from collections import Counter
Counter(a)
a = [9, 9, 3, 1, 1, 2]
result = Counter(a)
print(result)
或者
for x in a:
if a.count(x)>1:
print(x)
#
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from collections import Counter
Counter(a)
a = [9, 9, 3, 1, 1, 2]
result = Counter(a)
print(result)
或者
for x in a:
if a.count(x)>1:
print(x)
#