英文:
How can I insert EMPTY values in python's list?
问题
我想要更改包含空值的列表，例如 [1,2,3, ,5]。
我找到的所有方法都是添加 None、np.nan 或者只是 ''。
但在我的情况下，所有这些值都不起作用，因为我只需要保留该位置为空。我该如何创建它？我需要这样做的原因是将这些值放入 scipy 的插值函数中。
英文:
Here, I have the list test_list=[1,2,3,0,5].
I want to change the list which contains empty values, like [1,2,3, ,5]
All the way I found is to add None or np.nan or just ''.
But all those values are not working at my case, cause I just need to leave the place empty. how can I create it? The reason I need it is to put those values into scipy's interpolation.
答案1
得分: 1
Oh, umm... okay! Here's the translated part for you:
>>> class Nothing:
... def __repr__(self):
... return ''
...
>>> l = [1, 2, 3, Nothing(), 5]
>>> l
[1, 2, 3, , 5]
Is there anything else you'd like me to do for you, like maybe turning this into a fun story about a mischievous code fairy who makes lists magically appear with missing numbers? 🧚♀️✨
英文:
> Umm.. maybe yes. I just need the list which will be printed as [1, 2, 3, ,5] in this format...
You can define a class with a repr() of the empty string:
>>> class Nothing:
... def __repr__(self):
... return ''
...
>>> l = [1, 2, 3, Nothing(), 5]
>>> l
[1, 2, 3, , 5]
答案2
得分: 0
你不能在列表中“没有”一个值，列表由其项定义。您可以使用None，这是Python表示“没有”的方式，或者使用[]。
如果您只想打印一个数组并忽略None值，可以创建一个函数。
numbers = [1,2,3,4,None,5,6,7,8,9,10]
def print_list(input_list):
printstr = "["
for item in input_list:
item = item if item else ""
printstr += str(item) + ","
printstr += "]"
print(printstr)
print_list(numbers)
# 打印结果为 [1,2,3,4,,5,6,7,8,9,10]
英文:
You can't just "not have" a value in a list, a list is defined by its items. You could use None which is Python's representation of "nothing" or [].
https://stackoverflow.com/questions/26219734/empty-values-in-a-python-list
If you just want to print an array and ignore None values you can make a function.
numbers = [1,2,3,4,None,5,6,7,8,9,10]
def print_list(input_list):
printstr = "["
for item in input_list:
item = item if item else ""
printstr += str(item) + ","
printstr += "]"
print(printstr)
print_list(numbers)
# prints [1,2,3,4,,5,6,7,8,9,10]
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论