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    <p>The <code>u</code> means those are Unicode strings. They can be encoded to any character set you want:</p> <pre><code>u'http://www.someURL.com'.encode('ascii') # or 'latin-1' or 'utf-8' </code></pre> <p>You'll get back the same string without the <code>u</code> because they're all ASCII characters.</p> <p>See <a href="http://docs.python.org/howto/unicode.html" rel="nofollow">http://docs.python.org/howto/unicode.html</a>.</p> <p>If the strings only contain ASCII characters (all the normal symbols on an English keyboard) then you don't have to worry too much about this. If, however, you're using an extended character set, you need to make sure you're specifying the right encoding when saving strings or displaying them to the user.</p> <p>Edit: When I execute</p> <pre><code>import sqlite3 con = sqlite3.connect(":memory:") con.isolation_level = None c = con.cursor() val1, val2 = 'a', 'b' c.execute('CREATE TABLE IF NOT EXISTS reg(col1 TEXT PRIMARY KEY, col2 TEXT)') c.execute('INSERT INTO reg VALUES(?,?)', (val1, val2)) try: c.execute('INSERT INTO reg VALUES(?,?)', (val1, val2)) except sqlite3.IntegrityError: print val1, "is already in the database" </code></pre> <p>I get <code>a is already in the database</code>. (Note the proper way to do that print statement, although yours is perfectly valid.) So your problem is somewhere else -- <code>locked</code> means something else is writing to the database. Try this with an in memory database as I did, so you know for sure nothing else is accessing it. If this works, your problem is what the exception indicates -- something else is accessing the database.</p>
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    1. COHi, Thanks! Also you have mentioned `Note the proper way to do that print statement, although yours is perfectly valid.` So I am just wondering what is the best way? Did you mean using + in print statement is not the correct way? Instead use **,** ? I would like to hear what you have to say. Thanks!
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    2. COWhen you use `+` with strings, you're creating a new string. This involves making copies of the old strings. When you're using `print`, there is no reason to do that. `print` will automatically format things as strings and will insert a space wherever there is a comma (and a newline at the end of the line unless you end the line with a comma). If `val1` was an int, `print val1, string` would work, while `print val1 + string` wouldn't, you'd have to `print str(val1) + string`.
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