All the previous files

I'm the villian/class_definition(permanent).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??")
+
+#custom image-loading function
+def load_image(self,sprite_filename=None,alpha=None):
+    '''Load correct image with convert calls'''
+    if sprite_filename!=None:
+        self.spr=pygame.image.load(sprite_filename);
+        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()-1,self.spr.get_height()-1)));
+        elif alpha==2:
+            self.spr=self.spr.convert_alpha();
+
+        self.image=self.spr;#spr and image point to the same surface, to be checked
+    else:
+        self.image=self.spr=None;
+
+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=None,alpha=None):
+        ''' alpha may have values None(no alpha set),1(set_colorkey as the bottom-right corner),2(per-pixel alpha)'''
+        super(obj,self).__init__();
+        self.x=x;
+        self.y=y;
+        self.xprevious=x;
+        self.yprevious=y; #ToDO : Make way for acceleration ("force" model) and setting speed
+        self.hspeed=0;
+        self.vspeed=0;
+        global load_image;
+        load_image(self,sprite_filename,alpha);
+        # as it is a derived class of Sprite, it can be directly added to gr group
+        #obj.all_obj_derived.add(self);
+
+
+    #obj.list.append(self);
+
+    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;
+        self.yprevious=self.y;
+        self.x+=self.hspeed;
+        self.y+=self.vspeed;
+        self.speed=int(math.sqrt(self.hspeed**2+self.vspeed**2));
+        self.rect=self.image.get_rect(center=(self.x,self.y));
+
+#custom-made functions
+def update_inside(group_name):
+    '''e.g. group_name=a.all_instances.
+    Calls group_name.update only when sprite.image is within screen, else delete it.'''
+    temp=None;
+    for temp in group_name.sprites():
+        if (temp.x-temp.image.get_width()/2<surf.get_width()):
+            temp.update();
+        else:
+            group_name.remove(temp);
+
+# creating new classes
+class player(obj):
+    all_instances=pygame.sprite.RenderUpdates();
+    def __init__(self,x,y,sprite_filename,alpha=None):
+        super().__init__(x,y,sprite_filename,alpha)
+        player.all_instances.add(self);
+
+
+a1=player(surf.get_width()/2,surf.get_height()/2,"a.png",alpha=1)
+a1.vspeed=.1;
+a2=player(100,100,"a.png",alpha=1)