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IndexError：列表索引超出范围(IndexError: list index out of range)

 虽然绊倒了我的教程，但我有一个反复出现的问题（我说反复出现，因为它似乎在我放弃了一天之后自发地解决了，后来再次出现，我不知道我是什么这样做会导致错误：  
Traceback (most recent call last):
  File "roguelike.py", line 215, in <module>
    make_map()
  File "roguelike.py", line 131, in make_map
    create_room(new_room)
  File "roguelike.py", line 84, in create_room
    map[x][y].blocked = False
IndexError: list index out of range
 
 相关代码如下：  
def create_room(room):
    global map
    #set all tiles inside the room to passable
    for x in range(room.x1 + 1, room.x2):
        for y in range(room.y1 + 1, room.y2):
            map[x][y].blocked = False
            map[x][y].block_sight = False
 
 最后，我将我逐个字符编写的代码与教程中编写的示例代码进行比较，没有运气。 这是第一次在程序中使用'map'，而在python中的列表中我很丢失。  
 作为最后一点，我以相同的精神探讨了其他问题，但由于我的知识有限，我无法将它们应用于我的情况。 

While stumbling my way through a tutorial, I've had a recurring issue (I say recurring, because it seemed to spontaneously resolve itself after I'd given up for the day and later on begin appearing again, I don't know what I did to make that happen) with the error: 
Traceback (most recent call last):
  File "roguelike.py", line 215, in <module>
    make_map()
  File "roguelike.py", line 131, in make_map
    create_room(new_room)
  File "roguelike.py", line 84, in create_room
    map[x][y].blocked = False
IndexError: list index out of range
 
Relevant code below: 
def create_room(room):
    global map
    #set all tiles inside the room to passable
    for x in range(room.x1 + 1, room.x2):
        for y in range(room.y1 + 1, room.y2):
            map[x][y].blocked = False
            map[x][y].block_sight = False
 
It ended up at the point where I was comparing the code I had written character-by-character to the example code written in the tutorial, with no luck. This is the first time 'map' is used in the program, and I'm pretty lost when it comes to lists in python. 
As a final note, I've poked about through other questions in the same spirit, but I couldn't apply them to my situation due to my limited knowledge.

原文：https://stackoverflow.com/questions/28795986

更新时间：2022-03-31 11:03

最满意答案

 在我的CLR对象为Nullable的情况下，当我使用VB.NET时，我使用了这个扩展方法：  
    Private Function GetNullable(Of T As Structure)(ByVal row As System.Data.DataRow, ByVal fieldname As String, ByVal convert As Conversion(Of T)) As Nullable(Of T)
        Dim nullable As Nullable(Of T)
        If System.Convert.IsDBNull(row(fieldname)) Then
            nullable = Nothing
        Else
            nullable = convert(row, fieldname)
        End If
        Return nullable
    End Function
 
 使用以下Conversion(Of T)代表Conversion(Of T) ：  
Private Delegate Function Conversion(Of T)(ByVal row As System.Data.DataRow, ByVal fieldname As String) As T
 
 然后我在相关数据类型的扩展上进行分层：  
    <Extension()> _
    Public Function GetDouble(ByVal row As System.Data.DataRow, ByVal name As String) As Double
        Return Convert.ToDouble(row(name))
    End Function

    <Extension()> _
    Public Function GetNullableDouble(ByVal row As System.Data.DataRow, ByVal name As String) As System.Nullable(Of Double)
        Return GetNullable(Of Double)(row, name, AddressOf GetDouble)
    End Function
 
 最后，我可以使用：  
Dim amount As Double? = dr.GetNullableDouble("amount")

In cases where my CLR object is Nullable, back when I was using VB.NET I used this extension method: 
    Private Function GetNullable(Of T As Structure)(ByVal row As System.Data.DataRow, ByVal fieldname As String, ByVal convert As Conversion(Of T)) As Nullable(Of T)
        Dim nullable As Nullable(Of T)
        If System.Convert.IsDBNull(row(fieldname)) Then
            nullable = Nothing
        Else
            nullable = convert(row, fieldname)
        End If
        Return nullable
    End Function
 
With the following delegate for Conversion(Of T): 
Private Delegate Function Conversion(Of T)(ByVal row As System.Data.DataRow, ByVal fieldname As String) As T
 
I then layer on extensions for relevant datatypes: 
    <Extension()> _
    Public Function GetDouble(ByVal row As System.Data.DataRow, ByVal name As String) As Double
        Return Convert.ToDouble(row(name))
    End Function

    <Extension()> _
    Public Function GetNullableDouble(ByVal row As System.Data.DataRow, ByVal name As String) As System.Nullable(Of Double)
        Return GetNullable(Of Double)(row, name, AddressOf GetDouble)
    End Function
 
Finally, I can use: 
Dim amount As Double? = dr.GetNullableDouble("amount")

IndexError：列表索引超出范围(IndexError: list index out of range)

最满意答案

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