CODEWITHSUNDEEP
pythonpython-2.7
nutship
nutship

Reputation: 4924

TypeError: can only concatenate tuple (not "int") to tuple

urllist = ['http://example.com',
           'http://example1.com']
i = 0
while i < len(urllist):
    source = urllib.urlopen(urllist[i]).read()
    regex = '(\d{3})/">(\w+\s-\s\w+)</a>'  # e.g. '435', 'Tom-Jerry' 
    p = re.compile(regex)
    db = re.findall(p, source)
    db = [tuple(filter(None, t)) for t in db]   

    hero_id = []
    for i in db:
        hero_id.append(i[0])

    i += 1
print hero_id

db = [tuple(filter(None, t)) for t in db] db is a list of tuples like this: [('564', 'Tom', 'Jerry'), ('321', 'X-man', 'Hulk')]

The logic behind this should be the following: Start off with the urllist[0], search for the regex, collect the db, for every tuple in db, take the [0] element from the tuple (the number) and append it to the hero_id list. While you're done, add 1 to i and repeat the whole process for the next url from urllist while there is none left.

When I run this code, I get this:

i += 1 TypeError: can only concatenate tuple (not "int") to tuple

i += 1 in the code is outside the for loop so this exception surprises me a little bit. Ideas?

Upvotes: 0

Views: 4117

Answers (2)

Eric Urban
Eric Urban

Reputation: 3820

The for loop for i in db: is changing the value of i inside the while loop. Use a different (more descriptive) name in the for loop.

Upvotes: 2

Croad Langshan
Croad Langshan

Reputation: 2800

The "for i in db" loop assigns a tuple to i. The scope of i is the function (or module, if this is module-scope code).

The only loop syntax in Python 2 that has its own scope is the generator expression.

Upvotes: 2

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