Python 如何将 x 轴设置为散景图上的日期时间？
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How can I set the x-axis as datetimes on a bokeh plot?
提问by Wilfred Hughes
I'm using bokeh with an ipython notebook.
我在 ipython 笔记本上使用散景。
I want to plot a line graph in bokeh using a pandas DataFrame containing datetimes:
我想使用包含日期时间的 Pandas DataFrame 在散景中绘制折线图：
import pandas as pd
from datetime import datetime as dt
from bokeh.io import output_notebook
from bokeh.charts import Bar, Line, show
df = pd.DataFrame(data=[1,2,3],
index=[dt(2015, 1, 1), dt(2015, 1, 2), dt(2015, 1, 3)],
columns=['foo'])
output_notebook()
show(Line(df))
However, bokeh uses microseconds! Why is this? How do I fix it?
但是，散景使用微秒！为什么是这样？我如何解决它？
回答by euri10
is that ok ?
这可以吗 ？
import pandas as pd
from math import pi
from datetime import datetime as dt
from bokeh.io import output_file
from bokeh.charts import show
from bokeh.models import DatetimeTickFormatter
from bokeh.plotting import figure
df = pd.DataFrame(data=[1,2,3],
index=[dt(2015, 1, 1), dt(2015, 1, 2), dt(2015, 1, 3)],
columns=['foo'])
p = figure(plot_width=400, plot_height=400)
p.line(df.index, df['foo'])
p.xaxis.formatter=DatetimeTickFormatter(
hours=["%d %B %Y"],
days=["%d %B %Y"],
months=["%d %B %Y"],
years=["%d %B %Y"],
)
p.xaxis.major_label_orientation = pi/4
output_file('myplot.html')
show(p)
回答by jsignell
FWIW, the default behavior has changed since the question was first posted. The original code now yields:
FWIW，自问题首次发布以来，默认行为已更改。原始代码现在产生：
回答by Emmanuel
As of bokeh 0.12.3, you can now do:
从散景 0.12.3 开始，您现在可以执行以下操作：
p = figure(..., x_axis_type='datetime', ...)
