python - top down shooter zombie survival how to get the player to shoot? -

would please tell me how bullet class/variable working cause error "'bullet' object not callable".

heres bullet class

class bullet(pygame.sprite.sprite):     def __init__(self):         super().__init__()          self.image = pygame.surface([3,3])         self.image.fill(brown)         self.rect = self.image.get_rect()         self.rect.center = body.rect.center         self.tick = true         self.ticknum = 0         self.ticktarget = 10      def update(self):         if self.ticknum == self.ticktarget:             self.tick = true         else:             self.ticknum += 1          self.velx = mousex/20         self.vely = mousey/20          self.rect.x += self.velx         self.rect.y += self.vely 

heres bit calls , makes shoot

while true:     if buttondown:         bullet = bullet()          if bullet.tick == true:                         bullet_list.add(bullet)             all_sprites_list.add(bullet)             bullet.tick = false 

heres entire code:

import pygame, sys, time, math pygame.locals import *  pygame.init()  pygame.display.set_caption("###zombie survival###")  fps = 60  clock = pygame.time.clock()  dpwidth = 1500 dpheight = 800 middlex = int(dpwidth/2) middley = int(dpheight/2) middle = middlex,middley dp = pygame.display.set_mode((dpwidth,dpheight))  mousex = 0 mousey =  0 mouse = mousex,mousey buttondown = false  black = 0,0,0 white = 255,255,255 purple = 255,0,255 lightblue = 170,190,255 blue = 0,0,255 red = 255,0,0 brown = 85,65,0 green = 0,100,0  all_sprites_list = pygame.sprite.group() zombie_list = pygame.sprite.group() bullet_list = pygame.sprite.group() block_list = pygame.sprite.group() player_list = pygame.sprite.group()  load = pygame.image.load  class legs(pygame.sprite.sprite):     def __init__(self):         super().__init__()          self.image = load("player/player_legs_1.png")         self.rect = self.image.get_rect()         self.rect.center = middle         self.animate = false         self.timenum = 0         self.newimg = 1         self.timetarget = 8         self.rootimg = "player/player_legs_"      def update(self):         updateplayer(self)            class body(pygame.sprite.sprite):     def __init__(self):         super().__init__()          self.image = load("player/player_gun_1.png")         self.rect = self.image.get_rect()         self.rect.center = middle         self.animate = false         self.timenum = 0         self.newimg = 1         self.timetarget = 5         self.rootimg = "player/player_gun_"      def update(self):         updateplayer(self)  class bullet(pygame.sprite.sprite):     def __init__(self):         super().__init__()          self.image = pygame.surface([3,3])         self.image.fill(brown)         self.rect = self.image.get_rect()         self.rect.center = body.rect.center         self.tick = true         self.ticknum = 0         self.ticktarget = 10      def update(self):         if self.ticknum == self.ticktarget:             self.tick = true         else:             self.ticknum += 1          self.velx = mousex/20         self.vely = mousey/20          self.rect.x += self.velx         self.rect.y += self.vely  ##class zombie(pygame.sprite.sprite): ## ##class block(pygame.sprite.sprite):  def basic():     global mousex     global mousey     global mouse     global buttondown      event in pygame.event.get():         if event.type == mousemotion:             mousey = event.pos[1]             mousex = event.pos[0]             mouse = mousex,mousey         if event.type == mousebuttondown:             buttondown = true         elif event.type == mousebuttonup:             buttondown = false         elif event.type == quit:             pygame.quit()             exit      curser()  def curser():     pygame.draw.circle(dp,black,mouse,10,2)     pygame.draw.circle(dp,black,mouse,3)  def rotateplayer(class):       playerxdif = mousex-middlex     playerydif = mousey-middley     dif = (playerxdif),(playerydif)      rotdeg1 = math.atan2(dif[0],dif[1])     rotdeg2 = math.degrees(rotdeg1)      img1 = rotateimage(class.image,rotdeg2)      return img1  def rotateimage(img,angle):     orig_rect = img.get_rect()     rot_img = pygame.transform.rotate(img,angle)     rot_rect = orig_rect.copy()     rot_rect.center = rot_img.get_rect().center     rot_img = rot_img.subsurface(rot_rect).copy()      return rot_img  def updateplayer(class):         class.newtimetarget = int(fps/class.timetarget)          if class.animate == true:             class.timenum += 1              if class.timenum == self.newtimetarget:                 if class.newimg != self.maximg:                     class.newimg += 1                 else:                     class.newimg = 1                     class.animate = false                 class.timenum = 0         else:             class.newimg = 1          class.image = load(str(class.rootimg+str(class.newimg)+".png"))         class.image = rotateplayer(class)  legs = legs() body = body() player_list.add([body,legs]) all_sprites_list.add([body,legs])  while true:     if buttondown:         bullet = bullet()          if bullet.tick == true:                         bullet_list.add(bullet)             all_sprites_list.add(bullet)             bullet.tick = false      dp.fill(green)      basic()      all_sprites_list.update()     all_sprites_list.draw(dp)      clock.tick(fps)      #print(mouse)      pygame.display.update() 

bullet = bullet() problem. you're doing nasty things namespace. instead, bullet = bullet() or b = bullet()