更新时间:2023-11-05 21:20:34
在迭代列表时不要从列表中删除项目;迭代将跳过项目,因为迭代索引未更新以说明已删除元素
Don't remove items from a list while iterating over it; iteration will skip items as the iteration index is not updated to account for elements removed.
Instead, rebuild the list minus the items you want removed, with a list comprehension with a filter:
obj['items'] = [item for item in obj['items'] if item['name']]
或首先创建列表的副本进行迭代,以使删除不会更改迭代:
or create a copy of the list first to iterate over, so that removing won't alter iteration:
for item in obj['items'][:]: # [:] creates a copy
if not item['name']:
obj['items'].remove(item)
您确实创建了一个副本,但是然后通过循环从静止状态删除的列表来忽略该副本.
You did create a copy, but then ignored that copy by looping over the list that you are deleting from still.