Python 切片索引必须是整数或 None 或具有 __index__ 方法
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Slice indices must be integers or None or have __index__ method
提问by DescampsAu
I'm trying something with Python. I want to slice a list (plateau) in several list (L[i]) but I have the following error message:
我正在用 Python 尝试一些东西。我想在多个列表 (L[i]) 中切片一个列表（高原），但出现以下错误消息：
File "C:\Users\adescamp\Skycraper\skycraper.py", line 20, in <module>
item = plateau[debut:fin]
TypeError: slice indices must be integers or None or have an __index__ method
The concerned line is the one with item = plateau[debut:fin]
相关线路是 item = plateau[debut:fin]
from math import sqrt
plateau = [2, 3, 1, 4, 1, 4, 2, 3, 4, 1, 3, 2, 3, 2, 4, 1]
taille = sqrt(len(plateau))
# Division en lignes
L = []
i = 1
while i < taille:
fin = i * taille
debut = fin - taille
item = plateau[debut:fin]
L.append(item)
i += 1
采纳答案by Martijn Pieters
Your debutand finvalues are floating point values, not integers, because tailleis a float.
您的debut和fin值是浮点值，而不是整数，因为taille是浮点数。
Make those values integers instead:
将这些值改为整数：
item = plateau[int(debut):int(fin)]
Alternatively, make taillean integer:
或者，创建taille一个整数：
taille = int(sqrt(len(plateau)))
