python - 尝试 If Elif Else 语句，只返回两个值
问题描述
我正在尝试编写 If Elif Else 语句，我可能会错误地处理这个问题。我已经用 Pandas 构建了一个 DataFrame，我试图做的是表示列中 3 个状态中的 1 个。特殊订单，准备发货，只是空白或连字符。我已经尝试了几种不同的方法，但似乎无法让它发挥作用。我试图做的是，如果某物的价格为 0.00 美元，则返回第三个状态，即空白或连字符。目前，无论我做什么，我都会收到特殊订单或准备发货。
这是来自网站的代码，我很抱歉它是如此混乱，它只是从它们格式化的方式。
<table cellspacing="0" class="item width-100" summary="Wish list">
<tr>
<td><input type="checkbox" name="wish_products" value="583454" class="wish_check available " /></td>
<td class="image">
<a title="A Walk Through Hell Complete Hc" href="/a-walk-through-hell-complete-hc.html">
<img src="https://www.cheapgraphicnovels.com/images/P/A%20WALK%20THROUGH%20HELL%20COMPLETE%20HC.jpg" width="97" alt="A WALK THROUGH HELL COMPLETE HC" title="A WALK THROUGH HELL COMPLETE HC" /> </a>
</td>
<td class="details">
<a title="A Walk Through Hell Complete Hc" href="/a-walk-through-hell-complete-hc.html" class="product-title">A WALK THROUGH HELL COMPLETE HC</a>
<div class="descr"><p>
<span style="font-size:14px;">Garth Ennis' Complete Masterpiece of Terror in One Unrelenting Hardcover! So these two FBI agents walk into a warehouse... Special Agents Shaw and McGregor handle the routine cases nowadays, which is just the way Shaw likes it.</span></p>
<p>
</p>
<p>
<strong><span style="font-size:14px;">ESTIMATED ARRIVAL: TBA</span></strong></p>
</div>
<span class="product-price-text">
<span class="currency">$29.99</span> x <input type="text" size="3" name="quantity" id="qty_583454" value="1" /> =
</span>
<span class="price">
<span class="currency">$29.99</span>
</span>
<span class="market-price">
</span>
</td>
</tr>
<tr><td> </td>
<td class="buttons-row">
<a class="simple-button simple-delete-button" href="cart.php?mode=wldelete&wlitem=583454&eventid=" title="Delete item"><span>Delete item</span></a>
</td>
<td class="buttons-row">
<button class="button light-button" type="submit" title="Update">
<span class="button-right"><span class="button-left">Update</span></span>
</button>
<div class="button-separator"></div>
<div style="float:left">
<a href="javascript://" onclick="javascript: self.location = 'cart.php?mode=wl2cart&wlitem=583454&amount='+$('#qty_583454').val()"><img src="/skin/common_files/images/add_cart_btn_hov.png" border="0" alt="" /></a>
</div>
</td>
</tr>
<tr>
<td> </td>
<td colspan="2">
<div class="ordernow">This title is available by Special Order only. Please read our <a href="/covid-19.html">COVID-19 Update</a> prior to ordering.</div>
</td>
</tr>
<tr>
<td> </td>
<td>
</td>
</tr>
</table>
<table cellspacing="0" class="item width-100" summary="Wish list">
<tr>
<td><input type="checkbox" name="wish_products" value="584040" class="wish_check " /></td>
<td class="image">
<a title="Abe Sapien Dark And Terrible Vol 01 Hc" href="/abe-sapien-dark-and-terrible-vol-01-hc.html">
<img src="https://www.cheapgraphicnovels.com/images/P/ABE%20SAPIEN%20DARK%20%26%20TERRIBLE%20HC%20VOL%2001.jpg" width="98" alt="ABE SAPIEN DARK AND TERRIBLE VOL 01 HC " title="ABE SAPIEN DARK AND TERRIBLE VOL 01 HC " /> </a>
</td>
<td class="details">
<a title="Abe Sapien Dark And Terrible Vol 01 Hc" href="/abe-sapien-dark-and-terrible-vol-01-hc.html" class="product-title">ABE SAPIEN DARK AND TERRIBLE VOL 01 HC </a>
