Python 使用熊猫阅读html时遇到问题_Python_Html_Pandas_Lxml

Python 使用熊猫阅读html时遇到问题

python html pandas

Python 使用熊猫阅读html时遇到问题,python,html,pandas,lxml,Python,Html,Pandas,Lxml,我的目标是从HTML表中提取数据，特别是对应于最近日期（在本例中为5/20）的数据以下是相应的HTML代码： <html> <head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>FW: NEFS 2 Available Quota 5/21</title> <link rel="important stylesheet

我的目标是从HTML表中提取数据，特别是对应于最近日期（在本例中为5/20）的数据

以下是相应的HTML代码：

<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>FW: NEFS 2 Available Quota 5/21</title>
<link rel="important stylesheet" href="">
<style>div.headerdisplayname {font-weight:bold;}</style></head>
<body>
<table border=0 cellspacing=0 cellpadding=0 width="100%" class="header-part1"><tr><td><b>Subject: </b>FW: NEFS 2 Available Quota 5/21</td></tr><tr><td><b>From: </b>Claire Fitz-Gerald <claire@capecodfishermen.org></td></tr><tr><td><b>Date: </b>5/21/2014 10:08 AM</td></tr></table><br>
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o\:* {behavior:url(#default#VML);}
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    {margin:0in;
    margin-bottom:.0001pt;
    font-size:11.0pt;
    font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
    {mso-style-priority:99;
    color:blue;
    text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
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    color:windowtext;}
span.title1
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    font-weight:normal;}
span.EmailStyle19
    {mso-style-type:personal-reply;
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    color:#1F497D;}
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@page WordSection1
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div.WordSection1
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<o:shapedefaults v:ext="edit" spidmax="1026" />
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Please see the below quota listings.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#1F497D'>Claire Fitz-Gerald<o:p></o:p></span></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Franklin Gothic Book","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></i></p><p class=MsoNormal><b><span style='font-family:"Franklin Gothic Demi","sans-serif";color:#002776'>Cape Cod Commercial Fishermen's Alliance<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Franklin Gothic Book","sans-serif";color:#DE3500'>~ Small Boats.&nbsp; Big Ideas. ~</span></b><b><span style='color:#DE3500'><o:p></o:p></span></b></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> David Leveille [mailto:nefs02@gmail.com] <br><b>Sent:</b> Wednesday, May 21, 2014 8:50 AM<br><b>To:</b> David Leveille<br><b>Subject:</b> NEFS 2 Available Quota 5/21<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p>&nbsp;</o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial","sans-serif";color:#1F487E'>AVAILABLE QUOTA FY 2014</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="71%" style='width:71.28%'><tr><td width=220 style='width:164.95pt;border:none;border-bottom:solid windowtext 1.0pt;background:#8BCDFF;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>ID <o:p></o:p></span></b></p></td><td width=161 style='width:120.75pt;border:none;border-bottom:solid windowtext 1.0pt;background:#8BCDFF;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='mso-line-height-alt:15.0pt'><b><span style='font-size:18.0pt;font-family:"Arial","sans-serif";color:black'>Available Quota <o:p></o:p></span></b></p></td><td width=189 style='width:141.75pt;border:none;border-bottom:solid windowtext 1.0pt;background:#8BCDFF;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='mso-line-height-alt:15.0pt'><b><span style='font-size:18.0pt;font-family:"Arial","sans-serif";color:black'>Live Weight Pounds <o:p></o:p></span></b></p></td><td width=126 style='width:94.55pt;border:none;border-bottom:solid windowtext 1.0pt;background:#8BCDFF;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='mso-line-height-alt:15.0pt'><b><span style='font-size:18.0pt;font-family:"Arial","sans-serif";color:black'>Price <o:p></o:p></span></b></p></td><td width=168 style='width:125.95pt;border:none;border-bottom:solid windowtext 1.0pt;background:#8BCDFF;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='mso-line-height-alt:15.0pt'><b><span style='font-size:18.0pt;font-family:"Arial","sans-serif";color:black'>Date Posted <o:p></o:p></span></b></p></td></tr><tr><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>1724<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>GOM COD<br>GOM HADD<br>GOM BB<br>GREYSOLE<br>DABS<br>GOM YT<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>2328<br>445<br>3007<br>850<br>3101<br>1995<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>Package<o:p></o:p></span></p><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'><o:p>&nbsp;</o:p></span></p><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>$9,000<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/20<o:p></o:p></span></p></td></tr><tr><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>1578<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>GBE COD<br>GBW COD<br>GB BB<br>GB YT<br>SNE BB<br>SNE YT<br>GOM BB<br>Whake<br>POLL<br>RED<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>538<br>5894<br>1755<br>243<br>490<br>153<br>3965<br>2727<br>9227<br>15060<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>$1.00<br>$0.40<br>$0.20<br>$1.00<br>$0.45<br>$0.50<br>$0.15<br>$0.20<br>$0.01<br>$0.01<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/20<o:p></o:p></span></p></td></tr><tr><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>310<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>GBE COD<br>GBW COD<br>DABS<br>WHAKE<br>POLL<br>RED<br>SNE BB<br>GOM BB<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>825<br>9033<br>1241<br>3120<br>65234<br>76610<br>1688<br>1195<br>2121<br>7285<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>Package<o:p></o:p></span></p><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'><o:p>&nbsp;</o:p></span></p><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>$15,000<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/20<o:p></o:p></span></p></td></tr><tr style='height:23.25pt'><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt;height:23.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>347<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt;height:23.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>SNE BB<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt;height:23.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>8,000<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt;height:23.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>$0.50<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt;height:23.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/7<o:p></o:p></span></p></td></tr><tr><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>1878A<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>GOM COD<br>GOM HADD<br>SNE BB<br>GOM BB<br>GB BB<br>GREYSOLE<br>GOM YT<br>SNE YT<br>POLL<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>6188<br>635<br>3916<br>7873<br>6762<br>3358<br>9776<br>271<br>186550<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>$1.95<br>$1.35<br>$0.50<br>$0.50<br>$0.20<br>$1.40<br>$1.20<br>$0.50<br>$0.01<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/12<o:p></o:p></span></p></td></tr><tr><td width=220 style='width:164.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>1878B<o:p></o:p></span></p></td><td width=161 style='width:120.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>GBE COD<br>GBW COD<br>GB YT<o:p></o:p></span></p></td><td width=189 style='width:141.75pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>1113<br>12186<br>850<o:p></o:p></span></p></td><td width=126 style='width:94.55pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>Package<br>$10,000<o:p></o:p></span></p></td><td width=168 style='width:125.95pt;border:solid windowtext 1.0pt;background:white;padding:2.25pt 2.25pt 2.25pt 2.25pt'><p class=MsoNormal style='line-height:15.0pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'>5/12<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p>&nbsp;</o:p></p><p class=MsoNormal><o:p>&nbsp;</o:p></p><p class=MsoNormal>David Leveille<o:p></o:p></p><p class=MsoNormal>II Northeast Fishery Sector Inc.<o:p></o:p></p><p class=MsoNormal>10 Witham Street<o:p></o:p></p><p class=MsoNormal>Gloucester, MA. 01930<o:p></o:p></p><p class=MsoNormal>Cell 978 375 3509<o:p></o:p></p><p class=MsoNormal>Fax 978 281 1555<o:p></o:p></p><p class=MsoNormal>Web <a href="http://nefs2.com/">http://nefs2.com/</a><o:p></o:p></p><p class=MsoNormal><o:p>&nbsp;</o:p></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'></body></html>
</body>
</html>

