import pandas as pd
import time

# Suppose data is an empty dataframe
df = pd.DataFrame()

# The original problem says:
# "Missing optimization on DataFrame creation from iteration"
# Where is there iteration? Wait, there is an iteration on columns in `_clean_dataframe`!
# "df.columns = [str(c).lower() for c in df.columns]"

# Wait! Is it `_clean_dataframe`?
# The issue points to `tradingagents/dataflows/stockstats_utils.py:52`
# But let's look at the actual code at line 52.