The __getitem__ is a special python function which is equivalent to the operator [] or the indexing or the “get item” operator.
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.
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
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