Separate list of objects in Python

July 5, 2022

I need to separate a list of objects in Python but I don’t know how to do and don’t found the solution.

My list is 244 cells of data like that :

{'x':-9.717017,'y':-14.0228567,'z':145.401215}

and I want, as a result, 3 lists with all the ‘x’, all the ‘y’ and all the ‘z’.
The original list is express as :

['{'x':-9.717017,'y':-14.0228567,'z':145.401215}', ... , '{'x':-6.44751644,'y':-65.20397,'z':-67.7079239}'].

Thanks a lot.

>Solution :

Loop over the list, and call ast.literal_eval() to convert each string to a dictionary. Then append each item in the dictionary to the appropriate list.

import ast

x_list = []
y_list = []
z_list = []
for item in data:
    d = ast.literal_eval(item)
    x_list.append(d['x'])
    y_list.append(d['y'])
    z_list.append(d['z'])