unicode weirdness

[Skaperen]

this is probably a feature. when i run this code (python3 required):

out = '\n'*8
for n in range(0,1024):
    if n%32 == 0:
        if out:
            print(out)
        out = hex(0x100000000+n)[-8:] + '  '
    if len(repr(chr(n))) < 4:
        out = out + ' ' + chr(n)
    else:
        out = out + ' .'
print(out)

it outputs a bunch of ASCII then a bunch more non-ASCII characters. but starting at line 00000300 a few lines are shorter and more compact, despite the space included between characters (see line 8 in the code). even weirder, at 00000320 and 00000340, characters have backed up over the spaces that came before them.

i am wondering how i can detect this given a character code so i can format my output correctly.