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lxml - SubElement dump root doesn't dump like Element dump does

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  lxml - SubElement dump root doesn't dump like Element dump does Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-19 20:51 -0700
    Re: lxml - SubElement dump root doesn't dump like Element dump does Peter Otten <__peter__@web.de> - 2016-06-20 08:19 +0200
      Re: lxml - SubElement dump root doesn't dump like Element dump does Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-20 00:13 -0700
      Re: lxml - SubElement dump root doesn't dump like Element dump does Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-20 01:21 -0700

#110168 — lxml - SubElement dump root doesn't dump like Element dump does

Afternoon

Wondering has anyone much experience with lxml specifically objectify?

When I pick up a file with lxml and use objectify dumping root works as expected actually better its quite nice. This is how i do it, file handling part left out for brevity.

def getsMeet(file_list):
    for filename in sorted(file_list):
        filename=my_dir + filename
        yield filename

def parseXML():
    """
    """
    for file in getsMeet(file_list):
        with open(file) as f:
            xml = f.read()

            root = objectify.fromstring(xml)
            print(root.tag)
            print(objectify.dump(root))
            race = objectify.SubElement(root,"race")
            print(objectify.dump(race))


parseXML()

So the first call to print(objectify.dump(root)) gives as a sample.

meeting = None [ObjectifiedElement]
  * id = '42977'
  * barriertrial = '0'
  * venue = 'Rosehill Gardens'
  * date = '2016-05-21T00:00:00'
  * gearchanges = '-1'
  * stewardsreport = '-1'
  * gearlist = '-1'
  * racebook = '0'
  * postracestewards = '0'
  * meetingtype = 'TAB'
  * rail = 'Timing - Electronic : Rail - +6m'
  * weather = 'Fine      '
  * trackcondition = 'Good 3    '
  * nomsdeadline = '2016-05-16T11:00:00'
  * weightsdeadline = '2016-05-17T16:00:00'
  * acceptdeadline = '2016-05-18T09:00:00'
  * jockeydeadline = '2016-05-18T12:00:00'
    club = '' [StringElement]
      * abbrevname = 'Australian Turf Club'
      * code = '56398'
      * associationclass = '1'
      * website = 'http://'
    race = None [ObjectifiedElement]
      * id = '215411'
      * number = '1'
      * nomnumber = '9'

Then I am confused when I want to repeat this but only for the subelement race I get a return but not as expected.

This is my return
race = '' [StringElement]

so why do i not get all the elements of race as I do when i dump the root?

Cheers

Sayth
PS I am referring to this documentation http://lxml.de/objectify.html#element-access-through-object-attributes

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#110178

Sayth Renshaw wrote:

> Afternoon
> 
> Wondering has anyone much experience with lxml specifically objectify?
> 
> When I pick up a file with lxml and use objectify dumping root works as
> expected actually better its quite nice. This is how i do it, file
> handling part left out for brevity.
> 
> def getsMeet(file_list):
>     for filename in sorted(file_list):
>         filename=my_dir + filename
>         yield filename
> 
> def parseXML():
>     """
>     """
>     for file in getsMeet(file_list):
>         with open(file) as f:
>             xml = f.read()
> 
>             root = objectify.fromstring(xml)
>             print(root.tag)
>             print(objectify.dump(root))
>             race = objectify.SubElement(root,"race")
>             print(objectify.dump(race))
> 
> 
> parseXML()
> 
> So the first call to print(objectify.dump(root)) gives as a sample.
> 
> meeting = None [ObjectifiedElement]
>   * id = '42977'
>   * barriertrial = '0'
>   * venue = 'Rosehill Gardens'
>   * date = '2016-05-21T00:00:00'
>   * gearchanges = '-1'
>   * stewardsreport = '-1'
>   * gearlist = '-1'
>   * racebook = '0'
>   * postracestewards = '0'
>   * meetingtype = 'TAB'
>   * rail = 'Timing - Electronic : Rail - +6m'
>   * weather = 'Fine      '
>   * trackcondition = 'Good 3    '
>   * nomsdeadline = '2016-05-16T11:00:00'
>   * weightsdeadline = '2016-05-17T16:00:00'
>   * acceptdeadline = '2016-05-18T09:00:00'
>   * jockeydeadline = '2016-05-18T12:00:00'
>     club = '' [StringElement]
>       * abbrevname = 'Australian Turf Club'
>       * code = '56398'
>       * associationclass = '1'
>       * website = 'http://'
>     race = None [ObjectifiedElement]
>       * id = '215411'
>       * number = '1'
>       * nomnumber = '9'
> 
> Then I am confused when I want to repeat this but only for the subelement
> race I get a return but not as expected.
> 
> This is my return
> race = '' [StringElement]
> 
> so why do i not get all the elements of race as I do when i dump the root?

