How to convert strings into integers in python?

Question

I have a tuple of tuples from MySQL query like this:

T1 = (('13', '17', '18', '21', '32'),

      ('07', '11', '13', '14', '28'),

      ('01', '05', '06', '08', '15', '16'))

I'd like to convert all the string elements into integers and put it back nicely to list of lists this time:

T2 = [[13, 17, 18, 21, 32], [7, 11, 13, 14, 28], [1, 5, 6, 8, 15, 16]]

I tried to achieve it with "eval" but didn't get any decent result yet.

Answer 1

int() is the Python standard built-in function to convert a string into an integer value. You call it with a string containing a number as the argument, and it returns the number converted to an actual integer:

print int("1") + 1

The above prints 2.

If you know the structure of your list (that it simply contains lists, only one level), you could do this:

T2 = [map(int, x) for x in T1]

How to convert strings into integers in python?

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