For example, I want to download this page after inserting username and password:
http://forum.ubuntu-it.org/
I have tryed with wget but doe
Like @robert says, use mechanize.
To get you started:
from mechanize import Browser
b = Browser()
b.open("http://forum.ubuntu-it.org/index.php")
b.select_form(nr=0)
b["user"] = "johnconnor"
b["passwrd"] = "hellohello"
b.submit()
response = b.response().read()
if "Salve johnconnor" in response:
print "Logged in!"