问题
I've written a function in python that returns a list, for example
[(1,1),(2,2),(3,3)]
But i want the output as a string so i can replace the comma with another char so the output would be
'1@1' '2@2' '3@3'
Any easy way around this?:) Thanks for any tips in advance
回答1:
This looks like a list of tuples, where each tuple has two elements.
' '.join(['%d@%d' % (t[0],t[1]) for t in l])
Which can of course be simplified to:
' '.join(['%d@%d' % t for t in l])
Or even:
' '.join(map(lambda t: '%d@%d' % t, l))
Where l is your original list. This generates 'number@number' pairs for each tuple in the list. These pairs are then joined with spaces (' ').
The join syntax looked a little weird to me when I first started woking with Python, but the documentation was a huge help.
回答2:
You could convert the tuples to strings by using the % operator with a list comprehension or generator expression, e.g.
ll = [(1,1), (2,2), (3,3)]
['%d@%d' % aa for aa in ll]
This would return a list of strings like:
['1@1', '2@2', '3@3']
You can concatenate the resulting list of strings together for output. This article describes half a dozen different approaches with benchmarks and analysis of their relative merits.
回答3:
' '.join([str(a)+"@"+str(b) for (a,b) in [(1,1),(2,2),(3,3)]])
or for arbitrary tuples in the list,
' '.join(['@'.join([str(v) for v in k]) for k in [(1,1),(2,2),(3,3)]])
回答4:
In [1]: ' '.join('%d@%d' % (el[0], el[1]) for el in [(1,1),(2,2),(3,3)])
Out[1]: '1@1 2@2 3@3'
回答5:
[ str(e[0]) + ',' + str(e[1]) for e in [(1,1), (2,2), (3,3)] ]
This is if you want them in a collection of string, I didn't understand it if you want a single output string or a collection.
回答6:
[str(item).replace(',','@') for item in [(1,1),(2,2),(3,3)]]
回答7:
You only need join and str in a generator comprehension.
>>> ['@'.join(str(i) for i in t) for t in l]
['1@1', '2@2', '3@3']
>>> ' '.join('@'.join(str(i) for i in t) for t in l)
'1@1 2@2 3@3'
回答8:
you could use the repr function and then just replace bits of the string:
>>> original = [(1,1),(2,2),(3,3)]
>>> intermediate = repr(original)
>>> print intermediate
[(1, 1), (2, 2), (3, 3)]
>>> final = intermediate.replace('), (', ' ').replace('[(','').replace(')]','').replace(', ','@')
>>> print final
1@1 2@2 3@3
but this will only work if you know for certain that none of tuples have the following character sequences which need to be preserved in the final result: ), (, [(, )], ,
来源：https://stackoverflow.com/questions/4284648/converting-lists-of-tuples-to-strings-python