Python函数返回None

Question

I have the following piece of code:

def retornaReplicas(verify_key):
    connection = sqlite3.connect('servidor.db')
    cursor = connection.cursor()

    sql = 'SELECT replicas FROM arquivos_sad WHERE verify_key="%s"' % (verify_key)
    cursor.execute(sql)
    resultado = cursor.fetchone()

    return '@'.join(resultado)

I am debugging this code on Python interactive terminal and if I do:

print retornaReplicas(verify_key)

It returns 'None'. But if I type the commands manually (instead of a function) like this:

connection = sqlite3.connect('servidor.db')
cursor = connection.cursor()

sql = 'SELECT replicas FROM arquivos_sad WHERE verify_key="%s"' % (verify_key)
cursor.execute(sql)
resultado = cursor.fetchone()
print '@'.join(resultado)

it works. Python doesn't give any errors too. Why this return instatement isn't working?

BTW, verify_key is a UUID that I set up manually for debugging purposes (and it's a known value) and this code is using sqlite3 databases to make a consult.

Answer 1

Sorry, now it worked. I think that something that I imported before made some strange bug or something. After exiting the old shell and opening another one it worked.

Btw, I just don't post the whole code because it's a bloody mess. I really don't like it, but this is not originally my code and I don't really have the time to rewrite it (this is my project to graduate on Computer Science).