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
orig_build_class = __build_class__
builtins.__build_class__ = lambda x, y: ('class', y)
class A:
pass
print(A)
builtins.__build_class__ = orig_build_class
# __import__ is handled in a special way
def custom_import(name, globals, locals, fromlist, level):
print('import', name, fromlist, level)
class M:
a = 1
b = 2
return M
builtins.__import__ = custom_import
__import__('A', None, None, None, 0)
import a
import a.b
from a import a
from a.b import a, b
from .a import a
from ..a import a, b