[XML-SIG] what's this.

[???]

i use the xml.dom.minidom to parse a xml file.and get the content like this:but before every string there is a u.what's the u char.
thanks .

[2, u'accept', u'10.1.1.0', u'10.1.1.255', u'12:1E:EF:1D:6F:65', u'10.1.1.92', u'in', u'1', u'7', [u'1:30', u'3:30', u'6:30', u'8:30'], [u'2:30', u'4:30', u'7:30', u'9:30'], u'deny', u'10.1.1.0', u'10.1.1.255', u'12:1E:EF:1D:6F:65', u'10.1.1.92', u'in', u'1', u'7', [u'1:30', u'3:30', u'6:30', u'8:30'], [u'2:30', u'4:30', u'7:30', u'9:30']]