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

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def count_value(lst, key):
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    d = {}
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    for obj in lst:
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        val = obj[key]
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        if val in d:
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            d[val] = d[val] + 1
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        else:
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            d[val] = 1
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    return d.iteritems()

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def increment_count(count_dict, key, n=1):
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    """
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        Puts the key in the dictionary if does not exist or adds one if it does.
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        Args:
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            count_dict: a dictionary mapping a string to an integer
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            key: a string
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    """
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    if key in count_dict:
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        count_dict[key] += n
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    else:
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        count_dict[key] = n

154
def sort_dict(key_counts, by_key=False):
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    '''Accept a dict of key:values (numerics) returning list of key-value tuples ordered by desc values.
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    If by_key=True, sorts by dict key.'''
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    sort_key = lambda x: (-1 * x[1], x[0])
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    if by_key:
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        sort_key = lambda x: x[0]
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    return sorted(key_counts.items(), key=sort_key)

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def count (self):
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    return (self.__payload.count() * len(self.__encoders)) if self.__encoders else self.__payload.count()