绘制分类数据的最佳方式

Question

我有一个这样的列表:

 gender = ['male','female','male','female']

使用matplotlib将这个列表的计数绘制成条形图的最简单方法是什么？

Answer 1

使用collections.Counter()您可以轻松计算列表中元素的频率.

然后,您可以使用以下代码创建条形图:

gender = ['male','male','female','male','female']

import matplotlib.pyplot as plt
from collections import Counter

c = Counter(gender)

men = c['male']
women = c['female']

bar_heights = (men, women)
x = (1, 2)

fig, ax = plt.subplots()
width = 0.4

ax.bar(x, bar_heights, width)

ax.set_xlim((0, 3))
ax.set_ylim((0, max(men, women)*1.1))

ax.set_xticks([i+width/2 for i in x])
ax.set_xticklabels(['male', 'female'])

plt.show()

结果图表: