Understanding " 'xml.etree.ElementTree.Element' does not support the buffer interface"
Saran Ahluwalia
ahlusar.ahluwalia at gmail.com
Sun Jan 10 12:53:28 EST 2016
Hi Steven:
The previous code was a stand along under the " if __name__ == '__main__':
". The full function suite that I have made (and indeed includes a try and
except block):
import os.path
import sys
import csv
from io import StringIO
import xml.etree.cElementTree as ElementTree
from xml.etree.ElementTree import XMLParser
# import xml
# import xml.sax
# from xml.sax import ContentHandler
def flatten_list(self, aList, prefix=''):
for i, element in enumerate(aList, 1):
eprefix = "{}{}".format(prefix, i)
if element:
# treat like dict
if len(element) == 1 or element[0].tag != element[1].tag:
yield from flatten_dict(element, eprefix)
# treat like list
elif element[0].tag == element[1].tag:
yield from flatten_list(element, eprefix)
elif element.text:
text = element.text.strip()
if text:
yield eprefix[:].rstrip('.'), element.text
def flatten_dict(parent_element, prefix=''):
prefix = prefix + parent_element.tag
if parent_element.items():
for k, v in parent_element.items():
yield prefix + k, v
for element in parent_element:
eprefix = element.tag
if element:
# treat like dict - we assume that if the first two tags
# in a series are different, then they are all different.
if len(element) == 1 or element[0].tag != element[1].tag:
yield from flatten_dict(element, prefix=prefix)
# treat like list - we assume that if the first two tags
# in a series are the same, then the rest are the same.
else:
# here, we put the list in dictionary; the key is the
# tag name the list elements all share in common, and
# the value is the list itself
yield from flatten_list(element, prefix=eprefix)
# if the tag has attributes, add those to the dict
if element.items():
for k, v in element.items():
yield eprefix+k
# this assumes that if you've got an attribute in a tag,
# you won't be having any text. This may or may not be a
# good idea -- time will tell. It works for the way we are
# currently doing XML configuration files...
elif element.items():
for k, v in element.items():
yield eprefix+k
# finally, if there are no child tags and no attributes, extract
# the text
else:
yield eprefix, element.text
def just_xml_data(path):
with open(path, 'rU', encoding='UTF-8') as data:
separated = data.read().split('","')
print(separated)
try:
x = ElementTree.XML(separated[3])
print(x)
xml.etree.ElementTree.dump(x)
y = ElementTree.XML(separated[4])
xml.etree.ElementTree.dump(y)
# response = ElementTree.XML(separated[4]) # work on the
Response column
# root = ElementTree.XML(response) #serialize and parse into
XML object
except Exception as e:
print(e)
else:
xml_field = dict(flatten_dict(y))
return xml_field
def read_data(path):
headers= set()
rows = []
with open(path, 'rU', encoding='utf-8') as data:
reader = csv.DictReader(data, dialect=csv.excel,
skipinitialspace=True)
for row in reader:
xml_field = row["CLIENT_RESP_DATA"]
# xml_data = just_xml_data(xml_field) ## function
if xml_data is not None:
row.update(xml_data)
headers.update(row.keys())
rows.append(row)
else:
print("Failure")
pass
with open(os.path.splitext(textFile)[0] + '_' + 'parsed' + '.csv',
"wt", newline='') as output_file:
wr = csv.writer(output_file)
csv_headers = list(headers)
wr.writerow(csv_headers)
for row in rows:
values = []
for field in csv_headers:
value = row.get(field, None)
values.append(value)
wr.writerow(values)
return output_file
if __name__ == '__main__':
Response = "s.csv"
just_xml_data(Response)
Hopefully this will provide you with enough information to emulate
(apologies for any and all indentation errors during the copy and paste).
FYI - I still receive the same error.
On Sun, Jan 10, 2016 at 12:27 PM, Steven D'Aprano <steve at pearwood.info>
wrote:
> On Mon, 11 Jan 2016 02:04 am, kbtyo wrote:
>
> > Hello Everyone:
> >
> > I am curious to know why I receive the aforementioned message. I am using
> > Python 3.4.3 and Windows 7. I am running the following script from
> Windows
> > Powershell:
>
> I created a file "data" containing the input data you said:
>
> > The input data is as follows:
> >
> > A,B,C,D,E,F,G,H,I,J
> > "3","8","1","<Request TransactionID="3" RequestType="FOO"><InstitutionISO
> > /><CallID>23</CallID><MemberID>12</MemberID><MemberPassword
> >
> /><RequestData><AccountNumber>2</AccountNumber><AccountSuffix>85</AccountSuffix><AccountType>S</AccountType><MPIAcctType>Checking</MPIAcctType><TransactionCount>10</TransactionCount></RequestData></Request>","<Response
> > TransactionID="2"
> >
>
> RequestType="HoldInquiry"><PulledLoans>True</PulledLoans><PulledClosedLoans>False</PulledClosedLoans><PulledInvestments>False</PulledInvestments><PulledClosedInvestments>False</PulledClosedInvestments><PulledCards>False</PulledCards><ShareList>0000',0001,0070,</ShareList></Response>","1967-12-25
> > 22:18:13.471000","2005-12-25 22:18:13.768000","2","70","0"
>
>
>
> and then a script containing the code you said you used:
>
> > import xml.etree.cElementTree as ElementTree
> > from xml.etree.ElementTree import XMLParser
>
> > Response = 's.csv'
> > with open(Response, 'rU', encoding='utf-8') as data:
> > separated = data.read().split('","')
> > x = ElementTree.XML(separated[3])
> > y = ElementTree.XML(separated[4])
> > print(dict(flatten_dict(x)))
> > print(dict(flatten_dict(y)))
>
>
> I get a completely different error to you, complete with traceback as
> expected:
>
> Traceback (most recent call last):
> File "/tmp/testxml.py", line 9, in <module>
> print(dict(flatten_dict(x)))
> NameError: name 'flatten_dict' is not defined
>
>
> This shows me three things:
>
> (1) The calls to ElementTree.XML work fine, and don't raise an exception;
>
> (2) There is no error message referring to xml.etree.ElementTree.Element or
> the buffer interface;
>
> (3) The code you posted is clearly not the code you actually ran. At the
> very least, it is not *all* the code you ran.
>
> We cannot tell what it wrong with your code if you don't show us the code
> that fails. I suggest you read this webpage:
>
> http://www.sscce.org/
>
> and follow the advice given. It's written for Java, but applies to any
> programming language. Hopefully you will either solve your problem, or be
> able to generate a sufficiently small piece of code that we can work with.
>
>
> You also suggest that your code works when running in a Jupyter Notebook.
> It
> is unlikely (but not impossible!) that exactly the same code will run
> differently when run as a script and when run under Jupyter. More likely,
> there is some difference between the code, something you have written in
> the Notebook but not included in the script.
>
> If it is exactly the same code, then perhaps it is a difference in the two
> environments. Does Jupyter set up the environment differently to what you
> get when running a script?
>
> Finally, in another post, you state:
>
> "That is the only message (*xml.etree.ElementTree.Element' does not support
> the buffer interface"*). There is no traceback."
>
>
> That is very unlikely with the code sample you posted. If true, that gives
> more evidence that you are running code which is different from what you
> have posted here. Perhaps your ACTUAL code (not the pretend code you showed
> us) includes a try...except block like this:
>
> try:
> some code goes here
> except Exception as err:
> print(err)
> sys.exit()
>
>
> or similar. If so, TAKE IT OUT. That is destroying useful debugging
> information and making it more difficult to solve your problem.
>
>
>
>
>
> --
> Steven
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>
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