Error while appending to a list "ExecutionError: obj.push is not a function" (firefox 17.0.1)

In console:

def instance_repr(o):
    if isinstance(o, list):
        l = []
        for i in o:
            l.append( instance_repr(i) )
        s = "[ %s ]" % ", ".join(l)
    elif isinstance(o, str):
        # TODO other control characters
        s = str(o)
        s = s.replace("'", "\\'")
    elif isinstance(o, int):
        s = str(o)
    else:
        s = o.__class__
    return s

n = [ 1, 2, 3, 4 ]
print( instance_repr(n) )

n = [ "A", "B", "C", "D" ]
print( instance_repr(n) )

Result in:
[ 1, 2, 3, 4 ]
and the given error

For some strange reason, while dealing with the second test case,
it seems that the code ends up trying do perform an "append" on "A" string.

Notice that using an intermediate variable addresses the issue:
            l.append( instance_repr(i) )
replaced by
            x = instance_repr(i)
            l.append(x)

Original issue reported on code.google.com by pedro.ro...@gmail.com on 30 Dec 2012 at 10:40

sgzwiz / brython

Error while appending to a list "ExecutionError: obj.push is not a function" (firefox 17.0.1) #25