Re: Extract String From Enclosing Tuple

On Feb 28, 12:40 pm, rshep...@xxxxxxxxxxxxxxxxxxxxxx wrote:
I'm a bit embarrassed to have to ask for help on this, but I'm not finding
the solution in the docs I have here.

Data are assembled for writing to a database table. A representative tuple
looks like this:

('eco', "(u'Roads',)", 0.073969887301348305)

Pysqlite doesn't like the format of the middle term:
pysqlite2.dbapi2.InterfaceError: Error binding parameter 1 - probably
unsupported type.

I want to extract the 'Roads', part from the double-quoted enclosing
tuple.

(snipped)



Perhaps something like:

t = ('eco', "(u'Roads',)", 0.073969887301348305)
t2 = eval(t[1], { '__builtins__' : {} }, {} )
t2
(u'Roads',)
t2[0].encode('ascii')
'Roads'


import itertools
tuple(itertools.chain((t[0], t2[0].encode('ascii')), t[2:]))
('eco', 'Roads', 0.073969887301348305)

tuple(itertools.chain((t[0], (t2[0].encode('ascii'),)), t[2:]))
('eco', ('Roads',), 0.073969887301348305)


--
Hope this helps,
Steven

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