# Dummy df.
data = [
[11, 'a'],
[11, 'b'],
[10, 'c'],
[9, 'd'],
[1, 'e'],
[1, 'f']
]
column_name = ['freq', 'recordings']
df = pd.DataFrame(data, columns=column_name)
打印df
:
freq id
11 a
11 b
10 c
9 d
1 e
1 f
我想看看freq
的每个值存储了多少次。期望输出:
df =
freq recordings
11 2
10 1
9 1
1 2
解决方案:
输出:
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