parseando xml/xhtml
BeautifulSoup vamos ver como funciona:
licença, download, documentação, créditos etc... http://www.crummy.com/software/BeautifulSoup/
parseando xhtml
seja o arquivo teste_parser.html
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>teste do parser</title>
</head>
<body>
<table id="table1">
<tr><td>linha1 celula1</td><td>linha1 celula2</td></tr>
<tr><td>linha2 celula1</td><td>linha2 celula2</td></tr>
<tr><td>linha3 celula1</td><td>linha3 celula2</td></tr>
</table>
<form action="f1" method="post">
<input type="text" name="texto1" size="10" maxlength="10" value=""/>
<input type="text" name="texto2" size="10" maxlength="10" value=""/>
<input type="text" name="texto3" size="10" maxlength="10" value=""/>
<select name="sel1" size="2">
<option value="1" label="1"></option>
<option value="2" label="2"></option>
<option value="3" label="3"></option>
</select>
</form>
</body>
</html>no idle
Python 2.4.1 (#2, May 5 2005, 11:32:06)
[GCC 3.3.5 (Debian 1:3.3.5-12)] on linux2
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IDLE 1.1.1
>>> from BeautifulSoup import BeautifulSoup
>>> arq=file('teste_parser.html')
>>> tree=BeautifulSoup(arq.read())
>>> tree('title')
[<title>teste do parser</title>]
>>> tree('title')[0]
<title>teste do parser</title>
>>> tree('title')[0].string
'teste do parser'
>>> len(tree('table')[0]('td'))
6
>>> it=len(tree('table')[0]('td'))
>>> it
6
>>> for i in range(it):
print tree('table')[0]('td')[i].string
linha1 celula1
linha1 celula2
linha2 celula1
linha2 celula2
linha3 celula1
linha3 celula2
>>> #explorando atributos
>>> tree('table')[0]['id']
'table1'
>>> #explorando um <form>
>>> for i in range(len(tree('form'))):
print tree('form')[i]
<form action="f1" method="post">
<input type="text" name="texto1" size="10" maxlength="10" value="" />
<input type="text" name="texto2" size="10" maxlength="10" value="" />
<input type="text" name="texto3" size="10" maxlength="10" value="" />
<select name="sel1" size="2">
<option value="1" label="1"></option>
<option value="2" label="2"></option>
<option value="3" label="3"></option>
</select>
</form>
>>>
>>> for i in range(len(tree('form'))):
for j in range(len(tree('form')[i]('select'))):
for k in range(len(tree('form')[i]('select')[j]('option'))):
print tree('form')[i]('select')[j]('option')[k]['value']
1
2
3
>>>#é claro que cabe uma 'refatoração' na loucura acima
>>>#alterando um atributo
>>> tree('form')[0]['method']
'post'
>>> tree('form')[0]['method']='get'
>>> tree('form')[0]['method']
'get'
>>>#inserindo um atributo
>>> tree('form')[0]['enctype']='multipart/form-data'
>>> print tree('form')[0]
<form action="f1" method="get" enctype="multipart/form-data">
<input type="text" name="texto1" size="10" maxlength="10" value="" />
<input type="text" name="texto2" size="10" maxlength="10" value="" />
<input type="text" name="texto3" size="10" maxlength="10" value="" />
<select name="sel1" size="2">
<option value="1" label="1"></option>
<option value="2" label="2"></option>
<option value="3" label="3"></option>
</select>
</form>
>>>#potência!!!! como diz o Bidú (meu cunhado)
>>>
>>>#Luiz Antonio de Campos
>>>#no módulo BeautifulSoup existem outras 3 subclasses - verifique na URL acima
>>>#tente também com xhtml malformado (tipo <td>xxxxxxxxxx</td<td>xxxx</td>) ele vai acertar se
>>>#a malformação não for muito 'porca'
