我有一個列表，想要將 index(-1) 的值與整個列表的當前值索引相加list = [-2, -2, -1, 1, -1, 1, 3, 5, 6, -2, -1, 0, -2, -1, -2, 2]預期輸出：new_list =[-2,-4,-3, 0, 0, 0, 4, 8, 11, 4, -3, -1, -2, -3, -3, 0]new_list[0] = 0+ list[0] = 0+ (-2) = -2new_list[1] = list[0] + list[1] = (-2) + (-2) = -4new_list[2] = list[1] + list[2] = (-2)+ (-1) = -3new_list[3] = list[2] + list[3] = (-1)+ (1) = 0Basically new_list[index] = list[index -1] + list[index]
3 回答
紅顏莎娜
TA貢獻1842條經驗 獲得超13個贊
如果我正確理解您的要求，您可以使用pandas. 例如：
import pandas as pd
# Create a pandas Series of values
s = pd.Series([-2, -2, -1, 1, -1, 1, 3, 5, 6, -2, -1, 0, -2, -1, -2, 2])
# Add the current value in the series to the 'shifted' (previous) value.
output = s.add(s.shift(1), fill_value=0).tolist()
# Display the output.
print(output)
輸出：
[-2.0, -4.0, -3.0, 0.0, 0.0, 0.0, 4.0, 8.0, 11.0, 4.0, -3.0, -1.0, -2.0, -3.0, -3.0, 0.0]
慕俠2389804
TA貢獻1719條經驗 獲得超6個贊
list1 = [-2, -2, -1, 1, -1, 1, 3, 5, 6, -2, -1, 0, -2, -1, -2, 2]
new_list=[list1[0]]
for i in range(len(list1)-1):
value=list1[i]+list1[i+1]
new_list.append(value)
print(new_list)
Output:[-2,-4,-3, 0, 0, 0, 4, 8, 11, 4, -3, -1, -2, -3, -3, 0]
慕虎7371278
TA貢獻1802條經驗 獲得超4個贊
您必須迭代列表并添加數字，如下所示：
list = [-2, -2, -1, 1, -1, 1, 3, 5, 6, -2, -1, 0, -2, -1, -2, 2]
new_list = list[0] # We just take the first element of the list, because we don't add anything
for number, element in enumerate(list[1:]):
new_list.append(element + list[number - 1])
或者更pythonic的方式：
new_list = [list[0]].extend([element + list[number - 1] for number, element in enumerate (list[1:])
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