元素字典

Question

我想編寫的代碼，將數據以這種格式

數據例如：

[['12319825', '39274', {'pH': 8.1}], ['12319825', '39610', {'pH': 7.27}], 
['12319825', '39638', {'pH': 7.87, 'Escherichia coli': 25.0}], 
['12319825', '39770', {'pH': 7.47, 'Escherichia coli': 27.0}], 
['12319825', '39967', {'pH': 8.36}], ['12319825', '39972', {'pH': 8.42}], 
['12319825', '39987', {'pH': 8.12, 'Escherichia coli': 8.0}], 
['12319825', '40014', {'pH': 8.12}], ['12319825', '40329',{'pH': 8.45}], 
['12319825', '40658', {'pH': 8.35, 'Escherichia coli': 6.3}], 
['12319825', '40686', {'pH': 8.17}], 
['12319825', '40714', {'pH': 8.13}], ['12319825', '40732', {'pH': 8.4}], 
['12319825', '40809', {'pH': 8.42}], 
['12319825', '40827', {'pH': 8.46}], 
['12319825', '41043', {'pH': 8.42, 'Escherichia coli': 170.0}], 
['12319825', '41071', {'pH': 8.24, 'Escherichia coli': 92.0}], 
['12319825', '41080', {'pH': 8.4}], 
['12319825', '41101', {'pH': 8.36, 'Escherichia coli': 560.0}], ['12319825', '41134', {'pH': 8.67}]] 

，並會返回一個字典，其中的關鍵是污染物（以這種情況下，無論是pH值還是大腸桿菌），這個值就是我所稱的DateList。日期列表將是格式（日期，T/F）的每個數據點的列表元組。如果該值在給定範圍之外的布爾將爲真，或在給定的值（取決於標準型）

rangeCriteria={'pH':(5.0,9.0)} 
convCriteria={'Echerichia coli':320) 

現在，當運行此代碼，每個字典具有用於這兩個值

def testLocationForConv(DataFromLocation): 
#checks if a pollutant is outside of acceptable values. 
#A dictionary is created where each pollutant has a cooresponding list of tuples 
#with the date and a corresponding boolean to say if it is in or out of 
#the criteria (true if out false if in) 
#It handles when the criteria is a minimum or range rather than a 
#maximum 

dateList=[] 
impairedList=[] 
overDict=dict() 
for date in DataFromLocation: 
    for pollutant in date[2]: 
     if pollutant in conventionalCriteriaList: 
      dateList.append((date[1],date[2][pollutant]>convCriteria[pollutant])) 
      overDict[pollutant]=dateList 
     if pollutant in rangeCriteria: 
      overDict[pollutant]=dateList 
      dateList.append((date[1], (not (float(date[2][pollutant])>rangeCriteria[pollutant][0] and float(date[2][pollutant])<rangeCriteria[pollutant][1])))) 
     #if pollutant in minCriteriaList: 
     # overDict[pollutant]=dateList 
      # dateList.append((date[1],date[2][pollutant]<minCriteria[pollutant]) 

     else: 
      pass 
print overDict 

現在，兩種污染物的數據點都添加到詞典中，得到以下結果。

{'pH': [('39274', False), ('39610', False), ('39638', False), 
('39638', False), ('39770', False), ('39770', False), ('39967', False), 
('39972', False), ('39987', False), ('39987', False), ('40014', False), 
('40329', False), ('40658', False), ('40658', False), ('40686', False), 
('40714', False), ('40732', False), ('40809', False), ('40827', False), 
('41043', False), ('41043', False), ('41071', False), ('41071', False), 
('41080', False), ('41101', False), ('41101', True), ('41134', False)], 
'Escherichia coli': [('39274', False), ('39610', False), ('39638', False), 
('39638', False), ('39770', False), ('39770', False), ('39967', False), 
('39972', False), ('39987', False), ('39987', False), ('40014', False), 
('40329', False), ('40658', False), ('40658', False), ('40686', False), 
('40714', False), ('40732', False), ('40809', False), ('40827', False), 
('41043', False), ('41043', False), ('41071', False), ('41071', False), 
('41080', False), ('41101', False), ('41101', True), ('41134', False)]} 