但是当我运行它时，行

df=pd.pandas.read\u html（path）

生成错误

ValueError:No tables found

这是否意味着read_html命令无法识别数据表？使用

read\u html

是整洁地解析此数据表的最明智的方法吗？我这么说是因为解析后的最后一步是将其全部导出到Oracle数据库

如果您能给我提供任何解决这个问题的建议，我将不胜感激。谢谢。

我认为您的错误在于read_html（）方法中“path”参数的引号。确保删除它们，否则将使用字符串“path”而不是包含实际路径的变量path调用它

path = r'Z:\\blub'

if os.path.isfile(path):
    df = pd.pandas.read_html(path)
    print (df)

首先，您可以从文件中读取数据，然后使用

from bs4 import BeautifulSoup
import pandas as pd
import lxml
import html5lib

path = 'file.html'
with open(path, 'rt') as myfile:
    data = myfile.read().replace("<br>", '\n')


df = pd.read_html(data)

由于这不是从html解析数据的可靠方法，我建议您使用BeautifulSoup解析和创建数据框架

from bs4 import BeautifulSoup
path = 'file.html'
ecj_data = open(path,'r').read()

soup = BeautifulSoup(ecj_data)


tabulka = soup.find("table", {"class" : "MsoNormalTable"})

column_headers = ['ID','Available Quota', 'Live Weight Pounds', 'Price', 'Date Posted']
records = []
for idy, row in enumerate(tabulka.findAll('tr')):
    if idy == 0:
        continue
    cols = row.findAll('td')
    record = {}
    for idx, col in enumerate(cols):
        record[column_headers[idx]] = col.text.strip()
    records.append(record)

df = pd.DataFrame.from_dict(records)

df[column_headers]

输出将如下所示：

路径是一个变量。您正在将其用作字符串

pd.pandas.read\u html（path）

删除引号会返回相同的错误：（您能检查我的答案吗？我希望这有帮助：）如果您需要更多帮助，请告诉我。删除引号会返回相同的错误，不幸的是，您应该将“r”放在字符串前面以转义\b特殊字符。然后，确保该文件存在。我试图阅读准确的html，并取得了成功。但是，正如@Vikash已经提到的，这不是非常可靠的方法，因为我只处理非常简单的html表……您的第二种方法实际上与我尝试的方法类似。您得到的输出看起来很完美……但是，当我尝试上述两种方法时，我总是遇到相同的错误：我收到

Errno 13权限被拒绝：'Z:\\blub'

。我以前见过这个错误，但它仍然使我困惑。我不确定我的代码有什么不同之处可以避免此错误，但导致此错误的是

open（）

行。我将尝试将您的代码与我的代码结合起来，看看我能做些什么，将html文件和python程序放在同一个文件中。我将它们都放在文件夹“Blub”中，但由于权限被拒绝，仍然失败。通过在os.listidr（路径）中对文件名使用

，\n file\u path=os.path.join（path，filename）\n如果os.path.isfile（file\u path）：\n并将open（file\u path，'r'）作为f:

成功地访问了该文件！我将您的代码与我的代码结合起来，成功地将所有数据放入一个数据帧中。但事情是这样的……我只想要最新日期的数据，在这种情况下，就是5/20的数据。现在它位于数据帧中，是否易于解析？我有100个这样的HTML数据表，所以理想情况下，我需要的代码足够强大，只捕获最近日期的相应数据。有什么想法吗？将日期列转换为日期数据类型并进行筛选。或者在使用beautiful soup浏览表格时，添加一个if条件并过滤掉不需要的行。

df[1]

from bs4 import BeautifulSoup
path = 'file.html'
ecj_data = open(path,'r').read()

soup = BeautifulSoup(ecj_data)


tabulka = soup.find("table", {"class" : "MsoNormalTable"})

column_headers = ['ID','Available Quota', 'Live Weight Pounds', 'Price', 'Date Posted']
records = []
for idy, row in enumerate(tabulka.findAll('tr')):
    if idy == 0:
        continue
    cols = row.findAll('td')
    record = {}
    for idx, col in enumerate(cols):
        record[column_headers[idx]] = col.text.strip()
    records.append(record)

df = pd.DataFrame.from_dict(records)

df[column_headers]