How to use 'python count occurrences of all items in list' in Python

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def _count(elem: object, ls, index: int) -> int:
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    if index < len(ls):
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        if ls[index] == elem:
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            return 1 + _count(elem, ls, index + 1)
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        else:
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            return _count(elem, ls, index + 1)
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    return 0

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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()