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import requests
import json
"""
Given the parameters,
fetches the data for the corresponding chart using yahoo finance.
Expect it to raise an error on bad params!
"""
def fetch_chart_data(ticker, period='1y', interval='1d'):
params = {
'interval' : interval, # 1m, 2m, 5m, 15m, 30m, 60m, 90m, 1h, 4h, 1d, 5d, 1wk, 1mo, 3mo
'range' : period, # "1d","5d","1mo","3mo","6mo","1y","2y","5y","10y","ytd","max"
'events' : 'div|split|earn',
'includePrePost' : 'false' }
headers = {'User-agent' : 'fin-backtesting-proj'}
r = requests.get("https://query2.finance.yahoo.com/v8/finance/chart/" + ticker, headers=headers, params=params)
print(r.url)
print("status_code:\t", r.status_code)
# decode the JSON response data into a Python object
r.raise_for_status() # raises if error before parsing
data_obj = r.json()
# get the specific data we want
timestamps = data_obj['chart']['result'][0]['timestamp']
close_prices = data_obj['chart']['result'][0]['indicators']['quote'][0]['close']
print('close_price len: ', len(close_prices), 'timestamps len: ', len(timestamps))
# clean out null's and 0s from the data
for i in range(len(timestamps)):
if close_prices[i] == None or close_prices[i] == 0:
del close_prices[i]
del timestamps[i]
i -= 1
name = data_obj['chart']['result'][0]['meta']['longName']
return {'timestamps': timestamps, 'prices': close_prices, 'name': name}
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