how to use pyquery to modify a node attribute in python

iwant use pyquery to do this.

for example:

html='<div>arya stark<img src="1111"/>ahahah<img src="2222"/></div>'
a=PyQuery(html)

i want to modify the html to

<div>arya stark<img src="aaaa"/>ahahah<img src="bbbb"/></div>

in other words, just nee开发者_JAVA技巧d change img element's src attribute, and get the modified html.

any ideas?or any other method?

thanks

---

Since PyQuery is meant you mirror jQuery, perhaps this question would be relevant. Long story short, use the attr() method:

>>> html='<div>arya stark<img src="1111"/>ahahah<img src="2222"/></div>'
>>> a=PyQuery(html)
>>> a.outerHtml()
'<div>arya stark<img src="1111">ahahah<img src="2222"></div>'
>>> for img in a('img'):
...     PyQuery(img).attr('src', "whatever")
...
[<img>]
[<img>]
>>> a.outerHtml()
'<div>arya stark<img src="whatever">ahahah<img src="whatever"></div>'

---

Something like this:

import pyquery

html = '<div>arya stark<img src="1111"/>ahahah<img src="2222"/></div>'
tree = pyquery.PyQuery(html)
tree('img:first').attr('src', 'cccc')
print str(tree)

<div>arya stark<img src="cccc"/>ahahah<img src="2222"/></div>

To apply a function to a selection you can use .each(), but note that bare elements are passed to the function:

>>> from __future__ import print_function
>>> tree('img').each(lambda i, n: print(n.attrib))
{'src': 'cccc'}
{'src': '2222'}