加载日学习统计并分析趋势

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    stats=pd.read_csv(StringIO(open_url("https://data.zuihe.com/dbd/ms-memcard/state_03/learning_stats.csv").read()))
    print(f"Total records: {len(stats)}")
    print(f"Avg daily reviewed: {round(stats['cards_reviewed'].mean(),1)}")
    print(f"Avg retention: {round(stats['retention_rate'].mean(),1)}%")
    print(f"Avg study time: {round(stats['study_time_min'].mean(),1)} min")
    active=stats[stats['cards_reviewed']>0]
    print(f"Active days: {len(active)}/{len(stats)} ({round(len(active)/len(stats)*100,1)}%)")