python - 从 groupby Pandas 数据框中绘制堆积图

Question

我有一个数据框，如下所示。首先，我想要每个日期的每个状态的计数。例如，2017-11-02 中“已完成”的数量是 2。我想要这样的堆栈图。

                   status              start_time                end_time  \
0             COMPLETED 2017-11-01 19:58:54.726 2017-11-01 20:01:05.414   
1             COMPLETED 2017-11-02 19:43:04.000 2017-11-02 19:47:54.877   
2     ABANDONED_BY_USER 2017-11-03 23:36:19.059 2017-11-03 23:36:41.045   
3  ABANDONED_BY_TIMEOUT 2017-10-31 17:02:38.689 2017-10-31 17:12:38.844   
4             COMPLETED 2017-11-02 19:35:33.192 2017-11-02 19:42:51.074   

这是数据框的 csv:

status,start_time,end_time
COMPLETED,2017-11-01 19:58:54.726,2017-11-01 20:01:05.414
COMPLETED,2017-11-02 19:43:04.000,2017-11-02 19:47:54.877
ABANDONED_BY_USER,2017-11-03 23:36:19.059,2017-11-03 23:36:41.045
ABANDONED_BY_TIMEOUT,2017-10-31 17:02:38.689,2017-10-31 17:12:38.844
COMPLETED,2017-11-02 19:35:33.192,2017-11-02 19:42:51.074
ABANDONED_BY_TIMEOUT,2017-11-02 19:35:33.192,2017-11-02 19:42:51.074

要实现这一点:

df_['status'].astype('category')
df_ = df_.set_index('start_time')
grouped = df_.groupby('status')
color = {'COMPLETED':'green','ABANDONED_BY_TIMEOUT':'blue',"MISSED":'red',"ABANDONED_BY_USER":'yellow'}

for key_, group in grouped:
   print(key_)
   df_ = group.groupby(lambda x: x.date).count()
   print(df_)
   df_['status'].plot(label=key_,kind='bar',stacked=True,\
   color=color[key_],rot=90)
plt.show()

下面的输出是:

ABANDONED_BY_TIMEOUT
            status  end_time  
2017-10-31       1         1       
ABANDONED_BY_USER
            status  end_time  
2017-11-03       1         1            
COMPLETED
            status  end_time  
2017-11-01       1         1             
2017-11-02       2         2 

我们可以看到这里的问题是只考虑最后两个日期“2017-11-01”和“2017-11-02”，而不是所有类别中的所有日期。我该如何解决这个问题？欢迎使用全新的堆叠图方法。在此先致谢。

Answer 1

import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns

df_ = pd.read_csv('sam.csv')
df_['date'] = pd.to_datetime(df_['start_time']).dt.date
df_ = df_.set_index('start_time')


grouped = pd.DataFrame(df_.groupby(['date', 'status']).size().reset_index(name="count")).pivot(columns='status', index='date', values='count')
print(grouped)
sns.set()

grouped.plot(kind='bar', stacked=True)

# g = grouped.plot(x='date', kind='bar', stacked=True)
plt.show()

输出: