Html 查找XPATH表达式

对于以下html：

<tr>
    <td class="first">AUD</td>
    <td> 0.00 </td>
    <td> 1,305.01 </td>
    <td> 1,305.01 </td>
    <td> -65.20 </td>
    <td> 0.00 </td>
    <td> 0.00 </td>
    <td> 1,239.81 </td>
    <td class="fx-rate"> 0.98542 </td>
</tr>

使用以下命令：

//td[@class = 'first' and normalize-space() = 'AUD']/parent::tr/td[@class = 'fx-rate']

或者更清楚：

//tr[td[@class="first1" and normalize-space()="AUD"]]/td[@class="fx-rate"]

---

这就是我使用部分XPath解决问题的方法：

### get all the elements via xpath
currencies = driver.find_elements_by_xpath("//td[@class='first']")
fx_rates = driver.find_elements_by_xpath("//td[@class='fx-rate']")

### build a list and zip it to get the k,v pairs
fx_values = [fx.text for fx in fx_rates if fx.text]
currency_text = [currency.text for currency in currencies if currency.text]
zip(currency_text,fx_values)[1:]

---

我当然更喜欢第二种表达方式。从左到右更容易阅读。

### get all the elements via xpath
currencies = driver.find_elements_by_xpath("//td[@class='first']")
fx_rates = driver.find_elements_by_xpath("//td[@class='fx-rate']")

### build a list and zip it to get the k,v pairs
fx_values = [fx.text for fx in fx_rates if fx.text]
currency_text = [currency.text for currency in currencies if currency.text]
zip(currency_text,fx_values)[1:]