matplotlib：中心x刻度标签

Question

此代码

import numpy as np
vals = []
for i in range(500):
  vals.append(random.randint(-6,6))
edges = np.arange(-6,7,1)
fig, ax = subplots(figsize=(8,5))
ax.hist(vals, bins=edges, rwidth=0.90)
ax.set_xticks(edges)
my_xlabels = [ str(i) for i in edges[:-1] ]
ax.set_xticklabels(my_xlabels)

生成此直方图：

但我需要x轴标签位于条形图的中间，如下所示：

我试图关注https://matplotlib.org/gallery/ticks_and_spines/centered_ticklabels.html#sphx-glr-gallery-ticks-and-spines-centered-ticklabels-py但是这个例子因日期，定位器和格式化程序而变得复杂，我无法弄清楚，也不想要。

寻找简单，理想的1线解决方案。我试过这些，但都没有用：

ax.set_xticklabels(my_xlabels, horizontalalignment='center')

ax.set_xticklabels(my_xlabels, fontdict={'horizontalalignment':'center'})

ax.xaxis.set_ticklabels(my_xlabels, horizontalalignment='center')

xticks(my_xlabels, horizontalalignment='center') #ERROR

for tick in ax.xaxis.get_majorticklabels():
    tick.set_horizontalalignment("center")


ax.get_xaxis().majorTicks[1].label1.set_horizontalalignment('center')
ax.get_xaxis().majorTicks[2].label1.set_horizontalalignment('center')