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I have some problems converting data which I imported from a txt-file into proper Mathematica expressions. After importing my data looks like

sample = {"{3", "\"string1\"", 45, "\"string2\"", 8.32, " {2013", 8, 1, 0, 6, " 19}", "0.}"}

Now I would like to transform it into

converted = {3, "string1", 45, "string2", 8.32`, {2013, 8, 1, 0, 6, 19}, 0.}

I imported the file using Import[file.txt,"Data"]

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    $\begingroup$ If you provide a sample from file.txt we might be able to make Import do a part of the job for you. $\endgroup$
    – C. E.
    Feb 21 '14 at 10:34
  • $\begingroup$ Try to import as "Package", not "Data" if you have a list written using Mathematica syntax. $\endgroup$
    – Szabolcs
    Feb 21 '14 at 18:21
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You can Map with this:

ToExpression[StringJoin @@ Riffle[ToString /@ sample, ","]]
{3, "string1", 45, "string2", 8.32`, {2013, 8, 1, 0, 6, 19}, 0.`} 
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  • $\begingroup$ Thanks for the elegant solution, solved my problem entirely $\endgroup$
    – RMMA
    Feb 21 '14 at 11:19
  • $\begingroup$ @Kuba, Nice solution, but I wander: If this oddly shaped "sample" was imported from a text file, Wouldn't probably be better to parse the data correctly in the first instance, instead of correcting it afterwards? $\endgroup$
    – rhermans
    Feb 21 '14 at 14:38
  • $\begingroup$ @rhermans That's what Pickett and Szabolcs are suggesting, I agree but OP has not responded to the comments. $\endgroup$
    – Kuba
    Feb 21 '14 at 21:56
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Another solution without the use of Riffle :

ToExpression@StringReplace[ToString[sample], {"\\" -> "", "{{" -> "{", "}}" -> "}"}]
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    $\begingroup$ Congratulations on your fanatic badge :) (temporary message) $\endgroup$ Feb 25 '14 at 17:28
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    $\begingroup$ Thank you!(permanent message):-P $\endgroup$
    – tchronis
    Feb 25 '14 at 18:05

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