curious syntax with dictionary item

[inselbuch]

d = {}
a = "hello"
d['x'] = a,
print(d)

Here's the result:

{'x': ('hello',)}

Python created the item as a two-element list maybe?

Consider:

>>> print(d["x"][0])
hello

Do you wonder what element 1 is... I do... anticipation...

IndexError: tuple index out of range