以下方法将根据您的数据框创建颜色列表,然后使用每种颜色的标签绘制一个点：

import matplotlib.pyplot as plt

import matplotlib.cm as cm

import matplotlib.colors as colors

import numpy as np

import pandas as pd

fig, ax = plt.subplots()

df = pd.DataFrame({'n1':[1,2,1,3], 'n2':[1,3,2,1], 'l':['a','b','c','d']})

colormap = cm.viridis

colorlist = [colors.rgb2hex(colormap(i)) for i in np.linspace(0, 0.9, len(df['l']))]

for i,c in enumerate(colorlist):

x = df['n1'][i]

y = df['n2'][i]

l = df['l'][i]

ax.scatter(x, y, label=l, s=50, linewidth=0.1, c=c)

ax.legend()

plt.show()