Python 向元组添加项
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Python add item to the tuple
提问by Goran
I have some object.ID-s which I try to store in the user session as tuple. When I add first one it works but tuple looks like (u'2',)but when I try to add new one using mytuple = mytuple + new.idgot error can only concatenate tuple (not "unicode") to tuple.
我有一些 object.ID-s，我尝试将其作为元组存储在用户会话中。当我添加第一个时，它可以工作，但元组看起来像，(u'2',)但是当我尝试使用mytuple = mytuple + new.idgot error添加新的时can only concatenate tuple (not "unicode") to tuple。
采纳答案by Jon Clements
You need to make the second element a 1-tuple, eg:
您需要将第二个元素设为 1 元组，例如：
a = ('2',)
b = 'z'
new = a + (b,)
回答by jamylak
>>> x = (u'2',)
>>> x += u"random string"
Traceback (most recent call last):
File "<pyshell#11>", line 1, in <module>
x += u"random string"
TypeError: can only concatenate tuple (not "unicode") to tuple
>>> x += (u"random string", ) # concatenate a one-tuple instead
>>> x
(u'2', u'random string')
回答by kiriloff
From tuple to list to tuple :
从元组到列表再到元组：
a = ('2',)
b = 'b'
l = list(a)
l.append(b)
tuple(l)
Or with a longer list of items to append
或者使用更长的项目列表来附加
a = ('2',)
items = ['o', 'k', 'd', 'o']
l = list(a)
for x in items:
l.append(x)
print tuple(l)
gives you
给你
>>>
('2', 'o', 'k', 'd', 'o')
The point here is: List is a mutablesequence type. So you can change a given list by adding or removing elements. Tuple is an immutablesequence type. You can't change a tuple. So you have to create a newone.
这里的要点是：List 是一种可变序列类型。因此，您可以通过添加或删除元素来更改给定列表。元组是一种不可变的序列类型。你不能改变元组。所以你必须创建一个新的。
回答by user3798348
Tuple can only allow adding tupleto it. The best way to do it is:
元组只能允许添加tuple到它。最好的方法是：
mytuple =(u'2',)
mytuple +=(new.id,)
I tried the same scenario with the below data it all seems to be working fine.
我用下面的数据尝试了相同的场景，它似乎一切正常。
>>> mytuple = (u'2',)
>>> mytuple += ('example text',)
>>> print mytuple
(u'2','example text')
回答by nitely
回答by britodfbr
#1 form
#1 表格
a = ('x', 'y')
b = a + ('z',)
print(b)
#2 form
#2 形式
a = ('x', 'y')
b = a + tuple('b')
print(b)
回答by alphahmed
Bottom line, the easiest way to append to a tuple is to enclose the element being added with parentheses and a comma.
底线，附加到元组的最简单方法是用括号和逗号将要添加的元素括起来。
t = ('a', 4, 'string')
t = t + (5.0,)
print(t)
out: ('a', 4, 'string', 5.0)
