Streamlit & yfinance

Using Streamlit
,
1

Hello,

I’m trying to get the datas from an etf with yfinance using this code :

import yfinance as yf
import pandas as pd
import streamlit as st

# Define start and end dates for fetching data
start_date = "2022-06-01"
end_date = pd.Timestamp.today().strftime("%Y-%m-%d")

# List of ISINs or ticker symbols
list_isin = ["JP3049040003"]

# Initialize lists to store data
prices_data = []
names_data = []

# Fetch data for each ISIN or ticker symbol
for isin in list_isin:
    try:
        # Fetch stock info and closing prices
        stock_info = yf.Ticker(isin).info
        name = stock_info['shortName']
        df = yf.download(isin, start=start_date, end=end_date, progress=False)["Close"]
        
        # Append data to lists
        names_data.append(name)
        prices_data.append(df)
    except Exception as e:
        st.write(f"Error fetching data for {isin}: {e}")

# Concatenate data into a DataFrame
if prices_data:
    df_stocks = pd.concat(prices_data, axis=1)
    df_stocks.columns = names_data

    # Plot cumulative returns
    cumulative_returns = (1 + df_stocks.pct_change(fill_method='ffill')).cumprod()
    st.line_chart(cumulative_returns)
else:
    st.write("No data available to plot.")

When I use the code on my computer everything is good but when i do it on my shared app online i got this error message :

“Failed to parse json response from Yahoo Finance: {‘code’: ‘Not Found’, ‘description’: ‘HTTP 404 Not Found’}”

I asked Chatgpt about it and the answer was :
Streamlit applications might have restrictions on external API access compared to your local environment. Some APIs might block requests coming from shared hosting environments to prevent misuse.

I found out later that it works if enter the ticker (2563.T) but not if I enter the ISIN (JP3049040003) so I can’t understand why this answer could be right.

If someone can find an explanation, I would be grateful!

2

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