相关系数矩阵 热力图Python作图

import matplotlib.pyplot as plt
import pandas as pd
import seaborn as sns

plt.rcParams['font.sans-serif'] = ['SimHei']  # 用来正常显示中文标签
plt.rcParams['axes.unicode_minus'] = False  # 用来正常显示负号
# Import Dataset
df = pd.read_csv("成绩单.csv",encoding='ANSI')

# Plot6
a=df.corr()
plt.subplots(figsize=(9, 9))
sns.heatmap(a, annot=True, vmax=1, square=True, cmap="Blues")
plt.show()