CODEWITHSUNDEEP
pythonpython-3.x
M3ME5
M3ME5

Reputation: 57

TypeError: 'NoneType' object is not iterable when using zip_longest

I am developing a python script to analyse a txt file and then save it to a osv file. I am trying to use "zip_longest" from the module "itertools". When one of my dictionaries no longer has i value i want it to paste a empty space while the other dictionary continues to paste its values. My code looks like this:

def csvExport(self):
        exportYN = input("Would you like to export the document to a CSV file? (Y/N):")
        if (exportYN == "Y" or exportYN == "y"):
            with open('data.csv', 'w', encoding="utf-8") as csvfile:
                csvfile.write("Username;Repeated;Password;Repeated")
                for (username, usrValue), (password, passValue) in itertools.zip_longest(self.usernames.items(), self.passwords.items()):
                    csvfile.write(str(username) + ";" + str(usrValue) + ";" + str(password) + ";" + str(passValue))

And the error code looks like this:

for (username, usrValue), (password, passValue) in itertools.zip_longest(self.usernames.items(), self.passwords.items()):
TypeError: 'NoneType' object is not iterable

I think it is related to zip_longest because the two dictionaries i use is not the same length.

Hope you can help :)

Upvotes: 2

Views: 904

Answers (1)

Jacques Gaudin
Jacques Gaudin

Reputation: 16988

You need to use the fillvalue keyword argument of zip_longest:

ziplongest(..., ..., fillvalue=('', ''))

Otherwise the default is None and None cannot fill a 2-tuple for example (username, usrValue).

Aside from that, since dictionaries are not ordered the zip operation will return random pairs...

Upvotes: 2

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