如何解决在循环中从arr [i]的值制作python列表的一部分
list1 = [1,4,16,64]
right = []
left = []
for i in range(len(list1)):
pass
i = 1 || arr[1] = 4 || left = [1] || right = [16,64]
i = 2 || arr[2] = 16 || left = [1,4] || right = [64]
根据arr [i]的值将列表分为两部分。例如:如果i = 1,则值为4。那么列表中所有小于4的值都应放在左侧列表中,而所有大于4的值都应放在左侧列表中4应该继续
解决方法
您可以分割列表。左边可以从开头到i,右边可以从i + 1到结尾
list1 = [1,4,16,64].sort()
right = []
left = []
for i in range(len(list1)):
right = list1[i+1:]
left = list1[:i]
print(f"i = {i} || arr[{i}] = {list1[i]} || left = {left} || right = {right}")
输出:
i = 0 || arr[0] = 1 || left = [] || right = [4,64]
i = 1 || arr[1] = 4 || left = [1] || right = [16,64]
i = 2 || arr[2] = 16 || left = [1,4] || right = [64]
i = 3 || arr[3] = 64 || left = [1,16] || right = []
,
这对您有帮助:
list1 = [1,64]
right = []
left = []
for i in range(len(list1)):
if list1[i] <= 4:
left.append(list1[i])
else:
right.append(list1[i])
print(f"i = {i} || arr[{i}] = {list1[i]} || left = {left} || right = {right}")
输出:
i = 0 || arr[0] = 1 || left = [1] || right = []
i = 1 || arr[1] = 4 || left = [1,4] || right = []
i = 2 || arr[2] = 16 || left = [1,4] || right = [16]
i = 3 || arr[3] = 64 || left = [1,4] || right = [16,64]
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