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Ah, well. Don't know whether it meets your aesthetic standards, but:
>>> my_list = ['tree', 'hug', 'flower', 'hug', 'bear', 'run']
>>> my_list[0:len(a):2]
['tree', 'flower', 'bear']
>>> my_list[1:len(a):2]
['hug', 'hug', 'run']
and hence
>>> zip(my_list[0:len(a):2], my_list[1:len(a):2])
[('tree', 'hug'), ('flower', 'hug'), ('bear', 'run')]
and furthermore
>>> for a, b in zip(my_list[0:len(a):2], my_list[1:len(a):2]):
... print a, b
...
tree hug
flower hug
bear run
or the slightly less obfuscated:
>>> for index in range(0, len(my_list), 2):
... print my_list[index], my_list[index + 1]
...
tree hug
flower hug
bear run
On Sep 11, 2008, at 5:19 PM, [EMAIL PROTECTED] wrote:
On Sep 11, 4:04 pm, Manuel Ebert <[EMAIL PROTECTED]> wrote:
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Hi Andy,
by the looks of it I'd say that the problem is that the second
parameter you passed to start_element is not a dictionary at all (the
clue is in the "AttributeError: 'LIST' object" ...).
>>> d = ['tree', 'house']
>>> start_element("Thing", d)
Thing :
AttributeError: 'list' object has no attribute 'items'
>>> d = {'tree': 'hug', 'flower' : 'eat'}
>>> start_element("Thing", d)
Thing : flower="eat" tree="hug"
Manuel
On Sep 11, 2008, at 4:21 PM, [EMAIL PROTECTED] wrote:
Hi
I'm new to Python and trying to pick up good, idiomatic usage right
from the offset.
As I was familiar with Expat from C++ (directly and via expatpp) I'm
trying to write a little script - using xml.parsers.expat - to
search
and replace XML attribute values.
As I want the attributes to stay in order when the file is
written out
(so I can check my results with a diff tool) I've set the parser's
ordered_attributes attribute. But this has stopped the for loop
working with the tuplets.
The relevant bit of code in my little test, using the default
Dictionary for the attributes, is:
def start_element(name, attrs):
print "%s : " % name,
for (a,b) in attrs.items():
print " %s=\"%s\"" % (a,b),
But when I set ordered_attributes, first it doesn't like the items()
AttributeError: 'list' object has no attribute 'items'
And then it doesn't like the tuple
ValueError: too many values to unpack
Do I have keep track of where I am (name, value, name, value, ...)
Or is there a way I can solve the problem with a tuple?
Thanks, Andy
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Sorry!
I forgot to mention that when you set the parser's ordered_attributes
attribute, it sends the "attrs" to start_element as a list, not a
dictionary, in the order name, value, name, value, ...
Andy
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