类型错误：'float' 对象没有属性 '__getitem__',python
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TypeError: 'float' object has no attribute '__getitem__',python
提问by Evanildo Rocha
How do I fix this?
我该如何解决？
Traceback (most recent call last):
File "l3.py", line 45, in <module>
z = solve_minmax(n, a, B, x_min=-1000, x_max=1000)
File "l3.py", line 33, in solve_minmax
dot_B_x = pulp.lpSum([B[i][j] * x[j] for j in range(n)])
TypeError: 'float' object has no attribute '__getitem__'
回答by AbdealiJK
The __getitem__is a special python function which is equivalent to the operator []or the indexing or the "get item" operator.
这__getitem__是一个特殊的 python 函数，相当于运算符[]或索引或“获取项目”运算符。
So, the error is basically saying that there is a variable which is a float. And to this variable you've called the __getitem__function - probably by doing an index operator to it.
所以，错误基本上是说有一个变量是浮点数。对于这个变量，你已经调用了__getitem__函数——可能是通过对它执行索引运算符。
Based on the traceback which shows the line dot_B_x = pulp.lpSum([B[i][j] * x[j] for j in range(n)])as the culprit, it seems either B, B[i], or x would be the probable issue
根据显示该行为dot_B_x = pulp.lpSum([B[i][j] * x[j] for j in range(n)])罪魁祸首的回溯，似乎 B、B[i] 或 x 可能是问题
回答by DeepSpace
pulp.lpSum([B[i][j] * x[j] for j in range(n)])
pulp.lpSum([B[i][j] * x[j] for j in range(n)])
TypeError: 'float' object has no attribute '__getitem__'
TypeError: 'float' object has no attribute '__getitem__'
Which means that either B, B[i]or xare floats, and you can't use []on these.
这意味着B,B[i]或x是浮点数，您不能[]在这些上使用。
