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Python - Continuing after exception at the point of exception
from xml.dom import minidom
    dom = minidom.parse("algorithms.xml")
    ...
       parameter = dom.getElementsByTagName("Parameters")[0]
       # loop over parameters
       try:
            while True:
                parameter_id = parameter.getElementsByTagName("Parameter")[m].getAttribute("Id")
                parameter_name = parameter.getElementsByTagName("Name")[m].lastChild.data
                ...
                parameter_default = parameter.getElementsByTagName("Default")[m].lastChild.data
                print parameter_id
                print parameter_default
                m = m+1
        except IndexError:
            #reached end of available parameters
            pass
        #except AttributeError:
            #parameter doesn't exist
            #?

def getParam(p, tagName, index, post=None):
    post = post or lambda i: i
    try:
        return post(p.getElementsByTagName(tagname)[index])
    except AttributeError:
        print "informative message"
    return None # will happen anyway, but why not be explicit?

parameter_id = getParam(parameter, "Parameter", m, lambda x: x.getAttribute("Id"))
parameter_name = getParam(parameter, "Name", m, lambda x: x.lastChild.data)
...

try:
    while True:
        try:
            parameter_id = parameter.getElementsByTagName("Parameter")[m].getAttribute("Id")
            parameter_name = parameter.getElementsByTagName("Name")[m].lastChild.data
            ...
            parameter_default = parameter.getElementsByTagName("Default")[m].lastChild.data
            print parameter_id
            print parameter_default
            m = m+1
        except AttributeError:
            print "parameter doesn't exist"
        #?
except IndexError:
    #reached end of available parameters
    pass