将2个元素列表转换为dict

Question

I know about few of the questions answered here on SO about dict(list) ie

l = [['a',1] ['b',2]]

and do dict(l) then we get:

{'a': 1, 'b': 2}

But how to make a list with 2 elements

l = ['a',1]

become a dictionary such as:

{'a':1}

using the dict function?

Answer 1

dict expects an iterable of two-item iterables, so you will need to put l in a list:

>>> l = ['a',1]
>>> dict([l])
{'a': 1}
>>>

Note that you could also use a tuple:

>>> l = ['a',1]
>>> dict((l,))
{'a': 1}
>>>

Answer 2

This works for multiple elements in the list

>>> l = ['a',1,'b',2]
>>> i = [(l[i],l[i+1]) for i in range(0,len(l),2)]
>>> dict(i)
{'a': 1, 'b': 2}

Answer 3

For one element, dict([l]) would work. For multiple key/value pairs in a flattened list, you could use zip() :

In [5]: l = ['a', 1, 'b', 2]

In [6]: dict(zip(l[::2], l[1::2]))
Out[6]: {'a': 1, 'b': 2}