On Thu, 26 May 2005 19:53:38 +0800, flyaflya wrote:
> a = "(1,2,3)"
> I want convert a to tuple:(1,2,3),but tuple(a) return ('(', '1', ',',
> '2', ',', '3', ')') not (1,2,3)
Others have already given some suggestions. Here are some others.
You didn't say where the input string a came from. Do you control
it? Instead of using:
String_Tuple_To_Real_Tuple("(1,2,3)")
can you just create the tuple in the first place?
a = (1, 2, 3)
Second suggestion: if you know that the input string will ALWAYS be in the
form "(1,2,3)" then you can do this:
a = "(1,2,3)"
a = a[1:-1] # deletes leading and trailing parentheses
a = a.split(",") # creates a list ["1", "2", "3"] (items are strings)
a = [int(x) for x in a] # creates a list [1, 2, 3] (items are integers)
a = tuple(a) # coverts to a tuple
or as a one-liner:
a = "(1,2,3)"
a = tuple([int(x) for x in a[1:-1].split(",")])
Best of all, wrap your logic in a function definition with some
error-checking:
def String_Tuple_To_Real_Tuple(s):
"""Return a tuple of ints from a string that looks like a tuple."""
if not s:
return ()
if (s[0] == "(") and s[-1] == ")"):
s = s[1:-1]
else:
raise ValueError("Missing bracket(s) in string.")
return tuple([int(x) for x in s.split(",")])
Hope this helps,
--
Steven.
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