Question

我遇到无法修复的错误，将在下面显示。而且，经过优化的代码足以被视为专业的编码器吗？

我正在尝试编写一个可以在整个项目中回顾的类。

您是否有关于如何对第一个__init__()块进行编码的参考，而没有提及数据源，但稍后会引用它吗？
如何调用简单功能get_sd()？似乎缺少end参数，但它在那里。

这是我的代码：

 import pandas as pd
 import requests
 from bs4 import BeautifulSoup
 import datetime as dt
 import matplotlib.pyplot as plt
 from pandas_datareader import data as pdr
 import fix_yahoo_finance as yf
 import numpy as np
 import math

 yf.pdr_override()

 class Ret:
    def __init__(self, ticker, start, end):
       data = yf.download(ticker, start, end, actions=True)
       self.returns = data["Return"] = (data["Close"] - data["Close"].shift(1)) / data["Close"].shift(1)
       self.CumRet = data["CumRet"] = data["Return"].cumsum()
       self.RetDiv = data["RetDiv"] = (returns + data["Dividends"] / data["Close"])
       self.CumRetDiv = data["CumRetDiv"] = data["RetDiv"].cumsum()

    def get_sd(self, ticker, start, end):
       return self.returns

    stocks = ["MMM",]
    start = "2006-01-01"
    # input("Enter start year") +
    end = dt.date.today()

    Ret.get_sd("AAPL", start, end)
    print(aapl)

这是我得到的错误：

Traceback (most recent call last):
  File "C:/Users/ruleb/Desktop/python test/Ptf_Project/Get_data_prices.py", line 51, in <module>
  Ret.get_sd("AAPL", start, end)
  TypeError: get_sd() missing 1 required positional argument: 'end'

  Process finished with exit code 1

编辑，我试图进行如下修改：

stocks = ["MMM"]
start = "2008-01-01"
end = dt.date.today()


class Ret:
    def __init__(self, ticker, start, end):
    return

    def get_sd(self):
    return np.std(self.Returns)

    def get_data(self):
    data = yf.download(ticker, start, end, actions=True)
    self.Returns = data["Return"] = (data["Close"] - data["Close"].shift(1)) / data["Close"].shift(1)
    self.CumRet = data["CumRet"] = data["Return"].cumsum()
    self.RetDiv = data["RetDiv"] = (data["Return"] + data["Dividends"] / data["Close"])
    self.CumRetDiv = data["CumRetDiv"] = data["RetDiv"].cumsum()
    return data

 myRet = Ret(stocks,start,end)
 myData = myRet.get_data
 print(myData)

但是我明白了：

<bound method Ret.get_data of <__main__.Ret object at 0x031ED310>>

Answer 1

在问题的编辑版本中查看代码，您需要调用方法：将myRet.get_data更改为myRet.get_data()。

class Ret:
    def __init__(self):
        # it is a good practice to initialize the attributes
        # in '__init__()', even if you are going to use them later
        self.Returns = None
        self.CumRet = None
        self.RetDiv = None
        self.CumRetDiv = None

    def get_sd(self):
        return np.std(self.Returns)

    def get_data(self):
        data = yf.download(ticker, start, end, actions=True)

        self.Returns = data["Return"] = (data["Close"] - data["Close"].shift(1)) / data["Close"].shift(1)
        self.CumRet = data["CumRet"] = data["Return"].cumsum()
        self.RetDiv = data["RetDiv"] = (data["Return"] + data["Dividends"] / data["Close"])
        self.CumRetDiv = data["CumRetDiv"] = data["RetDiv"].cumsum()

        return data

myRet = Ret(stocks, start, end)
myData = myRet.get_data()
print(myData)

Python-如何调用正确的函数

1 个答案: