*Background*
It is frequently desirable to delete a dictionary entry if the key exists. It
is necessary to check that the key exists or, alternatively, handle a KeyError:
for, where `d` is a `dict`, and `k` is a valid hashable key, `del d[k]` raises
KeyError if `k` does not exist.
Example:
```
if k in d:
del d[k]
```
*Idea*
Use the `-=` operator with the key as the right operand to delete a dictionary
if the key exists.
*Demonstration-of-Concept*
```
class DemoDict(dict):
def __init__(self, obj):
super().__init__(obj)
def __isub__(self, other):
if other in self:
del self[other]
return self
if __name__ == '__main__':
given = {'a': 1, 'b': 2, 'c': 3, 'd': 4}
demo = DemoDict(given)
demo -= 'c'
assert(demo == {'a': 1, 'b': 2, 'd': 4})
```
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