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172edited Oct 5, 2011 at 23:08It hardly qualifies as clever - but subclassing is your friend:
class keydefaultdict(defaultdict):def __missing__(self, key):if self.default_factory is None:raise KeyError( key )else:ret = self[key] = self.default_factory(key)return retd = keydefaultdict(C)d[x] # returns C(x)Content Under CC-BY-SA license python - Is there a clever way to pass the key to defaultdict's …
No, there is not. The defaultdict implementation can not be configured to pass missing key to the default_factory out-of-the-box. Your only option is to implement your own defaultdict subclass, as suggested by @JochenRitzel, above.Explore further
python - How to make a dictionary that returns key for keys …
- In less than ten lines of pure Python (excluding docstrings, comments, andwhitespace), we now define a DefaultDict type initialized with a user-definedcallable generating default values for missing keys. Whereas the callable passedto the standard collections.defaultdict type uselessly accepts noparameters, the callable passed to our DefaultDicttype...
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Understanding the use of defaultdict in Python - Stack Overflow
WebJan 4, 2017 · defaultdict has __missing__(key) protocol to handle this error, when it can not find the key, it will call the default_factory without arguments to provide a default value for …
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python - Return a default value if a dictionary key is not available ...
WebAs mentioned elsewhere a possible issue with dct.get(key, default) is that, if key in dct but dct[key] is None, you get None not your default: >>> dct = dict(foo=123, baz=None) >>> …
python - Accessing key in factory of defaultdict - Stack Overflow
WebJan 6, 2015 · But it is possible to use defaultdict as a base class that has the behavior you want: class CustomDefaultdict(defaultdict): def __missing__(self, key): if …
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python - How to initialize defaultdict with keys? - Stack Overflow
WebMar 21, 2017 · You can append to "not existing" keys in defaultdict: >>dd['d'].append(5) >>dd >>defaultdict(list, {'d': 5}) where if you do: >>d['d'].append(5) # you'll face …
python - Iterating over key and value of defaultdict dictionaries ...
Webd = collections.defaultdict(int) d[1] = 2 d[3] = 4 for k,v in d: print "%s - %s" % (str(k), str(v)) With: Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'int' …
Python defaultdict (default) vs dict.get (key, default)
Webfrom collections import defaultdict foo = defaultdict(lambda: "bar") print(foo["hello"]) # "bar" or by using a regular dict and always using dict.get(key, default) to retrieve values: foo = …
Python how to use defaultdict fromkeys to generate a dictionary …
WebMay 4, 2017 · defaultdict(<type 'list'>, {'a': [], 'c': [], 'b': []}) Or you can use a regular Python dict with a dict comprehension to get the same thing -- no defaultdict required -- if you …
How to get key values from default dictionary in Python?
WebJan 27, 2015 · Reading from a dictionary created using defaultdict() is the same as a normal dict. To get the keys which have values > 1, you would do: my_dict = …
Python's collections.defaultdict returns default value correctly …
WebMar 18, 2015 · >>> from collections import defaultdict >>> d = defaultdict(dict) >>> 'foo' in d False >>> d['foo'] {} >>> 'foo' in d True Use defaultdict.__getitem__ (e.g. …
Python dict with default value based on key - Stack Overflow
Web0. Here is how to do it without creating any class. You can use dict.setdefault: d = {} d_default_factory = lambda key: key + 5. d.setdefault(2, d_default_factory(2)) # 7. …
python - Suppress key addition in collections.defaultdict - Stack …
WebApr 11, 2018 · When a missing key is queried in a defaultdict object, the key is automatically added to the dictionary: from collections import defaultdict d = …
python - Searching key/values with defaultdict - Stack Overflow
WebJan 18, 2012 · In your case (a defaultdict with deques as values), you may want to see whether x is in any of the deques: any(x in deq for deq in dd.itervalues()) Remember, …
How to check for a key in a defaultdict without updating the …
WebE.g., if your default value is 'ham' and in some situations you don't want to store (key, 'ham') in the defaultdict when key is not found, you can do. dct.get(key, 'ham') # will return …
Python dictionary default value when there is no key
Webhistogram[n] += 1. and. histogram[n] = histogram.get(n, 0) + 1. In the case of lists, setdefault can be a bit more useful as it returns the value, i.e.: dict_of_lists.setdefault(key, …
Python defaultdict throws KeyError with default_factory set?
WebMar 31, 2021 · You are right in saying that defaultdict can't throw a KeyError but look at your code. First do self._config['adapterSettings'] then you index that with …
Can defaultdict accept callables dependent on the given missing …
WebApr 7, 2017 · What you can do, though, is subclass defaultdict and define the __missing__ method: class CustomDefaultDict(collections.defaultdict): def __missing__(self, key): …
Python defaultdict but support key-wise default value
WebAug 2, 2023 · from collections import defaultdict class MyDefaultDict(defaultdict): def __missing__(self, key): self[key] = f'#You can inject text here by setting {key}' return …
python - Add missing keys to `dict` in `list` - Stack Overflow
WebApr 22, 2018 · Simply turn your dicts into defaultdicts wherever it is that you're defining them. - defaultdict(int, your_dictionary) You can then access this dict for your plot …
Python defaultdict that does not insert missing values
WebFeb 7, 2015 · While dict [key] adds the key, dict.get (key, default=None) will NOT add the key to the dictionary: import collections. d = collections.defaultdict(int) assert d['test1'] …
Adding missing keys in dictionary in Python - Stack Overflow
WebNov 25, 2015 · max_key = max(max(d) for d in L) empty = dict.fromkeys(range(max_key + 1), 0) L1 = [dict(empty, **d) for d in L] This uses an 'empty' dictionary as a base to quickly …
python - defaultdict automatically creating dictionary entries for …
WebDec 18, 2021 · mydict['a'].append('foo') # example with defaultdict. mydefaultdict = defaultdict(list) mydefultdict['a'].append('foo') # Now, imagine a typo occurs accessing …
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