How to use __delattr__ method in autotest

Best Python code snippet using autotest_python Github


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1# test __delattr__ and __setattr__2# feature test for __setattr__/__delattr__3try:4 class Test():5 def __delattr__(self, attr): pass6 del Test().noexist7except AttributeError:8 print('SKIP')9 raise SystemExit10# this class just prints the calls to see if they were executed11class A():12 def __getattr__(self, attr):13 print('get', attr)14 return 115 def __setattr__(self, attr, val):16 print('set', attr, val)17 def __delattr__(self, attr):18 print('del', attr)19a = A()20# check basic behaviour21print(getattr(a, 'foo'))22setattr(a, 'bar', 2)23delattr(a, 'baz')24# check meta behaviour25getattr(a, '__getattr__') # should not call A.__getattr__26getattr(a, '__setattr__') # should not call A.__getattr__27getattr(a, '__delattr__') # should not call A.__getattr__28setattr(a, '__setattr__', 1) # should call A.__setattr__29delattr(a, '__delattr__') # should call A.__delattr__30# this class acts like a dictionary31class B:32 def __init__(self, d):33 # store the dict in the class, not instance, so34 # we don't get infinite recursion in __getattr_35 B.d = d36 def __getattr__(self, attr):37 if attr in B.d:38 return B.d[attr]39 else:40 raise AttributeError(attr)41 def __setattr__(self, attr, value):42 B.d[attr] = value43 def __delattr__(self, attr):44 del B.d[attr]45a = B({"a":1, "b":2})46print(a.a, a.b)47a.a = 348print(a.a, a.b)49del a.a50try:51 print(a.a)52except AttributeError:53 print("AttributeError")54# test object.__setattr__55class C:56 def __init__(self):57 pass58 def __setattr__(self, attr, value):59 print(attr, "=", value)60 def __delattr__(self, attr):61 print("del", attr)62c = C()63c.a = 564try:65 print(c.a)66except AttributeError:67 print("AttributeError")68object.__setattr__(c, "a", 5)69super(C, c).__setattr__("b", 6)70print(c.a)71print(c.b)72try:73 # attribute name must be string74 object.__setattr__(c, 5, 5)75except TypeError:76 print("TypeError")77# test object.__delattr__78del c.a79print(c.a)80object.__delattr__(c, "a")81try:82 print(c.a)83except AttributeError:84 print("AttributeError")85super(C, c).__delattr__("b")86try:87 print(c.b)88except AttributeError:89 print("AttributeError")90try:91 object.__delattr__(c, "c")92except AttributeError:...

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