假设你有一个 Dataframe df，它应该用两种不同的线条样式来绘制。每一条带有“X_Y”==“Y”的线都应该是虚线。我想知道是否有比下面更快更有效的方法？

import pandas as pd
import matplotlib.pyplot as plt

df = pd.DataFrame(
    {
        "Point": (
            "1", "1", "2", "2", "3", "3", "4", "4", "5", "5"
        ),
        "X_Y": (
            "X", "Y", "X", "Y", "X", "Y", "X", "Y", "X", "Y",
        ),
        0: (
            70, 67, 66.7, 68.8, 66.2, 69.5, 68.5, 67.7, 68.8, 67.72,
        ),
        1: (
            69, 68.2, 66.5, 68.1, 66.7, 70, 68.1, 66.7, 66.08, 65.72,
        ),
        2: (
            71, 68, 67.75, 67.8, 67.72, 70.3, 67.6, 66.5, 69.08, 66.72,
        ),
        3: (
            70.5, 67.3, 67.5, 64.8, 68.3, 69.3, 68.6, 68.5, 70.08, 67.72,
        ),
    }
)

print(df)

vals = ["X", "Y"]
styles = ["-", "--"]

plt.figure()
plt.grid(True)
for val, style in zip(vals, styles):
    dff = df.loc[df["X_Y"] == val].drop(["Point", "X_Y"], axis=1).T

    plt.plot(dff, linestyle=style)
    
plt.show()