How can I plot different numbers of Y values for each X value

只需分别绘制每个组：

for xe, ye in zip(x, y):

plt.scatter([xe] * len(ye), ye)

and how can I change the X axis from being the numbers 1 and 2 to text categories “cat1” and “cat2”.

手动设置滴答和刻度标签：

plt.xticks([1, 2])

plt.axes().set_xticklabels(['cat1', 'cat2'])

完整代码：

import matplotlib.pyplot as plt

import numpy as np

y = [(1,1,2,3,9),(1,1,2,4)]

x = [1,2]

for xe, ye in zip(x, y):

plt.scatter([xe] * len(ye), ye)

plt.xticks([1, 2])

plt.axes().set_xticklabels(['cat1', 'cat2'])

plt.savefig('t.png')