How to put individual tags for a matplotlib scatter plot?

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Perhaps use plt.annotate:

import numpy as np
import matplotlib.pyplot as plt

N = 10
data = np.random.random((N, 4))
labels = ['point{0}'.format(i) for i in range(N)]

plt.subplots_adjust(bottom = 0.1)
plt.scatter(
    data[:, 0], data[:, 1], marker="o", c=data[:, 2], s=data[:, 3] * 1500,
    cmap=plt.get_cmap('Spectral'))

for label, x, y in zip(labels, data[:, 0], data[:, 1]):
    plt.annotate(
        label,
        xy=(x, y), xytext=(-20, 20),
        textcoords="offset points", ha="right", va="bottom",
        bbox=dict(boxstyle="round,pad=0.5", fc="yellow", alpha=0.5),
        arrowprops=dict(arrowstyle="->", connectionstyle="arc3,rad=0"))

plt.show()

enter image description here

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