<div class="descr"><p>
<span style="font-size:14px;">On the run from the BPRD, a newly mutated Abe Sapien-more inhuman than before-travels across a United States transformed and overrun by monsters. Abe's search for the truth about himself-or his race away from his fate-mirrors the quest of an ancient necromancer to seize control of a world literally going to hell. </span></p>
</div>
<span class="product-price-text">
<span class="currency">$24.49</span> x <input type="text" size="3" name="quantity" id="qty_584040" value="0" /> =
</span>
<span class="price">
<span class="currency">$0.00</span>
</span>
<span class="market-price">
</span>
<strong>Out of stock</strong>
</td>
</tr>
<tr><td> </td>
<td class="buttons-row">
<a class="simple-button simple-delete-button" href="cart.php?mode=wldelete&wlitem=584040&eventid=" title="Delete item"><span>Delete item</span></a>
</td>
<td class="buttons-row">
<button class="button light-button" type="submit" title="Update">
<span class="button-right"><span class="button-left">Update</span></span>
</button>
<div class="button-separator"></div>
</td>
</tr>
<tr>
<td> </td>
<td>
</td>
</tr>
</table>
到目前为止，这是我的代码，它起作用了，我只是无法让 If、Elif、Else 部分在特殊命令下工作。
titles = []
links = []
price = []
special_order = []
addtocart = []
soup = BeautifulSoup(driver.page_source, "html.parser")
cgn_items = soup.find_all('table', class_='item width-100')
sleep(randint(2,10))
for container in cgn_items:
#name
name = container.find('a', class_='product-title').text.strip()
titles.append(name)
#link
link = container.find('td', attrs={'class' : 'details'})
for div in link:
linking = container.find('a')['href']
link = "https://www.cheapgraphicnovels.com" + linking
links.append(link)
#price
pricing = container.find('span', class_='price')
if pricing:
price.append(pricing.text.strip())
else:
price.append('-')
#special order
special = container.find('div', class_='ordernow')
if special:
special_order.append('Special Order')
else:
special_order.append('Ready to Ship')
#addtocart
cart = container.find('img', {"src" : "/skin/common_files/images/add_cart_btn_hov.png"})
if cart:
addtocart.append('In Stock')
else:
addtocart.append('Out of Stock')
cgn_wishlist = pd.DataFrame({
'book': titles,
'link': links,
'price': price,
'special_order': special_order,
'cart': addtocart
})
cgn_wishlist.to_csv('cgn_wishlist.csv', index=False)
目前，如果它找到它知道分配特殊订单的 ordernow 类，它就会起作用，对于其他一切它只是准备好发货。但我想要的是任何价格为 0.00 美元的商品为空白或“-”，其余商品（由于价格高于 0.00 美元而被视为库存商品）将获得“准备发货”
对此的任何帮助将不胜感激，谢谢！
解决方案
据我所知，您只需要elif在“特殊订单”代码中添加一个附加项，如下所示：
#special order
special = container.find('div', class_='ordernow')
if special:
special_order.append('Special Order')
elif price[-1] in ['-', '$0.00']:
special_order.append('-')
else:
special_order.append('Ready to Ship')
这将检查价格是否为-or$0.00然后添加-。
这应该为您提供数据框，例如：
book link price special_order cart
0 A WALK THROUGH HEL... https://www.cheapg... $29.99 Special Order In Stock
1 ABE SAPIEN DARK AN... https://www.cheapg... $0.00 - Out of Stock
price是您的价格列表，列表中的最后一个条目是price[-1]，负值从列表末尾开始（price[0]将是第一个值）。Python 的in运算符检查一个值是否与列表中的任何值匹配。由于您有两个测试，因此可以将它们制成要测试的值列表，例如['-', '$0.00']
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