Pandas - Bar and Line Chart - Datetime axis

Question

I am trying to plot a bar chart and a line overlay, where my data has datetime as an index. This is the code:

import pandas as pd
import numpy as np
dates = pd.date_range('2019-01-01', '2019-01-31', freq='B')
df = pd.DataFrame(index=dates, 
              columns=['a', 'b', 'c'],
              data = np.random.randn(len(dates), 3))

fig, ax = plt.subplots()
df.plot.bar(ax=ax)
df.sum(axis=1).plot(ax=ax)

Unfortunately, it only ends up showing the last chart requested.

I'm using

python 3.6.8
pandas 0.24.0
matplotlib 3.0.2

Regards

Answer 1

Following the comment by @ImportanceOfBeingErnest I think the best way to answer this is to use the use_index=False kwarg. For the data format etc, this is another problem and depends on what one wants to achieve.

import pandas as pd
import numpy as np
dates = pd.date_range('2019-01-01', '2019-01-31', freq='B')
df = pd.DataFrame(index=dates,
                  columns=['a', 'b', 'c'],
                  data = np.random.randn(len(dates), 3))

fig, ax = plt.subplots()
df.plot.bar(ax=ax)
df.sum(axis=1).plot(ax=ax, use_index=False)