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How to use delattr method in fMBT

Best Python code snippet using fMBT_python

class_delattr_setattr.py

Source:class_delattr_setattr.py

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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