在Python中通过嵌套字典循环

使用一个名为listen dict_total的主词典，此代码将起作用. out_region =无out_value =无sel_serie ='孕产妇死亡率(每十万人口的死亡人数)'min_year = 2005max_year = 2015对于reg，在dict_total.items()中为dict_reg:打印(reg)对于dict_reg.items()中的dict_year:如果min_year< =年< = max_year:印刷(年)对于意甲，在dict_year.items()中的值:如果serie == sel_serie且值不为None:print('{} {}'.format(serie，value))如果out_value为None或out_value<价值:out_value =值out_region = regprint('Region:{} \ nSerie:{} Value:{}'.format(out_region，sel_serie，out_value)) So I need help looping thru a nested dictionaries that i have created in order to answer some problems. My code that splits up the 2 different dictionaries and adds items into them is as follows:Link to csv :https://docs.google.com/document/d/1v68_QQX7Tn96l-b0LMO9YZ4ZAn_KWDMUJboa6LEyPr8/edit?usp=sharingimport csvregion_data = {}country_data = {}answers = []data = []cuntry = Falsef = open('dph_SYB60_T03_Population Growth, Fertility and Mortality Indicators.csv')reader = csv.DictReader(f)for line in reader: #This gets all the values into a standard dict data.append(dict(line))#This will loop thru the dict and create variables to hold specific itemsfor i in data: # collects all of the Region/Country/Area location = i['Region/Country/Area'] # Gets All the Years years = i['Year'] i_d = i['ID'] info = i['Footnotes'] series = i['Series'] value = float(i['Value']) # print(series) stats = {i['Series']:i['Value']} # print(stats) # print(value) if (i['ID']== '4'): cuntry = True if cuntry == True: if location not in country_data: country_data[location] = {} if years not in country_data[location]: country_data[location][years] = {} if series not in country_data[location][years]: country_data[location][years][series] = value else: if location not in region_data: region_data[location] = {} if years not in region_data[location]: region_data[location][years] = {} if series not in region_data[location][years]: region_data[location][years][series] = valueWhen I print the dictionary region_data output is:For Clarification What is shown is a "Region" as a key in a dict. The years being Values and keys in that 'Region's Dict and so on so forth....I want to understand how i can loop thru the data and answer a question like :Which region had the largest numeric decrease in Maternal mortality ratio from 2005 to 2015?Were "Maternal mortality ratio (deaths per 100,000 population)" is a key within the dictionary. 解决方案 If you prefer to loop throught dictionaries in Python 3.x you can use the method .items() from each dictionary and nest them with three loops.With a main dictionary called hear dict_total, this code will work it.out_region = Noneout_value = Nonesel_serie = 'Maternal mortality ratio (deaths per 100,000 population)'min_year = 2005max_year = 2015for reg, dict_reg in dict_total.items(): print(reg) for year, dict_year in dict_reg.items(): if min_year <= year <= max_year: print(year) for serie, value in dict_year.items(): if serie == sel_serie and value is not None: print('{} {}'.format(serie, value)) if out_value is None or out_value < value: out_value = value out_region = reg print('Region: {}\nSerie: {} Value: {}'.format(out_region, sel_serie, out_value)) 这篇关于在Python中通过嵌套字典循环的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！