a = {"foo": 5}

assert exec("assert globals()[\"foo\"] == 5", a) is None

assert exec("assert locals()[\"foo\"] == 5", a) is None

bar = 5

assert exec("assert globals()[\"bar\"] == 5") is None

assert exec("assert locals()[\"bar\"] == 5") is None

assert exec("assert globals()[\"bar\"] == 5", None, a) is None

assert exec("assert locals()[\"foo\"] == 5", None, a) is None

b = {"foo": 6}

assert exec("assert globals()[\"foo\"] == 5", a, b) is None

assert exec("assert locals()[\"foo\"] == 6", a, b) is None

c = {"__builtins__" : {"int": 5, "exec": exec, "globals": globals, "AssertionError": AssertionError}}

assert exec("assert int == 5", c) is None

assert exec("""def a():

return int

assert a() == 5""", c) is None

assert exec("assert exec(\"assert int == 5\") is None", c) is None

assert exec("assert globals().get(\"int\") is None", c) is None

class A:

def keys(self): return ()

def __getitem__(self, val): raise KeyError

assert exec("assert locals().__class__ is A", None, A()) is None

def a():

global x

x = 5

assert exec(a.__code__) is None

assert x == 5