py3

i = 123, 123, 123
i_ = str(i)
a,b,c = i_
print(a,b,c)

Traceback (most recent call last):
  File "733168043/source.py", line 3, in <module>
    a,b,c = i_
ValueError: too many values to unpack (expected 3)

py3

def digits(n):
    if -10<n<10:
        yield n
    else:
        yield from digits(n//10)
        yield n%10
print(*digits(123))

1 2 3

py3

def digits(n):
    if -10<n<10:
        yield n
    else:
        yield from digits(n//10)
        yield n%10
print(*digits(123))

1 2 3

py3

def digits(n):
    n = abs(n)
    if -10<n<10:
        yield n
    else:
        yield from digits(n//10)
        yield n%10
print(*digits(-123))

1 2 3