10 examples of 'python get value from dictionary if key exists' in Python

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565def TryGetValue(self,key,value):
566 """ TryGetValue(self: IDictionary[TKey,TValue],key: TKey) -> (bool,TValue) """
567 pass
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433class IReadOnlyList(IReadOnlyCollection[T], IEnumerable[T], IEnumerable):
434 # no doc
435 def __contains__(self, *args): #cannot find CLR method
316def __getitem__(self, key):
317 """Return the first data value for this key;
318 raises KeyError if not found.
319
320 :param key: The key to be looked up.
321 :raise KeyError: if the key does not exist.
322 """
323 if key in self:
324 lst = dict.__getitem__(self, key)
325 if len(lst) > 0:
326 return lst[0]
327 if self.key_error_exception:
328 raise self.key_error_exception(key)
5def _find_dict_in_list(list_of_dict, key, val):
6 """Given a list of dictionaries, return the first dictionary that has the
7 given key:value pair.
8 """
9 try:
10 for d in list_of_dict:
11 if (key, val) in d.items():
12 return d
13 except TypeError:
14 pass
102def _find_key(d, key):
103 if not d:
104 return None
105 for k, v in d.items()[:]:
106 if k == key:
107 return d
108 else:
109 result = _find_key(v, key)
110 if result is not None:
111 return result
31def dict_lookup(dic, key_path, default=None):
32 """
33 Look up value in a nested dict
34
35 Args:
36 dic: The dictionary to search
37 key_path: An iterable containing an ordered list of dict keys to
38 traverse
39 default: Value to return in case nothing is found
40
41 Returns:
42 Value of the dict at the nested location given, or default if no value
43 was found
44 """
45
46 for k in key_path:
47 if k in dic:
48 dic = dic[k]
49 else:
50 return default
51 return dic
92def getDic(self, key = 'process'):
93 """return the list of processes of all active terminal"""
94 return [self.dic[terminal][key] for terminal in self.dic if self.dic[terminal]['active']]
1def contains_val(data, key, value):
2 """
3 check if certain key has certain value, return true if so and false otherwise
4 """
5 # try to get value variable from parser specific variables
6 value = _ttp_["parser_object"].vars.get(value, value)
7 if not value in data.get(key, ""):
8 return data, False
9 return data, None
22def _get_value_by_path(source_dict, key_path,
23 ignore_key_error=False, default=""):
24 """Get key value from nested dict by path.
25
26 Args:
27 source_dict: The dict that we look into.
28 key_path: A list has the path of key. e.g. [parent_dict, child_dict, key_name].
29 ignore_key_error: Ignore KeyError if the key is not found in provided path.
30 default: Set default value if the key is not found in provided path.
31
32 Returns:
33 If key is found in provided path, it will be returned.
34 If ignore_key_error is True, None will be returned.
35 If default is defined and key is not found, default will be returned.
36 """
37
38 key_value = ""
39 try:
40 # Reduce key path, where it get value from nested dict.
41 # a replacement for buildin reduce function.
42 for key in key_path:
43 if isinstance(source_dict.get(key), dict) and len(key_path) > 1:
44 source_dict = source_dict.get(key)
45 key_path = key_path[1:]
46 _get_value_by_path(source_dict, key_path,
47 ignore_key_error=ignore_key_error, default=default)
48 else:
49 key_value = source_dict[key]
50
51 # How to set the key value, if the key was not found.
52 except KeyError as key_name:
53 if default:
54 key_value = default
55 elif not default and ignore_key_error:
56 key_value = None
57 elif not key_value and not ignore_key_error:
58 sys.exit("The key %s is not found. Please remember, Python is case sensitive." % key_name)
59 return key_value
67def __getitem__(self, key):
68 self.__missing__(key)
69 return self.value

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