Error when creating graph with mplfinance

Question

I am unsure why my code isn't working. I have used the same code for months now and am getting an odd error all of a sudden. Not really sure how to troubleshoot what's going wrong. The excel sheet I'm reading is basically a list of ticker names going down the first column like:

VNDA
VNDA
CKPT
SNSE
CNST

My Code:

import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot as plt
import xlsxwriter as xl
import numpy as np
import yfinance as yf
import pandas as pd 
import mplfinance as mpf 
import pandas_datareader 
from pandas_datareader import data as pdr
yf.pdr_override()
import numpy as np

Individualreport = "C:\\Users\\Ashley\\FromPython.xlsx"

READ = "C:\\Users\\Ashley\\Biotech Data Center 8.1.xlsx"

Ticklist = pd.read_excel(READ,sheet_name='Tickers', header=None)
stocks = Ticklist.values.ravel()

short_sma = 20
mid_sma = 50
long_sma = 100

writer = pd.ExcelWriter(Individualreport, engine='xlsxwriter')

for i in stocks:
    plotdata = pdr.get_data_yahoo(i, start='2020-08-01', end='2021-07-31')
    df = pd.DataFrame(plotdata)

    graph = mpf.plot(df, type = 'candlestick',figratio=(16.7,6),  
         mav=(short_sma,mid_sma,long_sma),
         volume=True, title= str(i), 
         style='default', savefig=dict(fname=''+str(i)+'.png', bbox_inches= "tight"))
    
writer.save()    

Error Code:

PS C:\users\ashley\appdata\roaming\python\python38\site-packages> & C:/Users/Ashley/AppData/Local/Programs/Python/Python39/python.exe "c:/Users/Ashley/OneDrive/Documents/just graphs part 2.py"
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\threading.py", line 954, in _bootstrap_inner
    self.run()
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\site-packages\multitasking\__init__.py", line 102, in _run_via_pool
    return callee(*args, **kwargs)
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\site-packages\yfinance\multi.py", line 167, in _download_one_threaded
    data = _download_one(ticker, start, end, auto_adjust, back_adjust,
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\site-packages\yfinance\multi.py", line 179, in _download_one
    return Ticker(ticker).history(period=period, interval=interval,
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\site-packages\yfinance\base.py", line 157, in history
    data = data.json()
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\site-packages\requests\models.py", line 900, in json
    return complexjson.loads(self.text, **kwargs)
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\json\__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\Ashley\AppData\Local\Programs\Python\Python39\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Answer 1

This should fix your problem

pip uninstall yfinance
pip uninstall pandas-datareader
pip install yfinance --upgrade --no-cache-dir
pip install pandas-datareader

Note, the --no-cache-dir option is important.