GBDT的StratifiedKFold 5折交叉验证

def solve():
    from pyodide.http import open_url
    from io import StringIO
    loans_featured_csv = open_url(____).read()
    import pandas as pd
    from sklearn.ensemble import GradientBoostingClassifier
    from sklearn.model_selection import StratifiedKFold,cross_val_score
    from io import StringIO
    df = pd.read_csv(StringIO(____))
    num_cols=[c for c in df.select_dtypes(____).columns if c not in ['____','____'] and not c.endswith(____)]
    X=df[num_cols].fillna(____); y=df['____']
    gb=GradientBoostingClassifier(____)
    cv=StratifiedKFold(____)
    scores=cross_val_score(____)
    for i,s in enumerate(____): print(____)
    print(____)