Question

我对python很新，我在2.7.6上遇到问题3.4.4上没有问题

代码：

def answer(population, x, y, strength):

# make sure Z is infectable
if population[x][y] > strength:
    return population
else:
    population[x][y] = -1

# get array dimentions
rows = len(population)
cols = len(population[0])

# declare checking array
toCheck = []
toCheck.append([x,y])

# loop 4 way check
while(1):
    #store and pop current element
    i = toCheck[0][0]
    j = toCheck[0][1]
    toCheck.pop(0)

    # left
    if j != 0:
        if population[i][j-1] <= strength and population[i][j-1] != -1:
            population[i][j-1] = -1
            toCheck.append([i,j-1])

    # top
    if i != 0:
        if population[i-1][j] < strength and population[i-1][j] != -1:
            population[i-1][j] = -1
            toCheck.append([i-1,j])

    # right 
    if j != cols-1:
        if population[i][j+1] > strength and population[i][j+1] != -1:
            population[i][j+1] = -1
            toCheck.append([i,j+1])

    # bottom
    if i != rows-1:
        if population[i+1][j] > strength and population[i+1][j] != -1:
            population[i+1][j] = -1
            toCheck.append([i+1][j])

    if len(toCheck) == 0:
        return population

给我一个'TypeError'。虽然代码：

def answer(population, x, y, strength):

# make sure Z is infectable
if population[x][y] > strength:
    return population
else:
    population[x][y] = -1

# get array dimentions
rows = len(population)
cols = len(population[0])

# declare checking array
toCheck = [[]]
toCheck.append([x,y])

# loop 4 way check
while(1):
    #store and pop current element
    i = toCheck[0][0]
    j = toCheck[0][1]
    toCheck.pop(0)

    # left
    if j != 0:
        if population[i][j-1] <= strength and population[i][j-1] != -1:
            population[i][j-1] = -1
            toCheck.append([i,j-1])

    # top
    if i != 0:
        if population[i-1][j] < strength and population[i-1][j] != -1:
            population[i-1][j] = -1
            toCheck.append([i-1,j])

    # right 
    if j != cols-1:
        if population[i][j+1] > strength and population[i][j+1] != -1:
            population[i][j+1] = -1
            toCheck.append([i,j+1])

    # bottom
    if i != rows-1:
        if population[i+1][j] > strength and population[i+1][j] != -1:
            population[i+1][j] = -1
            toCheck.append([i+1][j])

    if len(toCheck) == 0:
        return population

给我和'IndexError'。这两个错误都发生在第i = toCheck [0] [0]行。请帮忙！谢谢。

Answer 1

编辑：此回复是针对旧版本的问题代码。

假设您的所有代码都应该在funk（）中：

一旦toCheck为空，您需要终止while循环。在弹出所有值后，原始版本会尝试索引空列表。试试这个：

# loop 4 way check
while len(toCheck) > 0:
    #store and pop current element
    i = toCheck[0][0]
    j = toCheck[0][1]
    toCheck.pop(0)

此外，在添加值之前，您无需声明toCheck。你可以替换

toCheck = [[],[]]
toCheck.append([x,y])

用

toCheck = [x, y]

python：类型错误和索引错误（2.7.6）

1 个答案: