s = "[[A, B],[E,R], [E,G]]"
Is there a built-in way to convert this string into an array? (s[][])
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4By "array", do you mean Python list? Are the values supposed to be strings?Sven Marnach– Sven Marnach2011-06-08 10:33:11 +00:00Commented Jun 8, 2011 at 10:33
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3 Answers
There is, but in your case it will assume A B E R G to be variables, is this the case?
If this is not the case you will need to do some extra formatting with the string.
This will work if the variables A B E R G are set:
s = eval(s)
If the letters need to be strings you will have to do some kind of regexp to replace all occurrences of chars with quoted chars.
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Lauritz V. Thaulow
If the letters were meant to be strings, there is no reason not to use the much safer ast.literal_eval instead of
eval, which may execute arbitrary code if s has been tampered with.If A B E R G are not variables but just a string then you can use the following code:
tmp = ''
for c in s:
if c.isalpha():
t+="'%s'"%c
else:
t+=c
eval(t) # will give you [['A', 'B'], ['E', 'R'], ['E', 'G']]
OR:(very ugly i know but don't beat me too much - just experementing)
evel(''.join(map(lambda x: s[x[0]] if not s[x[0]].isalpha() else "'%s'" % s[x[0]], enumerate(map(lambda c: c.isalpha(), s)))))
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If you can slightly modify the string, you could use the JSON module to convert the string into list.
>>> import json
>>> s = '[["A", "B"], ["E", "R"], ["E", "G"]]'
>>> array = json.loads(s)
>>> array
[[u'A', u'B'], [u'E', u'R'], [u'E', u'G']]
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