mpl_finance 无法将 -100000 转换为日期

Question

我正在尝试使用 mpl_finance 制作一个简单的烛台 ohlc 图表。在他们的网站上，它说 candlestick_ohlc 方法的引号参数中的第一个元素是日期。它说它们必须以浮动日期格式进行格式化。然而，当我使用 date2num 时，它给我一个错误，说 "Cannot convert -100000 to a date. This often happens if non-datetime values are passed to an axis that expects datetime objects." 当我使用没有 date2num 方法的原始列表时，它给我一个错误，指向一行代码 - xy=(t-OFFFSET, lower ) 和一个消息 -“- 的操作数类型不受支持：'datetime.date' 和 'float'。它似乎希望我使用浮点数而不是 datetime.date，但这与之前的错误相矛盾。这是我的代码。任何帮助将不胜感激。提前致谢。

import requests
import json
import pprint
import matplotlib.pyplot as plt
from mpl_finance import candlestick_ohlc
import matplotlib.dates as mdates
from datetime import datetime, date, time

url = "https://www.alphavantage.co/query"

function = "TIME_SERIES_DAILY"
symbol = "MSFT"
api_key = "K2H0JNUZBWYKW02L"

data = { "function": function, 
     "symbol": symbol, 
     "apikey": api_key } 
page = requests.get(url, params = data)
thedata = page.json()
days = []
dailyopen = []
dailyclose = []
dailyhigh = []
dailylow = []
dailyvol = []
delimitedyear = []
delimitedday = []
delimitedmonth = []

thedatakeys = list(thedata['Time Series (Daily)'].keys())
thedatakeys.sort()

for day in thedatakeys:
    days.append(day)
    dailyopen.append(float(thedata['Time Series (Daily)'][day] 
   ['1. open']))
    dailyhigh.append(float(thedata['Time Series (Daily)'][day] 
   ['2. high']))
    dailylow.append(float(thedata['Time Series (Daily)'][day] 
   ['3. low']))
    dailyclose.append(float(thedata['Time Series (Daily)'] 
   [day]['4. close']))
    dailyvol.append(float(thedata['Time Series (Daily)'][day] 
   ['5. volume']))

counter = 0
for day in days:
    delimitedyear.append(days[counter][0:4])
    delimitedmonth.append(days[counter][5:7])
    delimitedday.append(days[counter][8:10])
    counter = counter + 1
d = []

for newcounter in range(len(delimitedyear)):
    d.append(date(int(delimitedyear[newcounter]), 
int(delimitedmonth[newcounter]), 
int(delimitedday[newcounter])))

formatteddates = mdates.date2num(d)
ohlc = [formatteddates, dailyopen, dailyhigh, dailylow, 
dailyclose]
print(formatteddates)

fl, ax = plt.subplots(figsize = (10,5))
candlestick_ohlc(ax, ohlc, width=.6, colorup='green', 
colordown='red')
ax.xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m'))

ax.grid(False)

plt.show()

Answer 1

candlestick_ohlc 的输入格式需要是 (datetime, open, high, ...) 元组的列表，或相应的 numpy 数组。
在这里，您提供的是 [[datetime1, datetime2, ...], [open1, open2, ...], ...] 的列表。

要转换为所需的格式，您可以例如使用

ohlc = list(zip(formatteddates, dailyopen, dailyhigh, dailylow, dailyclose))

mpl_finance 无法将 -100000 转换为日期

mpl_finance cannot convert -100000 to a date

python

matplotlib

candlestick-chart