数据可视化图表-计数图 （Counts Plot）

 避免点重叠问题的另一个选择是增加点的大小，这取决于该点中有多少点。 因此，点的大小越大，其周围的点的集中度越高。

import pandas as pd
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
import seaborn as sns
% matplotlib inline

# import data
df = pd.read_csv("https://raw.githubusercontent.com/selva86/datasets/master/mpg_ggplot2.csv")
df_counts = df.groupby(['hwy','cty']).size().reset_index(name = 'counts')

# draw stripplot
fig ,ax = plt.subplots(figsize = (16,10),dpi= 80)
sns.stripplot(df_counts.cty,df_counts.hwy,size =df_counts.counts*2,ax=ax)

# decoration
plt.title('Counts Plot - Size of circle is bigger as more points overlap',fontsize = 22)
plt.show()