问Python matplotlib如何更改“直方图”的y值

EN

import numpy as np

x = np.array([1, 2.2, 1.4, 2, 3.3, 2.6, 3, 1.5, 3.9])
# sort x and y
ind = np.argsort(x)
x1 = x[ind]
y = np.array([1, 2, 2.5, 1, 0.5, 3, 4, 3, 2])
y1 = y[ind]

# count bins
y2, t = np.histogram(x1, bins=3)
ind1 = y2.cumsum()
ind2 = np.array([0]+[e for e in ind1[0:-1]])

# sum based on counts
y_final = [y1[i:j].sum() for (i, j) in zip(ind2, ind1)]

# plot bar, specify the width
fig, ax = plt.subplots(1, 1, figsize=(7.2, 7.2))
ax.bar(t[0:3], y_final, width=np.diff(t)[0])

import matplotlib.pyplot as plt

x = [1, 2.2, 1.4, 2, 3.3, 2.6, 3, 1.5, 3.9]
y = [1, 2, 2.5, 1, 0.5, 3, 4, 3, 2]
plt.hist(x, weights=y, bins=3)