XML in Python and lxml
Question
I am using the pinnacle (betting) api which returns an XML file. At the moment, I save it to a .xml file as below:
req = urllib2.Request(url, headers=headers)
responseData = urllib2.urlopen(req).read()
ofn = 'pinnacle_feed_basketball.xml'
with open(ofn, 'w') as ofile:
ofile.write(responseData)
parse_xml()
and then open it in the parse_xml function
tree = etree.parse("pinnacle_feed_basketball.xml")
fdtime = tree.xpath('//rsp/fd/fdTime/text()')
I am presuming saving it as an XML file and then reading in the file is not necessary but I cannot get it to work without doing this.
I tried passing in responseData to the parsexml() function
parse_xml(responseData)
and then in the function
tree = etree.parse(responseData)
fdtime = tree.xpath('//rsp/fd/fdTime/text()')
But it doesn't work.
2 answers
solution1
1 2015-03-16 22:47:58
parse() is designed to read from file-like objects .
But you are passing a string in both cases - pinnacle_feed_basketball.xml string and responseData , which is also a string.
In the first case it should be:
with open("pinnacle_feed_basketball.xml") as f:
tree = etree.parse(f)
In the second case:
root = etree.fromstring(responseData) # note that you are not getting an "ElementTree" object here
FYI, urllib2.urlopen(req) is also a file-like object :
tree = etree.parse(urllib2.urlopen(req))
solution2
1 ACCPTED 2015-03-16 22:48:37
If you want to parse an in-memory object (in your case, a string), use etree.fromstring(<obj>) -- etree.parse expects a file-like object or filename -- Docs
For example:
import urllib2, lxml.etree as etree
url = 'http://www.xmlfiles.com/examples/note.xml'
headers = {}
req = urllib2.Request(url, headers=headers)
responseData = urllib2.urlopen(req).read()
element = etree.fromstring(responseData)
print(element)
print(etree.tostring(element, pretty_print=True))
Output:
<Element note at 0x2c29dc8>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>
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