[英]Iterate a Nested Dictionary in Python
我的字典結構如下:
stockData = {
'AAPL': {
'beta': 1.01833975315094,
'company_name': 'Apple',
'dividend': 1.9341673320912078,
'total':300},
'GOOG': {
'beta': 1.01833975315094,
'company_name': 'Apple',
'dividend': 1.9341673320912078,
'total':300}
}
這是我分配值的區域:
for row in range(2, sheet.max_row + 1):
# Each row in the spreadsheet has data for one census tract.
company_name = sheet['A' + str(row)].value
ticker = sheet['B' + str(row)].value
sector = sheet['C' + str(row)].value
shares = sheet['D' + str(row)].value
price = sheet['E' + str(row)].value
total = sheet['F' + str(row)].value
beta = sheet['G' + str(row)].value
dividend = sheet['H' + str(row)].value
number_stocks+=1
# Make sure the key for this ticker exists.
stockData.setdefault(ticker,{})
stockData[ticker]['company_name'] = company_name
stockData[ticker]['sector'] = sector
stockData[ticker]['shares'] = shares
stockData[ticker]['price'] = price
stockData[ticker]['total'] = total
stockData[ticker]['dividend'] = dividend
stockData[ticker]['beta'] = beta
我遇到了一個問題,我在字典上使用 for 循環進行迭代以添加一個新值“百分比”,即“總數”除以所有股票的所有總數的總和。
def get_portfolio_value(stocks,item):
portValue = 0
percentage = 0
for k, v in stocks.items():
portValue = portValue + v.get(item,0)
stockData[ticker]['percentage'] = stockData[ticker]['total']/portValue
print(portValue)
get_portfolio_value(stockData,'total')
問題是 get_portfolio_value 函數讓我獲得了投資組合的整個 portValue 總數,但是我試圖將投資組合的百分比添加到每只股票的行不起作用 - 它只是奇怪地出現僅股票之一。 有人可以建議嗎?
這就是你想要的:
stock_data = {
'AAPL': {'beta': 1.01833975315094, 'company_name': 'Apple', 'dividend': 1.9341673320912078, 'total':300},
'GOOG': {'beta': 1.01833975315094, 'company_name': 'Apple', 'dividend': 1.9341673320912078, 'total':300}
}
stock_sum = sum(stock_data[item]['total'] for item in stock_data)
for item in stock_data:
stock_data[item]['percentage'] = int((float(stock_data[item]['total']) / stock_sum) * 100)
結果:
>>> for item in stock_data:
... print stock_data[item]['percentage']
...
50
50
如果我正確理解你的問題,你可以嘗試如下(我只是復制了下面的stockData
):
stockData = {
'AAPL': {
'beta': 1.01833975315094,
'company_name': 'Apple',
'dividend': 1.9341673320912078, 'total': 300},
'GOOG': {
'beta': 1.01833975315094,
'company_name': 'Apple',
'dividend': 1.9341673320912078, 'total': 300}}
我想這就是你的意思:
def get_portfolio_value(stocks, item='total'):
portValue = 0
for v in stocks.values():
portValue += v[item]
for k in stocks.keys():
stocks[k].update({'percentage': stocks[k]['total'] / portValue})
print(portValue)
get_portfolio_value(stockData, 'total')
您的問題可以分兩部分解決:
取總庫存的總和。 為此,您可以將sum()
用作:
stock_sum = sum(stock_data['total'] for stock_data in stockData.values())
迭代該值以更新條目。 由於您不需要key
,請使用dict.values()
僅迭代值:
for stock_data in stockData.values(): stock_data['percentage'] = stock_data['total']/stock_sum # ^ Adds new key into your existing `dict` object
現在,您的stockData
dict 的值以percentage
持有附加鍵
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