棋盘上的怪物追逐游戏：如果用户在第一次执行时输入1，为什么X不会出现？

Question

Essentially this game allows user to choose a space on a 25 space board. There's a monster that randomly chooses a space (work in progress with the user's 'scent').

If you start the program and enter 1 as your first move it doesn't appear on the board. Does anyone know why this may be?

Bonus questions:

• I'd like for the 'scent' to disappear after one turn..any ideas? or
• I'd like user to get points for amount of scent left on before dyeing. Any ideas?

import random

choice = 0
move = 0
user = "  X  "
monster = "<{:}>"
scent = "  i  "
space = "     "
rabbit = True

mapp = [space for i in range (25)]
print(mapp)


def print_mapp():
    row_1 = "|{}|{}|{}|{}|{}|".format(mapp[0],mapp[1],mapp[2],mapp[3],mapp[4])
    row_2 = "|{}|{}|{}|{}|{}|".format(mapp[5],mapp[6],mapp[7],mapp[8],mapp[9])
    row_3 = "|{}|{}|{}|{}|{}|".format(mapp[10],mapp[11],mapp[12],mapp[13],mapp[14])
    row_4 = "|{}|{}|{}|{}|{}|".format(mapp[15],mapp[16],mapp[17],mapp[18],mapp[19])
    row_5 = "|{}|{}|{}|{}|{}|".format(mapp[20],mapp[21],mapp[22],mapp[23],mapp[24])

    print()
    print(row_1)
    print(row_2)
    print(row_3)
    print(row_4)
    print(row_5)
    print()

print_mapp()

def user_move():
    global choice
    if user in mapp:
        mapp[choice] = scent
    choice = (int(input("Where would you like to move? (1-25): "))-1)
    check()
    mapp[choice] = user

def monster_move():
    global move
    mapp[move] = space
    move = (random.randint(1,25))-1
    check()
    mapp[move] = monster

def check():
    if  (mapp[choice] == monster) or (mapp[move] == user):
        print("Die sucka\n"*20)
        global rabbit
        rabbit = False
    else:
        pass



while rabbit == True:
    user_move()
    monster_move()
    print_mapp()


print("You died a horrible death.")  

Answer 1

The problem is in monster_move , specifically the line:

mapp[move] = space

You initialize move = 0 at the beginning, so it always erases the first square, and since it happens after the user has moved, the user won't show up there.

Instead, you could set it to a different value for the first round and check against that:

move = -1

and in monster_move :

if move > -1:
    mapp[move] = space

Bonus questions:

I'd like for the 'scent' to disappear after one turn..any ideas?

Keep track of previous positions and use that to remove the scent. If you use a queue data structure (in Python, this can be done with a list ), it is easy to extend to "fancier" algorithms like keeping track for more than one turn.

At the top, initialize

prev_moves = []

And in user_move , remove the old scent and add the new:

def user_move():
    global choice
    if user in mapp:
        mapp[choice] = scent # replace the user marker
        if len(prev_moves) > 0:
            mapp[prev_moves.pop(0)] = space # remove earliest move
        prev_moves.append(choice) # add most recent move
        print(prev_moves)
    for move in prev_moves: # place scent markers
        mapp[move] = scent
    choice = (int(input("Where would you like to move? (1-25): "))-1)
    check()
    mapp[choice] = user

If you wanted scent to last longer, just check how long the list is and only pop if it's greater than what you want.

I'd like user to get points for amount of scent left on before dyeing. Any ideas?

With the list implementation above, you can just check len(prev_moves) .