1. Background: python 3/win10
2. Error Line:
idx = nums.index[target-operand1]
3. Solution
index()是对list的函数，所以要用圆括号，而不是方括号
idx = nums.index(target-operand1)
[Trouble Shooting - Python] TypeError: 'builtin_function_or_method' object is not subscriptable
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