将另一个元组添加到元组元组中

Question

我有以下元组元组:

my_choices=(
         ('1','first choice'),
         ('2','second choice'),
         ('3','third choice')
)

我想在它的开头添加另一个元组

another_choice = ('0', 'zero choice')

我怎样才能做到这一点？

结果将是:

final_choices=(
             ('0', 'zero choice')
             ('1','first choice'),
             ('2','second choice'),
             ('3','third choice')
    )

Answer 1

构建另一个tuple-of-tuples another_choice,然后连接:

final_choices = (another_choice,) + my_choices

或者,考虑my_choices使用方括号而不是括号来制作元组列表而不是元组元组:

my_choices=[
     ('1','first choice'),
     ('2','second choice'),
     ('3','third choice')
]

然后你可以简单地做:

my_choices.insert(0, another_choice)

Answer 2

不要转换为列表并返回,这是不必要的开销.+连接元组.

>>> foo = ((1,),(2,),(3,))
>>> foo = ((0,),) + foo
>>> foo
((0,), (1,), (2,), (3,))

Answer 3

或者，使用元组连接

IE

final_choices = (another_choice,) + my_choices