関連ワード:  python get the index of a value in a list    python get the index of a value in an array    python get the index of a value    python list find the index of a value    python return index of a value in list    python find the index of a value in a string    python find the index of a value in a numpy array    python find the index of a value in a dataframe    python get index of value in dictionary    python get index of value in dict