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来构建带有日期时间滑块的 iPyWidget.现在很容易在整数或浮点范围内滑动(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，使用这些构建某种滑块，然后将滑块上的显示标签转换回日期.然而，这看起来很笨拙.有没有人有更流畅的解决方案?

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.我不得不编写自己的类来做一个日期范围选择器.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

使用起来相对简单:

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

享受;-)

这篇关于带日期滑块的 iPyWidget?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！