Python: string join multiple attributes from object

Question

i have an orm based object list. i now want to concatenate some attributes delimited by the "|" (pipe) and then concatenate all objects by using "\n".

i tried:

class A(object):
    def __init__(self, name, age):
        self.name = name
        self.age = age

obj_list = [A("James", 42), A("Amy", "23")]
"\n".join("|".join(o.name, o.age for o in obj_list))

File "<console>", line 1
SyntaxError: Generator expression must be parenthesized if not sole Argument

what exactly must be parenthesized?

Any hints?

Tank you.

Answer 1

I think this is what you wanted to achieve:

obj_list = [A("James", 42), A("Amy", "23")]
"\n".join("|".join((o.name, o.age)) for o in obj_list)

Result:

James|42
Amy|23

Note: if your object contains non-string attributes, you have to convert those to strings, e.g. "|".join(o.name, str(o.age)).