micropython/tests/basics/builtin_override.py

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# test overriding builtins
import builtins
# override generic builtin
try:
builtins.abs = lambda x: x + 1
except AttributeError:
print("SKIP")
raise SystemExit
print(abs(1))
# __build_class__ is handled in a special way
builtins.__build_class__ = lambda x, y: ('class', y)
class A:
pass
print(A)