How to get attribute of Object that inside list of list

Question

Can someone guide me how to extract the attribute of object that is inside a list of list. For example, I got:

class Symbol:
    def __init__(self, name, mtype, value = None):
        self.name = name
        self.mtype = mtype
        self.value = value


# ... some more code

Then after running some code, I will get list of variable such as:

list_var = [Symbol(varname_1, vartype_1), Symbol(varname_2, vartype_2), ..., Symbol(varname_n, vartype_n)]

So, I would like to get only the vartype as the list of vartype i.e

list(vartype_1,...vartype_n)

use [obj.mtype for obj in list_var]

eyllanesc
– eyllanesc

2019-01-01 04:23:41 +00:00
Commented Jan 1, 2019 at 4:23 — eyllanesc
– eyllanesc, Commented Jan 1, 2019 at 4:23

Primusa · Accepted Answer · 2019-01-01 04:24:09Z

1

You can get the attribute of any object by doing object.attribute, or in your case Symbol().mtype

The fact that it's in a list makes no difference. Iterate over the list and grab the attribute for each element:

n_lst = [symbol.mtype for symbol in list_var]

answered Jan 1, 2019 at 4:24

Primusa

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U13-Forward · Accepted Answer · 2019-01-01 07:05:43Z

0

Or use map:

n_lst = list(map(lambda x: x.mtype,list_var))

answered Jan 1, 2019 at 7:05

U13-Forward

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