micropython/tests/basics/dict_setdefault.py

d = {}
print(d.setdefault(1))
print(d.setdefault(1))
print(d.setdefault(5, 42))
print(d.setdefault(5, 1))
print(d[1])
print(d[5])
d.pop(5)
print(d.setdefault(5, 1))
print(d[1])
print(d[5])