python - Bokeh histogram will not plot, is there a solution to this old issue -
my issue seems post (albeit column types may different):
cannot plot histogram on ubuntu 14.04
the code straight out of docs http://bokeh.pydata.org/en/0.10.0/docs/user_guide/charts.html#histograms
i couldn't comment on post needed ask again if solution found...
my system suse. trying plot simple histogram of datetimes pandas df series.
>>>df acq_date 0 2017-01-28 1 2017-01-28 ... ... 456365 2017-07-25 456366 2017-07-25 >>>hist = histogram(df['acq_date'], title="fire frequency") 2017-08-22 11:56:15,240 error running application handler <bokeh.application.handlers.script.scripthandler object @ 0x2b6cc2c8f358>: expected element of either column(float) or column(string), got array(['2017- 01-28t00:00:00.000000000', '2017-01-28t00:00:00.000000000', '2017-01-28t00:00:00.000000000', ..., '2017-07-25t00:00:00.000000000', '2017-07-25t00:00:00.000000000', '2017-07-25t00:00:00.000000000'], dtype='datetime64[ns]') file "properties.py", line 676, in validate: raise valueerror("expected element of either %s, got %r" % (nice_join (self.type_params), value)) traceback (most recent call last): file "/home/byed/venv36/lib/python3.6/site- packages/bokeh/application/handlers/code_runner.py", line 81, in run exec(self._code, module.__dict__) file "/home/byed/job/fire/report_fire_points.py", line 118, in <module> hist = histogram(df['acq_date'], title="fire frequency") #, tools='pan,wheel_zoom,box_select,reset') file "/home/byed/venv36/lib/python3.6/site- packages/bkcharts/builders/histogram_builder.py", line 107, in histogram return create_and_build(histogrambuilder, data, **kw) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/builder.py", line 56, in create_and_build chart.add_builder(builder) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/chart.py", line 155, in add_builder builder.create(self) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/builder.py", line 512, in create chart.add_renderers(self, renderers) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/chart.py", line 150, in add_renderers self.renderers += renderers file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/property/containers.py", line 76, in wrapper result = func(self, *args, **kwargs) file "/home/byed/venv36/lib/python3.6/site- packages/bokeh/core/property/containers.py", line 172, in __iadd__ return super(propertyvaluelist, self).__iadd__(y) file "/home/byed/venv36/lib/python3.6/site- packages/bkcharts/builders/bar_builder.py", line 221, in yield_renderers **group_kwargs) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/glyphs.py", line 950, in __init__ super(histogramglyph, self).__init__(**kwargs) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/glyphs.py", line 490, in __init__ super(aggregateglyph, self).__init__(**kwargs) file "/home/byed/venv36/lib/python3.6/site-packages/bkcharts/models.py", line 83, in __init__ super(compositeglyph, self).__init__(**properties) file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/has_props.py", line 246, in __init__ setattr(self, name, value) file "/home/byed/venv36/lib/python3.6/site- packages/bokeh/core/has_props.py", line 274, in __setattr__ super(hasprops, self).__setattr__(name, value) file "/home/byed/venv36/lib/python3.6/site- packages/bokeh/core/property/descriptors.py", line 495, in __set__ self._internal_set(obj, value, setter) file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/property/descriptors.py", line 713, in _internal_set value = self.property.prepare_value(obj, self.name, value) file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/property/bases.py", line 290, in prepare_value raise e file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/property/bases.py", line 283, in prepare_value self.validate(value) file "/home/byed/venv36/lib/python3.6/site-packages/bokeh/core/properties.py", line 676, in validate raise valueerror("expected element of either %s, got %r" % (nice_join (self.type_params), value)) valueerror: expected element of either column(float) or column(string), got array(['2017-01-28t00:00:00.000000000', '2017-01-28t00:00:00.000000000', '2017-01-28t00:00:00.000000000', ..., '2017-07-25t00:00:00.000000000', '2017-07-25t00:00:00.000000000', '2017-07-25t00:00:00.000000000'], dtype='datetime64[ns]') any appreciated.
cheers n thanks
don't use bokeh.charts (now separate bkcharts project), including histogram. bkcharts project abandoned unmaintained. however, it's pretty trivial create histograms using bokeh.plotting stable , well-supported core api of bokeh:
import numpy np bokeh.io import show, output_file bokeh.plotting import figure data = np.random.normal(0, 0.5, 1000) hist, edges = np.histogram(data, density=true, bins=50) x = np.linspace(-2, 2, 1000) p = figure() p.quad(top=hist, bottom=0, left=edges[:-1], right=edges[1:], line_color="white") output_file("hist.html") show(p) 
alternatively, if want very-high level statistical charting api on top of bokeh, check out holoviews:
holoviews better bokeh.charts in every way, , more importantly maintained active team. officially endorsed core bokeh dev team best , supported very-high-level api on top of bokeh going forward.
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