snake and ladder game using python

#snake and ladder game
end=100
import random
def  check_ladder(points):
  
  if points==8:
    print("ladder")
    return 26
  elif points==21:
    print("ladder")
    return 82
  elif points==43:
    print("ladder")
    return 77
  elif points==50:
    print("ladder")
    return 91
  elif points==54:
    print("ladder")
    return 93
  elif points==62:
    print("ladder")
    return 96
  elif points==66:
    print("ladder")
    return 87
  elif points==80:
    print("ladder")
    return 100
  else:
    #not a ladder
    return points
def check_snake(points):
  if points==44:
    print("snake")
    return 22
  elif points==46:
    print("snake")
    return 5
  elif points==48:
    print("snake")
    return 9
  elif points==52:
    print("snake")
    return 11
  elif points==55:
    print("snake")
    return 7 
  elif points==59:
    print("snake")
    return 17
  elif points==64:
    print("snake")
    return 36
  elif points==69:
    print("snake")
    return 33
  elif points==73:
    print("snake")
    return 1
  elif points==83:
    print("snake")
    return 19
  elif points==92:
    print("snake")
    return 51
  elif points==95:
    print("snake")
    return 24
  elif points==98:
    print("snake")
    return 28
  else:
    #not a snake
    return points
def reached_end(points):
  if points ==end:
    return True
  else:
    return False 
def play():
  # input player 1 name 
  p1_name=input("player 1,please enter your name:")
  # input player 2 name 
  p2_name=input("player 2,please enter your name:")
  #initial points of player 1
  pp1=0
  #initial points of player 2
  pp2=0
  turn=0
  while(1):
    if turn%2==0:
      #player 1 turn
      print(p1_name,"your turn")
      #ask player's choice to continue
      c=int(input("press 1 to continue, 0 to quit:"))
      if c==0:
        print(p1_name,"scored",pp1)
        print(p2_name,"scored",pp2)
        print("quitting the game !thanks for playing")
        break
      else:

        #generate a random number from 1,2,3,4,5,6
        dice=random.randint(1,6)
        print("Dice showed:",dice)
        #add points
        pp1=pp1+dice
        pp1=check_ladder(pp1)
        pp1=check_snake(pp1)
        #check if the player goes beyond the board
        if pp1>end:
          pp1=end
        print(p1_name,"your score:",pp1)
        if reached_end(pp1):
          print(p1_name,"won")
          break
    else:
      #player 2 turn
      print(p2_name,"your turn")
      #ask player's choice to continue
      c=int(input("press 1 to continue, 0 to quit:"))
      if c==0:
        print(p1_name,"scored",pp1)
        print(p2_name,"scored",pp2)
        print("quitting the game !thanks for playing")
        break
      else:
  
        #generate a random number from 1,2,3,4,5,6
        dice=random.randint(1,6)
        print("Dice showed:",dice)
        #add points
        pp2=pp2+dice
        pp2=check_ladder(pp2)
        pp2=check_snake(pp2)
        #check if the player goes beyond the board
        if pp2>end:
          pp2=end
        print(p2_name,"your score:",pp2)
        if reached_end(pp2):
          print(p2_name,"won")

          break
    turn=turn+1
play()