Python3 ValueError: too many values to unpack with for loop - python-3.x

Question

I've seen this same question asked around, but it's always with something like:
val1, val2 = input("Enter 2 numbers")
My problem is different.
I have two strings, str1 and str2. I want to compare them byte-by-byte such that the output would look something like this:
str1 str2
0A 0A
20 20
41 41
42 42
43 43
31 31
32 32
33 33
2E 21
So, I've tried various syntaxes to compare them, but it always ends in the same error. Here's one of my latest attempts:
#!/usr/bin/python3
for c1, c2 in (tuple("\n ABC123."), tuple("\n ABC123!")):
print("%02X %02X" % (ord(c1), ord(c2)))
And the error:
$ python3 test.py
Traceback (most recent call last):
File "test.py", line 1, in <module>
ValueError: too many values to unpack (expected 2)
Of course, this line:
for c1, c2 in (tuple("\n ABC123."), tuple("\n ABC123!")):
has gone through many different iterations:
for c1, c2 in "asdf", "asdf"
for c1, c2 in list("asdf"), list("asdf")
for c1, c2 in tuple("asdf"), tuple("asdf")
for c1, c2 in (tuple("asdf"), tuple("asdf"))
for (c1, c2) in (tuple("asdf"), tuple("asdf"))
All of which threw the same error.
I don't think I quite understand python's zipping/unzipping syntax, and I'm just about ready to resort hacking a low-level solution together.
Any ideas?

Answer 1

Okay, so I ended up doing this:
for char in zip(s1,s2):
print("%02X %02X" % ( ord(char[0]), ord(char[1]) ))
However, I notice that if I happen to have two lists of differing lengths, the longer list seems to get truncated at the end. For example:
s1 = "\n ABC123."
s2 = "\n ABC123!."
0A 0A
20 20
41 41
42 42
43 43
31 31
32 32
33 33
2E 21
# !! <-- There is no "2E"
So I guess I could work around that by printing the len() for each string, and then padding the shorter one to meet the longer one.