matplotlib绘制数据间隔不一致的直方图

#在美国2004年人口普查发现有124 million的人在离家相对较远的地方工作。根据他们从家到上班地点所需要的时间,通过抽样统计获得以下数据,将这些数据绘制成直方图
#interval =[0,5,10,15,20,25,30,35,40,45,60,90]
#width = [5,5,5,5,5,5,5,5,5,15,30,60]
#quantity = [836,2737,3723,3926,3596,1438,3273,642,824,613,215,47]

import matplotlib.pyplot as plt 
from matplotlib.font_manager import FontProperties

font = {'family':'SimHei',
        'weight':'bold',
        'size':'12'}
plt.rc('font', **font)
plt.rc('axes', unicode_minus=False)

x =[0,5,10,15,20,25,30,35,40,45,60,90]
width = [5,5,5,5,5,5,5,5,5,15,30,60]
y = [836,2737,3723,3926,3596,1438,3273,642,824,613,215,47]


x1 = x[:-2]
x2 = [x[-2]]
x3 = [x[-1]]
b1 = list(range(50,60,5))
b2 = list(range(65,90,5))
b3 = list(range(95,150,5))
_x = x1 + b1 + x2+ b2 + x3 +b3


y1 = y[:-2]
y2 = [y[-2]]
y3 = [y[-1]]
a1 = [613] * len(range(50,60,5))
a2 = [215] * len(range(65,90,5))
a3 = [47]  * len(range(95,150,5))
_y = y1 +a1+y2+a2+y3+a3

z = [str(i) for i in x]#将列表中的数值转换为字符串
z1 = z[:-2]
z2 = [z[-2]]
z3 = [z[-1]]
c1 = [''] * len(range(50,60,5))
c2 = [''] * len(range(65,90,5))
c3 = [''] * len(range(95,150,5))

_x_labels1 = z1 + c1+ z2 + c2+ z3+ c3

plt.figure(figsize=(20,8),dpi = 80)
plt.bar(range(len(_x)),_y,width = 1)

#调整x轴刻度
_x1 = [i - 0.5 for i in range(len(_x)+1)]
_x_labels1.append(150)

print(_x1) 
print(_x_labels1)
print(len(_x1),len(_x_labels1))

plt.xticks(_x1,_x_labels1)
plt.grid(alpha = 0.4)
plt.xlabel("从家到上班地点所需要的时间") 
plt.ylabel('人数')
plt.title('2004年124 million人从家到上班地点所需要的时间人数分布直方图')
plt.savefig('2004年124 million人从家到上班地点所需要的时间人数分布直方图.png')
plt.show()