python - How do I allow a user to input vectors rather than strings? -

i'm trying make program allow user input vectors of form (x,y,z) using python's built in input() function.

if entered in python out using input() function indexes each vector separately. example,

>>> z = (1,2,3), (4,5,6), (7,8,9) >>> z[1] (4, 5, 6)

but when try use input function run following problem.

>>> z = input('what vectors?  ') vectors?  (1,2,3), (4,5,6), (7,8,9) >>> z[1] '1'

why using input function turn string , there way around this?

thanks

in python 3, input returns string. need convert string. type of input recommend using liter_eval module ast:

import ast vectors = ast.literal_eval('(1,2,3), (4,5,6), (7,8,9)') vectors[1]     #(4, 5, 6)

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