简化尝试，除了 yahooquery

Question

我正在尝试从 yahooquery 获取大约 10 个股票属性。当某些数据不可用时（例如，当公司没有盈利时，没有 PE 比率）它会引发 KeyError。在这种情况下，我想返回零。有什么办法可以简化我的代码而不是把 Try/Except 放到每个属性上？

def data(ticker): #pulling data about stock from Yahoo Finance API
    try:
        company_name = Ticker(ticker).quote_type[ticker]["shortName"]
    except KeyError:
        company_name = 0
    try:
        stock_price = Ticker(ticker).financial_data[ticker]["currentPrice"]
    except KeyError:
        stock_price = 0
    try:
        change = Ticker(ticker).history(interval='1mo', start=(datetime.datetime.today() - datetime.timedelta(days=90)), end=datetime.datetime.today())
        change = change["open"]
        growth_or_loose = ((change.iloc[-1] / change.iloc[0]) - 1)
    except:
        growth_or_loose = 0
    try:
        recommendation = Ticker(ticker).financial_data[ticker]["recommendationKey"]
    except KeyError:
        recommendation = 0
    try:
        market_cap = Ticker(ticker).summary_detail[ticker]["marketCap"]
    except KeyError:
        market_cap = 0
    try:
        pe = Ticker(ticker).summary_detail[ticker]["trailingPE"]
    except KeyError:
        pe = 0
    try:
        pb = Ticker(ticker).key_stats[ticker]["priceToBook"]
    except KeyError:
        pb = 0
    try:
        rev_growth = Ticker(ticker).financial_data[ticker]["revenueGrowth"]
    except KeyError:
        rev_growth = 0
    try:
        ern_growth = Ticker(ticker).financial_data[ticker]["earningsGrowth"]
    except KeyError:
        ern_growth = 0
    profit_margin = Ticker(ticker).financial_data[ticker]["profitMargins"]
    try:
        debt2equity = Ticker(ticker).financial_data[ticker]["debtToEquity"]
    except KeyError:
        debt2equity = 0
    data =  company_name, stock_price, growth_or_loose,  recommendation, market_cap, pe, pb, rev_growth, ern_growth, profit_margin, debt2equity
    return list(data)```

Answer 1

在这种情况下，您可以使用字典的 get 方法，如果字典不包含该键，则返回 None 而不是 KeyError，或者如果提供了默认值（第二个参数），它将返回默认值。

my_dict = {
    "hello" : "world"
}

try:
    hello = my_dict["NONEXISTING"]
except KeyError:
    hello = "greetings"

# the try/except block can be replaced with this, and since the key
# doesn't exist, the method returns "greetings" instead of raising a KeyError
hello = my_dict.get("NONEXISTING", "greetings")

Answer 2

您还可以使用集合中的 defaultdict 为任何没有值的变量提供默认值。 首先将您的字典转换为 defaultdict

# Python program to demonstrate 
# defaultdict 
  
  
from collections import defaultdict 
  
  
# Function to return a default 
# values for keys that is not 
# present 
def def_value(): 
    return "Not Present"
      
# Defining the dict 
d = defaultdict(def_value) 
d["a"] = 1
d["b"] = 2
  
print(d["a"]) 
print(d["b"]) 
print(d["c"]) 

输出：

1
2
Not Present

Answer 3

from yahooquery import Ticker
import time
symbols = {
    'AAPL': 'B12','BABA': 'B13','MSFT': 'B14',
}
tickers = Ticker(list(symbols.keys()), asynchronous=True)

try:
    while True:
        prices = tickers.price
        for k, v in symbols.items():
            try:
                a = str(prices[k]['regularMarketPrice'])
                print ("currentPrice : "+a)
            except Exception as e:print(0)
            try:
                b = str(prices[k]['marketCap'])
                print ("marketCap : "+b)
            except Exception as e:print(0)
            try:
                c = str(prices[k]['payoutRation'])
                print ("payoutRation : "+c)
            except Exception as e:print(0)
            except Exception as e:
                print(e)
    time.sleep(2)
except Exception as e:
        print(e)

您还可以使用以下方法将此数据导出到 Excel：

import xlwings as xw
wb = xw.Book('Filename.xlsx')
sht1 = wb.sheets['Sheet1']
for k, v in symbols.items():
    try:
        sht1.range(v).value = str(prices[k]['regularMarketPrice'])
        v1=v.replace("B", "C")
        sht1.range(v1).value = str(prices[k]['regularMarketDayHigh'])
        v2=v1.replace("C", "D")
        sht1.range(v2).value = str(prices[k]['regularMarketDayLow'])
    except Exception as e:
            print(e)