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I'm the villian/main_32.py

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+# all imports
+import math;
+import pygame;
+from pygame.locals import *
+
+# init
+pygame.init()
+
+# setting display
+surf=pygame.display.set_mode((400,400))
+pygame.display.set_caption("Wtf is this??")
+
+class obj(pygame.sprite.Sprite):
+    '''Can be inherited as a base class'''
+    #all_obj_derived=pygame.sprite.Group();
+    def __init__(self,x,y,sprite_filename,alpha=None):
+        ''' alpha may have values None(no alpha set),1(set_colorkey as the bottom-right corner),2(per-pixel alpha)'''
+        super().__init__();
+        self.x=x;
+        self.y=y;
+        self.xprevious=x;
+        self.yprevious=y; #ToDO : Make way for acceleration ("force" model) and setting speed
+        # set correct spr attribute
+        self.spr=pygame.image.load(sprite_filename).convert();
+
+        if alpha==None:
+            self.spr=self.spr.convert();
+        elif alpha==1:
+            self.spr=self.spr.convert();
+            self.spr.set_colorkey(self.spr.get_at((self.spr.get_width(),self.spr.get_height())));
+        elif alpha==2:
+            self.spr=self.spr.convert_alpha();
+
+        # as it is a derived class of Sprite, it can be directly added to gr group
+        #obj.all_obj_derived.add(super());
+
+
+    #obj.list.append(self);
+
+    def get_speed(self):
+        return int(math.sqrt(self.get_hspeed()**2+self.get_vspeed*()*2));
+
+    def get_hspeed(self):
+        return (self.x-self.xprevious);
+
+    def get_vspeed(self):
+        return (self.y-self.yprevious);
+
+    def draw_self(self):
+        surf.blit(self.sprite,(self.x-self.sprite.get_width()/2,self.y-self.sprite.get_height()/2));
+
+    def update(self):
+        ''' Should be called after draw_self (or as the last method) to update xprevious.
+            If not called, get_speed(),get_hspeed(),get_vspeed() won't work'''
+        self.xprevious=self.x;
+
+# creating new classes
+class a(obj):
+    all=pygame.sprite.Group();
+    def __init__(self,x,y,sprite_filename,alpha=None):
+        super().__init__(x,y,sprite_filename,alpha=None)
+        a.all.add(self);
+    wow=True;
+
+class b(obj):
+    wow=False;
+
+a1=a(0,0,"a.png")
+a2=b(0,0,"a.png")
+# game startup code
+c=pygame.time.Clock();
+
+# main game loop
+while True:
+    # event check
+    for event in pygame.event.get():
+        if event.type == QUIT:
+            exit();
+
+    c.tick();
+    pygame.display.set_caption(str(c.get_fps()));
+    pygame.display.update();
+
+    #Events here
+#--------------------------------------------------------- end---------------------------------------------------#