現在，我輸入了這個問題，我意識到這個問題是我迭代的日期，那麼污染物，但我想，編譯日期的名單，但獨立的污染物。我將如何製作這樣的清單並將其添加到字典中？

Answer 1

我會退後一步，想想你的方法。你讓自己變得更難。首先，數據：

In [3]: data = [['12319825', '39274', {'pH': 8.1}], ['12319825', '39610', {'pH': 
    ...: 7.27}], 
    ...: ['12319825', '39638', {'pH': 7.87, 'Escherichia coli': 25.0}], 
    ...: ['12319825', '39770', {'pH': 7.47, 'Escherichia coli': 27.0}], 
    ...: ['12319825', '39967', {'pH': 8.36}], ['12319825', '39972', {'pH': 8.42}] 
    ...: , 
    ...: ['12319825', '39987', {'pH': 8.12, 'Escherichia coli': 8.0}], 
    ...: ['12319825', '40014', {'pH': 8.12}], ['12319825', '40329',{'pH': 8.45}], 
    ...: 
    ...: ['12319825', '40658', {'pH': 8.35, 'Escherichia coli': 6.3}], 
    ...: ['12319825', '40686', {'pH': 8.17}], 
    ...: ['12319825', '40714', {'pH': 8.13}], ['12319825', '40732', {'pH': 8.4}], 
    ...: 
    ...: ['12319825', '40809', {'pH': 8.42}], 
    ...: ['12319825', '40827', {'pH': 8.46}], 
    ...: ['12319825', '41043', {'pH': 8.42, 'Escherichia coli': 170.0}], 
    ...: ['12319825', '41071', {'pH': 8.24, 'Escherichia coli': 92.0}], 
    ...: ['12319825', '41080', {'pH': 8.4}], 
    ...: ['12319825', '41101', {'pH': 8.36, 'Escherichia coli': 560.0}], ['123198 
    ...: 25', '41134', {'pH': 8.67}]] 

當你的布爾條件，哪怕是一點點複雜，你應該給他們自己的功能，如果只是爲了可讀性的原因。在這裏，我會走得更遠，並將它們添加到字典中，其中關鍵是相應的污染物，這將使您的生活變得非常簡單！

In [4]: def ecoli_threshold(value): return value > 320 

In [5]: def ph_range(value): return not (5 < value < 9) 

In [6]: test = {'Escherichia coli': ecoli_threshold, 'pH':ph_range} 

跳閘您的關鍵問題是，您使用的是單名單，但你真的需要。用兩個空列表初始化你的字典，因爲你知道你會追加到它們。

In [7]: over_dict = {'Escherichia coli':[], 'pH':[]} 

最後，遍歷數據：

In [8]: for entry in data: 
    ...:  for pollutant, value in entry[2].items(): 
    ...:   over_dict[pollutant].append((entry[1], test[pollutant](value))) 
    ...: 

最後，輸出：

In [9]: over_dict 
Out[9]: 
{'Escherichia coli': [('39638', False), 
    ('39770', False), 
    ('39987', False), 
    ('40658', False), 
    ('41043', False), 
    ('41071', False), 
    ('41101', True)], 
'pH': [('39274', False), 
    ('39610', False), 
    ('39638', False), 
    ('39770', False), 
    ('39967', False), 
    ('39972', False), 
    ('39987', False), 
    ('40014', False), 
    ('40329', False), 
    ('40658', False), 
    ('40686', False), 
    ('40714', False), 
    ('40732', False), 
    ('40809', False), 
    ('40827', False), 
    ('41043', False), 
    ('41071', False), 
    ('41080', False), 
    ('41101', False), 
    ('41134', False)]}