绘制带彩色标记的散点图

import matplotlib.pyplot as plt
import numpy as np

x = np.random.rand(1000)

# 不相关数据
y1 = np.random.rand(len(x))
# 强正相关数据
y2 = 1.2 + np.exp(x)

ax1 = plt.subplot(121)
# alpha：透明度
# marker：设置点状标记
plt.scatter(x, y1, color='indigo', alpha=0.3, edgecolors='white',
            label='no correl', marker='s')
plt.xlabel('no correlation')
plt.grid(True)
plt.legend()

# 共x、y轴刻度
ax2 = plt.subplot(122, sharey=ax1, sharex=ax1)
plt.scatter(x, y2, color='green', alpha=0.3, edgecolors='grey', label='correl')
plt.xlabel('strong correlation')
plt.grid(True)
plt.legend()

plt.show()