矩阵生成器python索引分配列表超出范围

下面是我写的代码。它说列表分配索引超出范围。我似乎不知道我哪里出了问题。也许有人可以详细说明错误在哪里

def genarator(x, y):
    square = x * y
    matrix = [[]]
    matrix2 = []

    i = 0    
    while square > 0:
        j = 0
        while x > j:
            matrix[i][j] = int(raw_input("Enter the matrix number"))
            j = 1
        i = 1
        square = -square
        matrix2 = matrix2 + matrix

    return matrix2


def main():    
    matrix3 = []
    x = int(raw_input("Enter the width of your matrix"))
    y = int(raw_input("Enter the Length of your matrix"))
    matrix3 = genarator(x, y)
    print(matrix3)
    return 0

main()

###编辑我解决了这个问题 def发生器（x，y）：

---

main（）

如果您尝试以下代码段：

x = []
x[0] = 4

您将看到有一个错误。原因是

x[0]

尚未定义，因此无法修改。要修复错误，您必须在修改列表之前将某些内容附加到列表中：

def genarator(x, y):
    square = x * y
    matrix = [[]]
    matrix2 = []

    i = 0    
    while square > 0:
        matrix.append([])
        j = 0
        while x > j:
            matrix[-1].append(int(raw_input("Enter the matrix number")))
            j = 1
        i = 1
        square = -square
        matrix2 = matrix2 + matrix

    return matrix2

我还修改了索引，因为

-1

将为您提供最后一项，这是您想要的

x = []
x[0] = 4

def genarator(x, y):
    square = x * y
    matrix = [[]]
    matrix2 = []

    i = 0    
    while square > 0:
        matrix.append([])
        j = 0
        while x > j:
            matrix[-1].append(int(raw_input("Enter the matrix number")))
            j = 1
        i = 1
        square = -square
        matrix2 = matrix2 + matrix

    return matrix2