Select by class and ID with XPATH

Here's some HTML code that is similar to code you encountered in the last chapter (already read into an HTML document called weather_html):

<html>
  <body>
    <div id = 'first'>
      <h1 class = 'big'>Berlin Weather Station</h1>
      <p class = 'first'>Temperature: 20°C</p>
      <p class = 'second'>Humidity: 45%</p>
    </div>
    <div id = 'second'>...</div>
    <div id = 'third'>
      <p class = 'first'>Sunshine: 5hrs</p>
      <p class = 'second'>Precipitation: 0mm</p>
    </div>
  </body>
</html>

For this chapter, this code looks a bit more like real life. Your goal is to extract the precipitation reading from this weather station. Unfortunately, it can't be directly referenced through an ID.

Let's do this by setting up the building blocks step by step and then using them in combination!

Это упражнение является частью курса

Web Scraping in R

Посмотреть курс

Интерактивное практическое упражнение

Попробуйте выполнить это упражнение, дополнив этот пример кода.

# Select all p elements
weather_html %>%
	html_elements(xpath = '___')

Редактировать и запускать код