Python assign text to new variable

Question

In Python, I am using BeautifulSoup to parse text. I want to save a set of 'str' objects into a list. The following code won't run, but the idea should come across:

listings = soup.find_all('h6')
for i in listings:
    projecturls[i] = i.find_all('a', href=True)[0]['href']

So I want to cycle through the elements 'listings' and extract a string. I then want to save this string into projecturls, which I want to be a list. But I get the following error:

NameError: name 'projecturls' is not defined

How do I define this? Or is there a better way to do what I want?

I suppose that dynamically defining N variables would also work, but it is not preferred.

It looks like 'projecturls' is a dictionary. Add projecturls={} right above that loop to inittialize this loop. — dawg
– dawg, Commented May 24, 2014 at 3:13

falsetru · Accepted Answer · 2014-05-24 03:13:37Z

2

Define projecturls as a list object, then use list.append method to add an item there:

listings = soup.find_all('h6')
projecturls = [] # <-------------
for i in listings:
    url = i.find_all('a', href=True)[0]['href']
    projecturls.append(url) # <------

answered May 24, 2014 at 3:13

falsetru

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awesoon · Accepted Answer · 2014-05-24 03:22:06Z

2

You could also use list comprehension:

listings = soup.find_all('h6')
projecturls = [i.find_all('a', href=True)[0]['href'] for i in listings]

Or map function:

listings = soup.find_all('h6')
projecturls = list(map(lambda i: i.find_all('a', href=True)[0]['href'], listings))

answered May 24, 2014 at 3:22

awesoon

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