Two module-level statements each build the same string at runtime via `''.join(...)`. The strings contain only identifier-valid characters versus a space. What does CPython's automatic interning do?
a = 'abc'
b = ''.join(['a', 'b', 'c'])
c = 'a b'
d = ''.join(['a', ' ', 'b'])
print(a is b, c is d)