(PyQt4) How to update a label with a random value from a list

Basically, I'm making a program that relies on random generation from lists. The first generation works fine but I want it so that when I press the "random" button, the field is automatically updated with another name. I'm new to PyQt (a few days) and Python in general so a little help would be appreciated :)

Code:

def random_hero(self):
      hero_dict = ["Adagio", "Alpha", "Ardan", "Baron", "Blackfeather", "Catherine", "Celeste", "Flicker", \
                                  "Fortress", "Glaive", "Gwen", "Idris", "Joule", "Kestrel", "Koshka", "Krul", "Lance", "Lyra", "Ozo", "Petal", \
                                  "Phinn", "Reim", "Ringo", "Rona", "Samuel", "Saw", "Skaarf", "Skye", "Taka", "Vox"]
      num = 1
      newRandomHero = random.sample(hero_dict,num)
      global randHeroName
      randHeroName = newRandomHero[0]
      print (randHeroName)
      heroName = randHeroName
 
def tab3UI(self):
      self.setGeometry(250, 100, 800, 300)
      layout = QGridLayout()
      hero_dict = ["Adagio", "Alpha", "Ardan", "Baron", "Blackfeather", "Catherine", "Celeste", "Flicker", \
                                  "Fortress", "Glaive", "Gwen", "Idris", "Joule", "Kestrel", "Koshka", "Krul", "Lance", "Lyra", "Ozo", "Petal", \
                                  "Phinn", "Reim", "Ringo", "Rona", "Samuel", "Saw", "Skaarf", "Skye", "Taka", "Vox"]
      num = 1
      randomHero = random.sample(hero_dict,num)
 
      layout.addWidget(QLabel("Hero:"),0,0)
      global heroName
      heroName = layout.addWidget(QLabel(randHeroName),0,1)
 
      self.btnRandomHero = QPushButton("Random")
      layout.addWidget(self.btnRandomHero,0,3)
      self.btnRandomHero.clicked.connect(self.random_hero)   
 
      blankSpaceLabel1 = layout.addWidget(QLabel(""),0,4,0,8)
      blankSpaceLabel1 = layout.addWidget(QLabel(""),1,0,0,8)
 
      self.setTabText(2,"Ultimate Bravery")
      self.tab3.setLayout(layout)