How to use 'python get frequency of items in list' in Python

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231def items_by_frequency(freqdist):
232 """Sort a dictionary by frequency. Return as a list of pairs.
233 """
234 frequency = lambda x: x[1]
235 return sorted(iter(list(freqdist.items())), key=frequency, reverse=True)
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19def freq_counter(lst):
20 c = Counter()
21
22 for i in lst:
23 c[i] += 1
24
25 return c

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