micropython/tests/basics/dict_fromkeys.py

d = dict.fromkeys([1, 2, 3, 4])
l = list(d.keys())
l.sort()
print(l)

d = dict.fromkeys([1, 2, 3, 4], 42)
l = list(d.values())
l.sort()
print(l)

# argument to fromkeys is a generator
d = dict.fromkeys(i + 1 for i in range(1))
print(d)