、a.any() 或 a.all()
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The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all()
提问by Ron
my inputs are, data input at top
我的输入是，顶部的数据输入
Date Time Open High Low Close Volume
02/01/2015 14:30 79.52 79.73 79.52 79.71 10841
02/01/2015 14:31 79.6999 79.6999 79.61 79.67 1426
02/01/2015 14:32 79.69 79.7 79.69 79.7 800
02/01/2015 14:33 79.7 79.759 79.7 79.759 1158
02/01/2015 14:34 79.747 79.747 79.73 79.73 1125
02/01/2015 14:35 79.73 79.73 79.71 79.71 301
02/01/2015 14:36 79.8 79.82 79.75 79.82 7818
02/01/2015 14:37 79.82 79.83 79.778 79.82 6985
02/01/2015 14:38 79.8099 79.8099 79.72 79.72 1026
02/01/2015 14:39 79.77 79.78 79.7396 79.78 870
02/01/2015 14:40 79.79 79.79 79.73 79.73 12031
02/01/2015 14:41 79.76 79.76 79.6901 79.736 4642
02/01/2015 14:42 79.7301 79.744 79.7301 79.744 1099
numRow = 1
endRow = 50
dHaGreen0 = {}
for ticker in Index_tickers.ticker:
index_data = pd.read_csv('C:\Users\me\Dropbox\MktData\Index_list\' + ticker + '_' + str(timeFrame) + '.csv')
open0 = index_data.Open
close0 = index_data.Close
high0 = index_data.High
low0 = index_data.Low
dHaClose0 = (open0 + high0 + low0 + close0) / 4
dHaOpen0 = (dHaClose1 + dHaOpen1) / 2
dHaGreen0 = dHaClose0 >= dHaOpen0
if numRow < endRow:
dOpen0 = index_data.ix[numRow, index_data.Open]
if dHaGreen0 == True & dHaGreen1 == True:
dPosition = "Long"
numRow = numRow + 1
when I print dHaGreen0, it returns a list of bool, and "dtype: bool". But when I go to use dHaGreen0 in the if statement , I get the error ValueError:
当我打印 dHaGreen0 时，它返回一个 bool 列表和“dtype：bool”。但是当我在 if 语句中使用 dHaGreen0 时，出现错误 ValueError：
The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
系列的真值是不明确的。使用 a.empty、a.bool()、a.item()、a.any() 或 a.all()。
I have checked many of the suggested answers from previous questions but can't get read across. All responses are greatly appreciated.
我已经检查了以前问题中的许多建议答案，但无法阅读。非常感谢所有的回应。
回答by Chad Kennedy
The error you're seeing is correct. dHaGreen0 is an array of bool values. When you ask "dHaGreen0 == True", you need to decide on one of the two following interpretations:
您看到的错误是正确的。dHaGreen0 是一个布尔值数组。当您询问“dHaGreen0 == True”时，您需要决定以下两种解释之一：
Do you mean if anyvalue is dHaGreen0 is True? If so, replace "dHaGreen0 == True" with "any(dHaGreen0) == True".
你的意思是如果有任何值是 dHaGreen0 是真的吗？如果是这样，请将“dHaGreen0 == True”替换为“any(dHaGreen0) == True”。
Or do you mean if allvalues in dHaGreen0 are True? If so, replace "dHaGreen0 == True" with "all(dHaGreen0) == True".
或者您的意思是dHaGreen0 中的所有值是否都为 True？如果是这样，请将“dHaGreen0 == True”替换为“all(dHaGreen0) == True”。
Similarly for dHaGreen1
同样对于 dHaGreen1
If you're trying to do this for each pair:
如果您尝试为每一对执行此操作：
dPosition = dHaGreen0 & dHaGreen1
This will then give you an array of booleans giving the result for each pair.
然后这会给你一个布尔数组，给出每对的结果。
