对数据进行排序以在python中将条形图从最高到最低呈现

Question

我有很多数字出现,并想在条形图中绘制它们(如直方图).

我有图表工作,但它按照我输入的值的顺序,而不是从最高到最低的顺序,这就是我想要的.

这是迄今为止的代码:

 phenos = [128, 20, 0, 144, 4, 16, 160, 136, 192, 52, 128, 20, 0, 4, 16, 144, 130, 136, 132, 22, 
128, 160, 4, 0, 32, 36, 132, 136, 164, 130, 128, 22, 4, 0, 144, 160, 54, 130, 178, 132, 
128, 4, 0, 136, 132, 68, 196, 130, 192, 8, 128, 4, 0, 20, 22, 132, 144, 192, 130, 2, 
128, 4, 0, 132, 20, 136, 144, 192, 64, 130, 128, 4, 0, 144, 132, 28, 192, 20, 16, 136, 
128, 6, 4, 134, 0, 130, 160, 132, 192, 2,  128, 4, 0, 132, 68, 160, 192, 36, 64, 
128, 4, 0, 136, 192, 8, 160, 12, 36, 128, 4, 0, 22, 20, 144, 86, 132, 82, 160,
128, 4, 0, 132, 20, 192, 144, 160, 68, 64, 128, 4, 0, 132, 160, 144, 136, 192, 68, 20]

from collections import Counter
import numpy as np
import matplotlib.pyplot as plt


labels, values = zip(*Counter(phenos).items())

indexes = np.arange(len(labels))
width = 1

plt.bar(indexes, values, width)
plt.xticks(indexes + width * 0.5, labels)
plt.show()

它产生了以下图片.对不起,标签都是笑的.

我希望它从最高到最低......有谁知道如何在不改变我的现象的情况下做到这一点？我试过了

phenos.sort()

在我绘制图形之前但没有改变图形.提前致谢!

Answer 1

先排序Counter(phenos).items():

In [40]: from collections import Counter
    ...: import numpy as np
    ...: import matplotlib.pyplot as plt
    ...: from operator import itemgetter
    ...: 
    ...: c = Counter(phenos).items()
    ...: c.sort(key=itemgetter(1))
    ...: labels, values = zip(*c)
    ...: 
    ...: indexes = np.arange(len(labels))
    ...: width = 1
    ...: 
    ...: plt.bar(indexes, values, width)
    ...: plt.xticks(indexes + width * 0.5, labels)
    ...: plt.show()

输出继电器:

或者,如果您想按x轴排序,只需使用itemgetter(0):

c.sort(key=itemgetter(0))

获得: