When I append a Unicode string to the end of str, I can not click on the URL.

Bad:

base_url = 'https://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&format=xml&titles='url = base_url + u"Ángel_Garasa"
print url

Good:

base_url = 'https://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&format=xml&titles='url = base_url + u"Toby_Maquire"
print url

It appears that you're printing the results in an IDE, perhaps PyCharm. You need to percent encode a UTF-8 encoded version of the string:

import urllibbase_url = 'https://en.wikipedia.org/w/api.php?action=query&prop=revisions&rvprop=content&format=xml&titles='
name = u"Ángel_Garasa"print base_url + urllib.quote(name.encode("utf-8"))

This shows:

In your case you need to update your code, so that the relevant field from the database is percent encoded. You only need to encode this one field to UTF-8 just for the percent encoding.