Question

我正在尝试根据日期时间索引创建一个简单的折线图。但我收到一条错误消息。

#standard packages
import numpy as np
import pandas as pd

#visualization
%matplotlib inline
import matplotlib.pylab as plt

#create weekly datetime index
edf = pd.read_csv('C:\Users\j~\raw.csv', parse_dates=[6])
edf2 = edf[['DATESENT','Sales','Traffic']].copy()
edf2['DATESENT']=pd.to_datetime(edf2['DATESENT'],format='%m/%d/%Y')
edf2 = edf2.set_index(pd.DatetimeIndex(edf2['DATESENT']))
edf2.resample('w').sum()
edf2

#output

            SALES
DATESENT     
2014-01-05  476
2014-01-12  67876

然后我尝试绘制（最简单的线图可能按周查看销售额）

#linegraph
edf3.plot(x='DATESENT',y='Sales')

但我收到此错误消息

KeyError：'DATESENT'

Answer 1

您获得KeyError因为'DATESENT'是索引，而不是edf3中的列。你可以这样做：

#linegraph
edf3.plot(x=edf3.index,y='Sales')

python matplotlib plot datetime index

1 个答案: