AttributeError: 'Namespace' object has no attribute

Question

I am writing a program that uses urllib2 to download CSV data from an http site. The program works fine when run within Python, however I am also trying to use argparse to be able to enter the url from the command line.

I get the following error when I run it:

File "urlcsv.py", line 51, in downloadData
    return urllib2.urlopen(url)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 396, in open
    protocol = req.get_type()
AttributeError: 'Namespace' object has no attribute 'get_type'

I guess this is part of the urllib2 library because it is not code that I have written. Has anybody else encountered similar problems with either the argparse or urllib2 modules?

The relevant part of the code is as follows:

parser = argparse.ArgumentParser()
parser.add_argument("url")


def main():
    """Runs when the program is opened"""

    args = parser.parse_args()
    if args is False:
        SystemExit
    try:
        csvData = downloadData(args)
    except urllib2.URLError:
        print 'Please try a different URL'
        raise
    else:
        LOG_FILENAME = 'errors.log'
        logging.basicConfig(filename=LOG_FILENAME,
                            level=logging.DEBUG,
                            )
        logging.getLogger('assignment2')
        personData = processData(csvData)
        ID = int(raw_input("Enter a user ID: "))
        if ID <= 0:
            raise Exception('Program exited, value <= 0')
        else:
            displayPerson(ID)
            main()

def downloadData(url):

    return urllib2.urlopen(url)

The stack trace is of course indicating a problem in the urllib2 module, from the paths being given. — nbro
– nbro, Commented Feb 10, 2015 at 2:06
Show us the code you have written, and the input you are giving. — user764357
– user764357, Commented Feb 10, 2015 at 2:24
The code you've posted doesn't include the line with the error. What do you have req set to? — user559633
– user559633, Commented Feb 11, 2015 at 22:08
@tristan the line protocol = req.get_type() is part of the urllib2 module in the Python standard library; it is not code that I have written, it is code that is called by urllib2.urlopen(url) — Sam CD
– Sam CD, Commented Feb 11, 2015 at 22:11
But you haven't included the line in your example of where you set protocol=req.get_type(), which means you still need to "post the code," so to speak. I don't know where you're expecting req to exist, because there's not a member method urllib2.req. — user559633
– user559633, Commented Feb 11, 2015 at 22:16

davidism · Accepted Answer · 2015-02-12 02:33:17Z

27

You're parsing command line arguments into args, which is a Namespace with attributes set to the parsed arguments. But you're passing this entire namespace to downloadData, rather than just the url. This namespace is then passed to urlopen, which doesn't know what to do with it. Instead, call downloadData(args.url).

answered Feb 12, 2015 at 2:33

davidism

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Comments

Andrii Abramov · Accepted Answer · 2019-03-20 10:41:02Z

13

Long story short.

Arguments in object returned from parser.parse_args() should be accessed via properties rather than via [] syntax.

Wrong

args = parser.parse_args()
args['method']

Correct

args = parser.parse_args()
args.method

answered Mar 20, 2019 at 10:41

Andrii Abramov

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2 Comments

gye Over a year ago

What if the arg name contains special character? For example instead of "method", I use "<method>". But then "args.<method>" will be obviously invalid.

Michael Francis Over a year ago

@gye don't use special characters in your argument names?

jjjshade · Accepted Answer · 2019-04-08 23:36:07Z

1

I had this problem due to a whitespace before the option sting.

answered Apr 8, 2019 at 23:36

jjjshade

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Comments

user2138149 · Accepted Answer · 2024-02-11 19:48:51Z

1

May be helpful for others in future.

If you are using metavar or dest make sure you understand what these arguments are for.

In short:

meta_var is something to do with the help message which is printed
dest is the name of the attribute which will be set (name of attribute which is created to store your command line argument when parsed)

answered Feb 11, 2024 at 19:48

user2138149

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