How to build a string from key/value pairs in dict

Question

If I have a dictionary such as:

clues = {'w':'e','r':'t'}

How do I get the first of each letter in the two to join together in a string, it is something like...

for clue in clues:
   clue = ''.join( 

However I don't know how to get them into a string from this...

Answer 1

Edit:

You can use a list comprehension for that:

>>> clues = {'w':'e','r':'t'}
>>> [''.join(x) for x in (clues, clues.values())]
['wr', 'et']
>>>

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how would you get the first of each letter in the two to join together in a string

I think you are talking about the dictionary's keys. If so, then you can use str.join :

>>> clues = {'w':'e','r':'t'}
>>> ''.join(clues)
'wr'
>>>

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Also, iterating over a dictionary (which is what str.join is doing) will yield its keys. Thus, there is no need to do:

''.join(clues.keys())

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Finally, @DSM made a good point. Dictionaries are naturally unordered in Python. Meaning, you could get rw just as easily as you get wr .

If you want a dictionary with guarunteed order, check out collections.OrderedDict .

Answer 2

如果要将所有键都连接到字符串中，请尝试以下操作：

''.join(clues.keys())

Answer 3

It's not entirely clear what your question is, but if you want to join the key and value together, storing that result into a new set , this would be the solution:

>>> {''.join(key_value) for key_value in clues.items()}
set(['rt', 'we'])

Written long hand for clarity:

out_set = set()
for key_value in clues.items():
    key_value_joined = ''.join(key_value)
    out_set.add(key_value_joined)

Answer 4

这应该可以解决问题：

''.join(clues.keys())