TypeError: 'NoneType' object is not iterable using python

Question

I am working on xml file of 210mb size using python. The data contain Nonetype and it give error as "TypeError: 'NoneType' object is not iterable"

import xml.etree.ElementTree as etree
nsmap = {}
lis = []
for event, elem in etree.iterparse("data_1.xml", events=('start-ns', 'end-ns'), remove_blank_text=True):
    try:
        print event, elem
        ns, url = elem
    #filter(None, lis)
    except ValueError:
        nsmap[ns] = url
print nsmap


TypeError                                 Traceback (most recent call last)
<ipython-input-23-23b2c0b682e8> in <module>()
      4     try:
      5         print event, elem
----> 6         ns, url = elem
      7     #filter(None, lis)
      8     except ValueError:

TypeError: 'NoneType' object is not iterable

Don't how to solve it. I just want to print the data. Even without using try and except method it show same error.

picnix_ · Accepted Answer · 2018-05-01 07:02:46Z

3

The exception you catch is of TypeError and not ValueError. If you want to catch the exception, replace ValueError by TypeError or leave it blank (you will henceforth catch all exceptions). Note that you should not try to use ns or url in the except block since they are undefined.

The other solution to do is:

if elem is not None:
    ns, url = elem
    nsmap[ns] = url

answered May 1, 2018 at 7:02

picnix_

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2 Comments

Adam Smith Over a year ago

or use a tuple except (ValueError, TypeError) as e: ...

picnix_ Over a year ago

Yes indeed. However, I don't see how it may raise a ValueError actually (perhaps I am missing a trivial case).

user9614249 · Accepted Answer · 2018-05-01 06:34:52Z

1

Add a check for None

if elem is None:
    continue

Or do whatever you want to handle elem being None inside of the block

answered May 1, 2018 at 6:34

user9614249

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