How to print all the instances of a class in python?

Question

I want to get all the instances created for a class. Is there any way to get the instances without importing any module ?

I tried this way to append self in a class attribute.

class A(object):
    instances = []

    def __init__(self, foo):
        self.foo = foo
        A.instances.append(self)
        
foo = A("hi")
bar = A("Hey")
star = A("Hero")

for instance in A.instances:
    print("Ins is ",instance)

Output

<__main__.A object at 0x148b8b6e0780>,
<__main__.A object at 0x148b8b6e0780>,
<__main__.A object at 0x148b8b6e0780>

I expect it to print foo,bar,star. Is there any way to get it in class without any module?

Answer 1

you could do the following, if I got you right :

Proposal

tmp = globals().copy()
print(tmp)

for k,v in tmp.items():
    if isinstance(v, A):
        print(k)

You must copy the global variable dictionary, because otherwise i will be changed with the first instantiation in the for-loop:

Result:

foo
bar
star