特征标准化

def solve():
    import pandas as pd
    from sklearn.preprocessing import StandardScaler
    from sklearn.model_selection import train_test_split
    df = pd.read_csv(____)
    X = df.drop(____); y = df["____"]
    X_train, X_test, y_train, y_test = train_test_split(____)
    scaler = StandardScaler()
    X_train_scaled = scaler.fit_transform(____)
    col0 = X_train_scaled[:, ____]
    print(____)