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fetch_data.py
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fetch_data.py
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import sys
import yfinance as yf
from datetime import datetime, timedelta
def fetch_data(ticker, start_date=None, end_date=None):
if start_date and end_date:
# Parse dates
try:
start = datetime.strptime(start_date, '%Y-%m-%d')
end = datetime.strptime(end_date, '%Y-%m-%d')
except ValueError:
print(f"Error: Invalid date format. Use YYYY-MM-DD.")
sys.exit(1)
# Ensure start date is before end date
if start >= end:
print(f"Error: Start date {start_date} must be before end date {end_date}.")
sys.exit(1)
# Adjust end date to include the end date (yfinance end date is exclusive)
adjusted_end = end + timedelta(days=1)
adjusted_end_str = adjusted_end.strftime('%Y-%m-%d')
data = yf.download(ticker, start=start_date, end=adjusted_end_str, interval='1d')
else:
data = yf.download(ticker, period='max', interval='1d')
if data.empty:
print(f"Error: No data fetched for {ticker} from {start_date} to {end_date}.")
sys.exit(1)
else:
data.to_csv('stock_data.csv')
print("Data fetched successfully.")
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Usage: python fetch_data.py <ticker> [<start_date> <end_date>]")
sys.exit(1)
ticker = sys.argv[1]
if len(sys.argv) == 4:
start_date = sys.argv[2]
end_date = sys.argv[3]
fetch_data(ticker, start_date, end_date)
else:
fetch_data(ticker)