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py3
help(dict.setdefault)
Help on method_descriptor:
setdefault(...)
D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D
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if item in
dict_
, либо при помощи setdefault
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for _ in range(attempts):
try:
...
except SomeExteption as e:
last_exception = e
else:
break
else:
raise last_exception
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