4 examples of 'python dictionary count values per key' in Python

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29def count_value(lst, key):
30 d = {}
31 for obj in lst:
32 val = obj[key]
33 if val in d:
34 d[val] = d[val] + 1
35 else:
36 d[val] = 1
37 return d.iteritems()

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4def increment_count(count_dict, key, n=1):
5 """
6 Puts the key in the dictionary if does not exist or adds one if it does.
7 Args:
8 count_dict: a dictionary mapping a string to an integer
9 key: a string
10 """
11 if key in count_dict:
12 count_dict[key] += n
13 else:
14 count_dict[key] = n
154def sort_dict(key_counts, by_key=False):
155 '''Accept a dict of key:values (numerics) returning list of key-value tuples ordered by desc values.
157 If by_key=True, sorts by dict key.'''
158 sort_key = lambda x: (-1 * x[1], x[0])
159 if by_key:
160 sort_key = lambda x: x[0]
161 return sorted(key_counts.items(), key=sort_key)
52def count (self):
53 return (self.__payload.count() * len(self.__encoders)) if self.__encoders else self.__payload.count()

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