ValueRaider
macOS: Unable to run yfinance-cache: python multiprocessing errors
I'm not able to run yfinance-cache. I get the following python multiprocessing errors:
I tried with Python 3.12 and 3.9, macOS Ventura
What Python version do you recommend?
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 125, in _main
prepare(preparation_data)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 236, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 287, in _fixup_main_from_path
main_content = runpy.run_path(main_path,
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/runpy.py", line 288, in run_path
return _run_module_code(code, init_globals, run_name,
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/runpy.py", line 97, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/path/to/venv/script.py", line 376, in <module>
best_performing_asset(snp500)
File "/path/to/venv/script.py", line 250, in best_performing_asset
stock_data = get_asset_data(asset_list)
File "/path/to/venv/script.py", line 219, in get_asset_data
stock_data = yf.download(asset_list_joined, start=start, end=end, interval="1mo")["Close"] # Download closing monthly.
File "/path/to/venv/lib/python3.9/site-packages/yfinance_cache/yfc_multi.py", line 48, in download
queue = multiprocessing.Manager().Queue()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 57, in Manager
m.start()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/managers.py", line 554, in start
self._process.start()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 32, in __init__
super().__init__(process_obj)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_fork.py", line 19, in __init__
self._launch(process_obj)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 42, in _launch
prep_data = spawn.get_preparation_data(process_obj._name)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
RuntimeError:
An attempt has been made to start a new process before the
current process has finished its bootstrapping phase.
This probably means that you are not using fork to start your
child processes and you have forgotten to use the proper idiom
in the main module:
if __name__ == '__main__':
freeze_support()
...
The "freeze_support()" line can be omitted if the program
is not going to be frozen to produce an executable.
Traceback (most recent call last):
File "/path/to/venv/script.py", line 5, in <module>
import yfinance_cache as yf
File "/path/to/venv/lib/python3.9/site-packages/yfinance_cache/__init__.py", line 3, in <module>
from .yfc_dat import Period, Interval, AmbiguousComparisonException
File "/path/to/venv/lib/python3.9/site-packages/yfinance_cache/yfc_dat.py", line 266, in <module>
manager = Manager()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 57, in Manager
m.start()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/managers.py", line 558, in start
self._address = reader.recv()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/connection.py", line 250, in recv
buf = self._recv_bytes()
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/connection.py", line 414, in _recv_bytes
buf = self._recv(4)
File "/usr/local/Cellar/[email protected]/3.9.19/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/connection.py", line 383, in _recv
raise EOFError
EOFError
What version YFC? Latest release has big changes to download, so I'm curious if upgrading to latest, or downgrading to previous, helps.
@ValueRaider thanks I tried to downgrade as suggested, but I still get the same error.
I tried with yfinance 0.2.40 (latest), 0.2.38, 0.2.36 (found in yfinance-cache dependencies), but no luck.
Perhaps you could share your configuration and module versions with pip list?
$ python --version
Python 3.9.19
$ pip list
Package Version
--------------------- -----------
appdirs 1.4.4
beautifulsoup4 4.12.3
certifi 2024.7.4
charset-normalizer 3.3.2
click 8.1.7
exchange_calendars 4.5.5
frozendict 2.4.4
html5lib 1.1
idna 3.7
korean-lunar-calendar 0.3.1
lxml 5.2.2
multitasking 0.0.11
numpy 1.26.4
pandas 2.0.3
peewee 3.17.5
pip 24.0
platformdirs 4.2.2
pyluach 2.2.0
python-dateutil 2.9.0.post0
pytz 2024.1
requests 2.32.3
scipy 1.13.1
setuptools 69.2.0
six 1.16.0
soupsieve 2.5
toolz 0.12.1
tzdata 2024.1
urllib3 2.2.2
webencodings 0.5.1
yfinance 0.2.36
yfinance-cache 0.6.4
Python 3.12. It's more likely to be how multiprocessing works on Macs than package versions - I dev on Linux. You aren't first to encounter issues on Mac
I tried with Python 3.12, but the issue is the same. Sounds like it is specific to Mac. I will run my program in a Docker for now.
FYI
$ python --version
Python 3.12.3
$ pip list
Package Version
--------------------- -----------
appdirs 1.4.4
beautifulsoup4 4.12.3
certifi 2024.7.4
charset-normalizer 3.3.2
click 8.1.7
exchange_calendars 4.5.5
frozendict 2.4.4
html5lib 1.1
idna 3.7
korean-lunar-calendar 0.3.1
lxml 5.2.2
multitasking 0.0.11
numpy 1.26.4
pandas 2.0.3
peewee 3.17.5
pip 24.0
platformdirs 4.2.2
pyluach 2.2.0
python-dateutil 2.9.0.post0
pytz 2024.1
requests 2.32.3
scipy 1.14.0
six 1.16.0
soupsieve 2.5
toolz 0.12.1
tzdata 2024.1
urllib3 2.2.2
webencodings 0.5.1
yfinance 0.2.40
yfinance-cache 0.6.4
I don't have access to Windows nor Mac. Most changes in #46 were from ChatGPT/Claude, so try getting them to fix. There isn't much parallel code to feed the AI:
- process launch https://github.com/ValueRaider/yfinance-cache/blob/8ce6b3f098c0d8bdd7700bd85997cc175ae9f005/yfinance_cache/yfc_multi.py#L47-L83
- safety locks https://github.com/ValueRaider/yfinance-cache/blob/8ce6b3f098c0d8bdd7700bd85997cc175ae9f005/yfinance_cache/yfc_dat.py#L263-L269
I landed on this thread from a google search about yfinance-cache and python multiprocessing errors on my mac using python 3.12.9.
So I decided to run the same code in a docker container, and it worked fine. It seemed like a possible mac vs linux issue.
When stepping through with the python debugger though, it was looking for some metadata in ~/Library/Caches/py-yfinance-cache. I removed that folder and it started working without error (and the cache folder was recreated).
Anyway, might be worth trying, @sonique6784 and @louiskenyon98.