Because race is a new SubElement that you just created:

>>> help(lxml.objectify.SubElement)
Help on built-in function SubElement in module lxml.etree:

SubElement(...)
    SubElement(_parent, _tag, attrib=None, nsmap=None, **_extra)
    
    Subelement factory.  This function creates an element instance, and
    appends it to an existing element.

>>>

Existing subelements can be accessed as attributes. I'd say that's the very 
point of the lxml.objectify library ;)

For example:

>>> root = 
lxml.objectify.fromstring("<a><b><c>one</c><d>two</d></b><b>second 
b</b></a>")
>>> print(lxml.objectify.dump(root.b))
b = None [ObjectifiedElement]
    c = 'one' [StringElement]
    d = 'two' [StringElement]
>>> print(lxml.objectify.dump(root.b[0]))
b = None [ObjectifiedElement]
    c = 'one' [StringElement]
    d = 'two' [StringElement]
>>> print(lxml.objectify.dump(root.b[1]))
b = 'second b' [StringElement]

> Cheers
> 
> Sayth
> PS I am referring to this documentation
> http://lxml.de/objectify.html#element-access-through-object-attributes

Read that again.

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#110180

Thanks your way makes more sense indeed. 

In the example they create and access I think I just got lost in their example. 

Sayth

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#110186

On Monday, 20 June 2016 16:19:31 UTC+10, Peter Otten  wrote:
> Sayth Renshaw wrote:
> 
> > Afternoon
> > 
> > Wondering has anyone much experience with lxml specifically objectify?
> > 
> > When I pick up a file with lxml and use objectify dumping root works as
> > expected actually better its quite nice. This is how i do it, file
> > handling part left out for brevity.
> > 
> > def getsMeet(file_list):
> >     for filename in sorted(file_list):
> >         filename=my_dir + filename
> >         yield filename
> > 
> > def parseXML():
> >     """
> >     """
> >     for file in getsMeet(file_list):
> >         with open(file) as f:
> >             xml = f.read()
> > 
> >             root = objectify.fromstring(xml)
> >             print(root.tag)
> >             print(objectify.dump(root))
> >             race = objectify.SubElement(root,"race")
> >             print(objectify.dump(race))
> > 
> > 
> > parseXML()
> > 
> > So the first call to print(objectify.dump(root)) gives as a sample.
> > 
> > meeting = None [ObjectifiedElement]
> >   * id = '42977'
> >   * barriertrial = '0'
> >   * venue = 'Rosehill Gardens'
> >   * date = '2016-05-21T00:00:00'
> >   * gearchanges = '-1'
> >   * stewardsreport = '-1'
> >   * gearlist = '-1'
> >   * racebook = '0'
> >   * postracestewards = '0'
> >   * meetingtype = 'TAB'
> >   * rail = 'Timing - Electronic : Rail - +6m'
> >   * weather = 'Fine      '
> >   * trackcondition = 'Good 3    '
> >   * nomsdeadline = '2016-05-16T11:00:00'
> >   * weightsdeadline = '2016-05-17T16:00:00'
> >   * acceptdeadline = '2016-05-18T09:00:00'
> >   * jockeydeadline = '2016-05-18T12:00:00'
> >     club = '' [StringElement]
> >       * abbrevname = 'Australian Turf Club'
> >       * code = '56398'
> >       * associationclass = '1'
> >       * website = 'http://'
> >     race = None [ObjectifiedElement]
> >       * id = '215411'
> >       * number = '1'
> >       * nomnumber = '9'
> > 
> > Then I am confused when I want to repeat this but only for the subelement
> > race I get a return but not as expected.
> > 
> > This is my return
> > race = '' [StringElement]
> > 
> > so why do i not get all the elements of race as I do when i dump the root?
> 
> Because race is a new SubElement that you just created:
> 
> >>> help(lxml.objectify.SubElement)
> Help on built-in function SubElement in module lxml.etree:
> 
> SubElement(...)
>     SubElement(_parent, _tag, attrib=None, nsmap=None, **_extra)
>     
>     Subelement factory.  This function creates an element instance, and
>     appends it to an existing element.
> 
> >>>
> 
> Existing subelements can be accessed as attributes. I'd say that's the very 
> point of the lxml.objectify library ;)
> 
> For example:
> 
> >>> root = 
> lxml.objectify.fromstring("<a><b><c>one</c><d>two</d></b><b>second 
> b</b></a>")
> >>> print(lxml.objectify.dump(root.b))
> b = None [ObjectifiedElement]
>     c = 'one' [StringElement]
>     d = 'two' [StringElement]
> >>> print(lxml.objectify.dump(root.b[0]))
> b = None [ObjectifiedElement]
>     c = 'one' [StringElement]
>     d = 'two' [StringElement]
> >>> print(lxml.objectify.dump(root.b[1]))
> b = 'second b' [StringElement]
> 

this actually seems quite powerful, I don't fully understand it yet though it seems I have just got an XML doc as a list of dicts so I can just slice and select as normal python.

thanks for helping

Sayth

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