如何使用Python在表单中选择选项？

Question

我想知道如何在格式为的表单中选择选项

  <td align="left">
                  <select name="FORM1" id="FORM1" multiple="multiple" size="5">
                      <option value="Value1">Value1</option>
                      <option value="Value2">Value2</option>
                  </select>
  </td>

现在,我正在使用mechanize连接到网站并遍历到所需的页面.此页面有多种形式,如FORM1,FORM2,FORM3等,带有选项.我想选择(启用)Value1然后告诉mechanize实例点击提交按钮.哪个是基于表单名称启用选项的快速方法？

Answer 1

以下是一些基本的用法示例,可帮助您:

>>> import mechanize
>>> br = mechanize.Browser()
>>> br.open('http://www.w3schools.com/html/html_forms.asp')

表格有一个name属性; 虽然有时它是空的:

>>> [f.name for f in br.forms()]
['searchform', None, None, None, None, 'input0']

表格有一系列控制; 控件也有名称:

>>> forms = [f for f in br.forms()]
>>> forms[1].controls[0].name
'firstname'
>>> [c.name for c in forms[3].controls]
['sex']

您可以在控件中获取项目列表:

>>> forms[3].controls[0].get_items()
[<Item name='male' id=None type='radio' name='sex' value='male'>, <Item name='female' id=None type='radio' name='sex' value='female'>]

对于单选按钮,您必须进行单个选择:

>>> forms[3]['sex'] = ['male']

但选择必须在列表中:

>>> forms[3]['sex'] = 'male'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Python/2.6/site-packages/mechanize/_form.py", line 2782, in __setitem__
    control.value = value
  File "/Library/Python/2.6/site-packages/mechanize/_form.py", line 1977, in __setattr__
    self._set_value(value)
  File "/Library/Python/2.6/site-packages/mechanize/_form.py", line 1985, in _set_value
    raise TypeError("ListControl, must set a sequence")
TypeError: ListControl, must set a sequence

对于复选框,您可以进行多项选择:

>>> [(c.name, c.get_items()) for c in forms[4].controls]
[('vehicle', [<Item name='Bike' id=None type='checkbox' name='vehicle' value='Bike'>, <Item name='Car' id=None type='checkbox' name='vehicle' value='Car'>])]
>>> forms[4]['vehicle'] = ['Bike', 'Car']

你可以在这里找到更多信息(链接从Matt Hempel :) 被盗.