英文:
How to change datatype of each item in a list of tuples
问题
I've generated something that looks like this:
list = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0'),....]
I'd like to format this object so that Index 0 of each is a str, Index 1 of each is a str, and Index 2 is an int or a float. And have that propagate down the whole object so that it turns into this:
list = [("94028", "Evening", 2.23), ("94028", "Night", 1.16), ("94028", "Morning", 2.0),....]
How can I do this?
Tried:
for d in list:
d[1] = int(d[1])
Doesn't work.
英文:
I've generated something that looks like this:
list = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0'),....
I'd like to format this object so that Index 0 of each is a str, Index 1 of each is a str, and Index 2 is an int or a float. And have that propagate down the whole object so that it turns into this:
list = [("94028", "Evening", 2.23), ("94028", "Night", 1.16), ("94028", "Morning", 2.0),....
How can I do this?
Tried:
for d in list:
d[1] = int(d[1])
Doesn't work.
答案1
得分: 2
你不能修改元组。它们是不可变的。你唯一能做的是创建一个新元组并将其赋值给旧元组，或者只需使用列表推导重新创建列表并根据需要编辑元素。
l = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0')]
l = [(el[0], el[1], float(el[2])) for el in l]
英文:
You can't modify tuples. They are immutable. Best you can do is create a new tuple and assign it in place of an old one or just recreate the list with comprehension editing elements as necessary.
l = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0')]
l = [(el[0], el[1], float(el[2])) for el in l]
答案2
得分: 1
你无法修改元组。但你可以创建新的元组并将其放在原来的位置：
for i, d in enumerate(list):
list[i] = (*d[:2], float(d[2]))
英文:
You can't modify the tuples. But you can make new tuples and put them in their place:
for i, d in enumerate(list):
list[i] = (*d[:2], float(d[2]))
答案3
得分: 0
您的初始尝试使用循环来尝试修改现有元组，这是不可能的，因为元组是不可变的。相反，您需要创建一个带有所需修改的新列表。
original_list = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0')]
formatted_list = []
for item in original_list:
formatted_item = (item[0], item[1], float(item[2]))
formatted_list.append(formatted_item)
print(formatted_list)
英文:
Your original attempt used a loop to try to modify the existing tuples, which isn't possible because tuples are immutable. Instead, you need to create new list with the desired modifications.
original_list = [('94028', 'Evening', '2.23'), ('94028', 'Night', '1.16'), ('94028', 'Morning', '2.0')]
formatted_list = []
for item in original_list:
formatted_item = (item[0], item[1], float(item[2]))
formatted_list.append(formatted_item)
print(formatted_list)
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