布置DatePicker小部件时，如果它们位于小部件框中，则布局不遵守row（）分组，如示例所示，请参见注释，
from datetime import datetime, timedelta
from bokeh.embed import components
from bokeh.models.widgets.inputs import DatePicker
from bokeh.layouts import column, row, widgetbox, layout
from flask import Flask
app = Flask(__name__)
@app.route("/", methods=['GET'])
def test():
text = """<!DOCTYPE html>
<html lang="en">
<head>
<link href="https://cdn.pydata.org/bokeh/release/bokeh-0.12.15.min.css" rel="stylesheet" type="text/css">
<script src="https://cdn.pydata.org/bokeh/release/bokeh-0.12.15.min.js"></script>
<link href="https://cdn.pydata.org/bokeh/release/bokeh-widgets-0.12.15.min.css" rel="stylesheet" type="text/css">
<script src="https://cdn.pydata.org/bokeh/release/bokeh-widgets-0.12.15.min.js"></script>
<meta charset="UTF-8">
</head>
<body>"""
d_yesterday = datetime.today() - timedelta(days=1)
start = DatePicker(title="Start Date", min_date=d_yesterday, max_date=datetime.today(), value=datetime.today())
end = DatePicker(title="End Date", min_date=d_yesterday, max_date=datetime.today(), value=datetime.today())
left = DatePicker(title="Left Date", min_date=d_yesterday, max_date=datetime.today(), value=datetime.today())
right = DatePicker(title="Right Date", min_date=d_yesterday, max_date=datetime.today(), value=datetime.today())
doc_layout = layout(sizing_mode='scale_width')
# This does not work, the row DatePickers appear as a column...
#doc_layout.children.append(column(widgetbox(start, end)))
#doc_layout.children.append(row(widgetbox(left, right)))
# this works, but doesn't use widgetbox...
doc_layout.children.append(column(start, end))
doc_layout.children.append(row(left, right))
_script, _div = components(doc_layout)
text += "{}{}".format(_script, _div)
text += """</body></html>"""
return text
app.run(host="0.0.0.0", port=6800)
python 2.7.11，Windows操作系统，Chrome和Edge中的结果相同。