带日期滑块的iPyWidget? [英] iPyWidget with date slider?

问题描述

我想知道是否有一种简单的方法可以使用日期时间滑块构建iPyWidget.现在，您可以轻松地在整数或浮点数范围内滑动(例如，数字1-10，小数0.01、0.02，...).

I am wondering if there's an easy way to build an iPyWidget with a datetime slider. Right now it is easy to slide over integer or floating point ranges (e.g. numbers 1-10, decimals 0.01, 0.02, ...).

我想您可以将日期转换为浮点数或整数，使用它们来构建某种类型的滑块，然后将其转换回日期以作为滑块上的显示标签.但是，这似乎很笨拙.有谁有一个更流畅的解决方案?

I imagine you could convert dates to floats or integers, build some sort of slider using these, and then convert back to dates for the display labels on the slider. However, this seems clunky. Does anyone have a smoother solution?

推荐答案

我最近遇到了同样的问题.我必须编写自己的课程来做日期范围选择器.这是我的代码:

I had the same issue recently. I had to write my own class to do a daterange picker. Here is my code:

import pandas as pd
import ipywidgets as widgets
from IPython.display import display

class DateRangePicker(object):
    def __init__(self,start,end,freq='D',fmt='%Y-%m-%d'):
        """
        Parameters
        ----------
        start : string or datetime-like
            Left bound of the period
        end : string or datetime-like
            Left bound of the period
        freq : string or pandas.DateOffset, default='D'
            Frequency strings can have multiples, e.g. '5H' 
        fmt : string, defauly = '%Y-%m-%d'
            Format to use to display the selected period

        """
        self.date_range=pd.date_range(start=start,end=end,freq=freq)
        options = [(item.strftime(fmt),item) for item in self.date_range]
        self.slider_start = widgets.SelectionSlider(
            description='start',
            options=options,
            continuous_update=False
        )
        self.slider_end = widgets.SelectionSlider(
            description='end',
            options=options,
            continuous_update=False,
            value=options[-1][1]
        )

        self.slider_start.on_trait_change(self.slider_start_changed, 'value')
        self.slider_end.on_trait_change(self.slider_end_changed, 'value')

        self.widget = widgets.Box(children=[self.slider_start,self.slider_end])

    def slider_start_changed(self,key,value):
        self.slider_end.value=max(self.slider_start.value,self.slider_end.value)
        self._observe(start=self.slider_start.value,end=self.slider_end.value)

    def slider_end_changed(self,key,value):
        self.slider_start.value=min(self.slider_start.value,self.slider_end.value)
        self._observe(start=self.slider_start.value,end=self.slider_end.value)

    def display(self):
        display(self.slider_start,self.slider_end)

    def _observe(self,**kwargs):
        if hasattr(self,'observe'):
            self.observe(**kwargs)

def fct(start,end):
    print start,end

使用它相对简单:

w=DateRangePicker(start='2016-08-02',end="2016-09-02",freq='D',fmt='%Y-%m-%d')
w.observe=fct
w.display()

享受;-)

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