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问题 Suppose I have the following dataframe: pd.DataFrame({'col1': ["a", "a", np.nan, np.nan, np.nan], 'override1': ["b", np.nan, "b", np.nan, np.nan], 'override2': ["c", np.nan, np.nan, "c", np.nan]}) col1 override1 override2 0 a b c 1 a NaN NaN 2 NaN b NaN 3 NaN NaN c 4 NaN NaN NaN Is there a way to collapse the 3 columns into one column, where override2 overrides override1 , which overrides col1 , however, in case there is NaN, then the values bofore is to be kept? Also, I am mainly looking for

问题 Suppose I have the following dataframe: pd.DataFrame({'col1': ["a", "a", np.nan, np.nan, np.nan], 'override1': ["b", np.nan, "b", np.nan, np.nan], 'override2': ["c", np.nan, np.nan, "c", np.nan]}) col1 override1 override2 0 a b c 1 a NaN NaN 2 NaN b NaN 3 NaN NaN c 4 NaN NaN NaN Is there a way to collapse the 3 columns into one column, where override2 overrides override1 , which overrides col1 , however, in case there is NaN, then the values bofore is to be kept? Also, I am mainly looking for

问题 I have used react bootstrap navbar also used react-scroll for smooth navigation. It's working fine but navbar is not collapsing when clicking any nav item in the responsive mode. Packages import React, { Component } from "react"; import { NavLink } from "react-router-dom"; import { Link } from "react-scroll"; import { LinkContainer } from "react-router-bootstrap"; import { Navbar, Container, NavDropdown, Nav, Dropdown } from "react-bootstrap"; Navbar <Navbar sticky="top" id="navbar" bg="light

问题 I'm working on a responsive wordpress theme with Bootstrap v3.0.2. In mobile/tablet browsers instead of the whole menu i need to show the Bootstrap toggle button. My button is showing, but when I click on it nothing is happening. This is code I wrote in my header.php : <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon

问题 I'm working on a responsive wordpress theme with Bootstrap v3.0.2. In mobile/tablet browsers instead of the whole menu i need to show the Bootstrap toggle button. My button is showing, but when I click on it nothing is happening. This is code I wrote in my header.php : <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon

问题 I am using Angular Material for displaying content. My TS code is: import { Component, OnInit, ViewChild } from '@angular/core'; import { AdminReassignTaskService } from 'src/app/services/admin-reassign-task.service' import { Location } from '@angular/common'; import { trigger, state, transition, animate, style } from '@angular/animations'; @Component({ selector: 'app-admin-reassign-task', templateUrl: './admin-reassign-task.component.html', animations: [ trigger('detailExpand', [ state(

问题 I am using Angular Material for displaying content. My TS code is: import { Component, OnInit, ViewChild } from '@angular/core'; import { AdminReassignTaskService } from 'src/app/services/admin-reassign-task.service' import { Location } from '@angular/common'; import { trigger, state, transition, animate, style } from '@angular/animations'; @Component({ selector: 'app-admin-reassign-task', templateUrl: './admin-reassign-task.component.html', animations: [ trigger('detailExpand', [ state(

问题 I have a data set that looks like this Id Subject Date Vitals Value 10 John 2001-05-29 HeartRate 65 10 John 2001-05-29 HeartRate 68 10 John 2001-05-29 BP-Arterial 48 10 John 2001-05-29 PulseRate 64 34 Pete 2005-08-15 HeartRate 68 34 Pete 2005-08-15 BP-Arterial 56 10 John 2004-09-25 HeartRate 65 10 John 2004-09-25 BP-Arterial 64 10 John 2004-09-25 PulseRate 63 34 Pete 2007-07-21 BP-Arterial 68 34 Pete 2007-07-21 PulseRate 56 I want to do two things, 1) group by Vitals. 2) Count the number of

问题 As you can see in this picture, I've got an orange div inside a green div with no top border. The orange div has a 30px top margin, but it's also pushing the green div down. Of course, adding a top border will fix the issue, but I need the green div to be top borderless. What could I do? .body { border: 1px solid black; border-top: none; border-bottom: none; width: 120px; height: 112px; background-color: lightgreen; } .body .container { background-color: orange; height: 50px; width: 50%;

问题 so I'm having a hard time understanding the circumstances under which a float can have margins collapse through it and how that affects the position of the float. I've included a page that seems to show two different behaviors in the same page. The red float seems to be positioned before the margins that collapsed through it, whereas the blue ones down below seem to have the margins collapse through them and then be positioned after those margins have collapsed. Any help would be much