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Technically a working minecraft with watef physics, but it often crashes :/ someone pls help me

from ion import *
from kandinsky import *
from time import sleep
from random import randint
world=[]
world2=[]
alrmoved=[]
blocks=[["Blank",color(255,255,255)],["Dirt",color(100,50,50)],["Water",color(100,200,255)],["Grass",color(50,150,50)],["TNT",color(255,50,50)],["Stone",color(100,100,100)],["Wood",color(200,80,100)],["Seed",color(0,255,0)],["Fire",color(255,100,0)],["Lava",color(255,50,0)]]
data=[[-79,-80,-81,-38,-39,-40,-41,-42,-2,-1,0,1,2,38,39,40,41,42,79,80,81],[0,-40,-80],[-118,-119,-120,-121,-122,-158,-159,-160,-161,-162,-199,-200,-201],[-39,-40,-41,-1,1,39,40,41]]
def replace(pos,item):
  world2=[]
  world.insert(pos,item)
  for i in range(len(world)-pos-2):
    world2.append(world[len(world)-1])
    world.pop()
  world.pop()
  for i in range(len(world2)):
    world.append(world2[len(world2)-1-i])
  draw_string(str(len(world))+" "+str(len(world2))+" "+str(len(alrmoved)),200,50)

def init(a):
  for i in range(920):
    if a==0:world.append(0)
    else:
      if i<40:world.append(0)
      elif world[i-40]==3 and randint(1,10)==1:
        replace(i-80,7)
        world.append(1)
      elif world[i-40]==5 or (world[i-40]==1 and randint(1,3)==1):world.append(5)
      elif world[i-40]==3 or world[i-40]==1:world.append(1)
      elif i>randint(479,719):world.append(3)
      else:world.append(0)
      fill_rect(i%40*8,int(i/40)*8,8,8,blocks[world[i]][1])

def moveblock(i,a):
  j=i+a
  fill_rect(j%40*8,int(j/40)*8,8,8,blocks[world[i]][1])
  replace(j,world[i])
  replace(i,0)
  fill_rect(i%40*8,int(i/40)*8,8,8,color(255,255,255))
  alrmoved.append(j)

a=input("Write 1 for a generated terrain\n")
init(int(a))

x=0
y=0
selected=1
fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
tick=0
sleep(0.5)
while True:
  draw_string(str(len(world))+" "+str(len(world2))+" "+str(len(alrmoved)),50,50)
  alrmoved=[]
  for i in range(920):
    if world[i]==7:
      for j in range(3):
        replace(i+data[1][j],6)
        fill_rect((i+data[1][j])%40*8,int((i+data[1][j])/40)*8,8,8,color(200,80,100))
      for j in range(13):
        replace(i+data[2][j],3)
        fill_rect((i+data[2][j])%40*8,int((i+data[2][j])/40)*8,8,8,color(50,150,50))
    if world[i]==4:
      for j in range(21):
        replace(i+data[0][j],0)
        fill_rect((i+data[0][j])%40*8,int((i+data[0][j])/40)*8,8,8,color(255,255,255))
    if world[i]==8 and not i in alrmoved:
      for j in range(8):
        if world[i+data[3][j]]==3 or world[i+data[3][j]]==6:
          replace(i+data[3][j],8)
          fill_rect((i+data[3][j])%40*8,int((i+data[3][j])/40)*8,8,8,color(255,100,0))
      if randint(1,5)==1:
        replace(i,0)
        fill_rect(i%40*8,int(i/40)*8,8,8,color(255,255,255))
      elif world[i-40]==0 and world[i-39]==0 and world[i-41]==0:
        a=randint(1,3)
        if a==1:moveblock(i,-39)
        elif a==2:moveblock(i,-41)
        else:moveblock(i,-40)
      elif world[i-40]==0:
        moveblock(i,-40)
      elif world[i-39]==0:
        moveblock(i,-39)
      elif world[i-41]==0:
        moveblock(i,-41)
    if i+40<920:
      if (world[i]==2 or world[i]==9) and not i in alrmoved:
        if world[i+40]==0:
          moveblock(i,40)
        elif world[i+39]==0 and world[i+41]==0:
          if randint(1,2)==1:moveblock(i,39)
          else:moveblock(i,41)
        elif world[i+39]==0:
          moveblock(i,39)
        elif world[i+41]==0:
          moveblock(i,41)
        elif world[i-1]==0 and world[i+1]==0:
          if randint(1,2)==1:moveblock(i,-1)
          else:moveblock(i,1)
        elif world[i-1]==0:
          moveblock(i,-1)
        elif world[i+1]==0:
          moveblock(i,1)
  fill_rect(0,184,320,38,color(150,150,150))
  draw_string("Selected block: "+blocks[selected][0],100,200,color(255,255,255),color(150,150,150))
  tick+=1
  draw_string("Tick: "+str(tick),0,200,color(255,255,255),color(150,150,150))
  fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
  if keydown(KEY_FOUR)and selected>0:
    selected-=1
    sleep(0.1)
  elif keydown(KEY_SIX)and selected<len(blocks)-1:
    selected+=1
    sleep(0.1)
  if keydown(KEY_LEFT)and x>0:
    fill_rect(x*8,y*8,8,8,blocks[world[(y*40)+x]][1])
    x-=1
    fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
    sleep(0.05)
  elif keydown(KEY_RIGHT)and x<39:
    fill_rect(x*8,y*8,8,8,blocks[world[(y*40)+x]][1])
    x+=1
    fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
    sleep(0.05)
  if keydown(KEY_UP)and y>0:
    fill_rect(x*8,y*8,8,8,blocks[world[(y*40)+x]][1])
    y-=1
    fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
    sleep(0.05)
  elif keydown(KEY_DOWN)and y<22:
    fill_rect(x*8,y*8,8,8,blocks[world[(y*40)+x]][1])
    y+=1
    fill_rect(x*8+3,y*8+3,2,2,color(255,0,0))
    sleep(0.05)
  if keydown(KEY_OK):
    world2=[]
    for i in range(920):
      if i==(y*40)+x:
        world2.append(selected)
      else:
        world2.append(world[i])
    fill_rect(x*8,y*8,8,8,blocks[selected][1])
    world=world2