Attribute Error about finrl HOT 2 OPEN

instead of append you can use
`df_trade_date = pd.DataFrame({'datadate': unique_trade_date})
df_account_value = pd.DataFrame()

for i in range(rebalance_window + validation_window, len(unique_trade_date) + 1, rebalance_window):
temp = pd.read_csv('results/account_value_trade_{}_{}.csv'.format('ensemble', i))
df_account_value = pd.concat([df_account_value, temp], ignore_index=True)

sharpe = (252**0.5) * df_account_value['account_value'].pct_change(1).mean() / df_account_value['account_value'].pct_change(1).std()
print('Sharpe Ratio: ', sharpe)

df_account_value = pd.concat([df_account_value, df_trade_date[validation_window:].reset_index(drop=True)], axis=1)`

use concat

from finrl.

helpful!

from finrl.