TypeError: can only concatenate str (not "NoneType") to str

[pzarfos]

Here is a short Python script that demonstrates the issue:

from yahoofinancials import YahooFinancials

ticker = "AAPL"
data = YahooFinancials(ticker)

ticker = data.ticker
price = data.get_current_price()

print(f"Ticker: {ticker}")
print(f"Price:  {price}")

When running that script, I got the following error, using yahoofinancials 1.17:

Traceback (most recent call last):
  File "./example.py", line 8, in <module>
    price = data.get_current_price()
  File "./env/lib/python3.9/site-packages/yahoofinancials/yf.py", line 226, in get_current_price
    return self._stock_price_data('regularMarketPrice')
  File "./env/lib/python3.9/site-packages/yahoofinancials/yf.py", line 162, in _stock_price_data
    price_data = self.get_stock_price_data()
  File "./env/lib/python3.9/site-packages/yahoofinancials/yf.py", line 99, in get_stock_price_data
    return self.get_clean_data(self.get_stock_tech_data('price'), 'price')
  File "./env/lib/python3.9/site-packages/yahoofinancials/etl.py", line 595, in get_stock_tech_data
    return self.get_stock_data(tech_type=tech_type)
  File "./env/lib/python3.9/site-packages/yahoofinancials/etl.py", line 565, in get_stock_data
    dict_ent = self._create_dict_ent(self.ticker, statement_type, tech_type, report_name, hist_obj)
  File "./env/lib/python3.9/site-packages/yahoofinancials/etl.py", line 521, in _create_dict_ent
    re_data = self._get_historical_data(YAHOO_URL, r_map, tech_type, statement_type)
  File "./env/lib/python3.9/site-packages/yahoofinancials/etl.py", line 248, in _get_historical_data
    self._request_handler(url, config.get("response_field"))
  File "./env/lib/python3.9/site-packages/yahoofinancials/etl.py", line 190, in _request_handler
    cur_url += "&crumb=" + self.crumb
TypeError: can only concatenate str (not "NoneType") to str

The installed PIP packages are:

# pip freeze
beautifulsoup4==4.11.1
black==23.10.1
certifi==2022.12.7
cffi==1.15.1
charset-normalizer==3.0.1
click==8.1.7
cryptography==39.0.0
cycler==0.11.0
fonttools==4.33.3
idna==3.4
kiwisolver==1.4.2
matplotlib==3.5.2
mypy-extensions==1.0.0
numpy==1.22.3
packaging==23.2
pandas==1.4.2
pathspec==0.11.2
Pillow==9.1.0
platformdirs==3.11.0
pycparser==2.21
pycryptodome==3.18.0
pyparsing==3.0.9
python-dateutil==2.8.2
pytz==2022.1
requests==2.28.2
six==1.16.0
soupsieve==2.3.2.post1
tabulate==0.9.0
termcolor==1.1.0
tomli==2.0.1
typing-extensions==4.8.0
urllib3==1.26.14
yahoofinancials==1.17

I am running Python 3.9.2 in a virtual env on Linux.

It is possible this is related to issue https://github.com/JECSand/yahoofinancials/issues/157

[JECSand]

I’ll take a look at this tonight.

[pzarfos]

OK, this is embarrassing, my ad blocker was causing the problem.

I am using pi-hole for my ad blocker. I swear it was working last month though. They must have recently added yahoo domain names to their ad-block database.

The solution is to make sure you have the yahoo finance domain names whitelisted in your ad-blocker:

fc.yahoo.com
finance.yahoo.com
query2.finance.yahoo.com