[英]Generating 2-by-2 tuples from list and finding the duplicated tuples in python
I am a beginner in Python and I am having trouble generating and identifying duplicates on tuples on my dataFrame.我是 Python 的初学者,在我的 dataFrame 上的元组上生成和识别重复项时遇到问题。
First I have this list of userid:首先我有这个用户ID列表:
'userid': ["us1", "us2", "us1", "us2", "us4", "us4", "us5", "us1", "us2"]
And I want to generate 2-by-2 tuples at the order the userid are in the list, so it would be:我想按照用户 ID 在列表中的顺序生成 2×2 元组,所以它是:
[('us1', 'us2'),
('us2', 'us1'),
('us1', 'us2'),
('us2', 'us4'),
('us4', 'us4'),
('us4', 'us5'),
('us5', 'us1'),
('us1', 'us2')]
But the tuples I arrive are this ones (and I don't understand why):但是我到达的元组是这个(我不明白为什么):
[('us1', 'us2'),
('us2', 'us1'),
('us1', 'us4'),
('us4', 'us2'),
('us2', 'us5'),
('us5', 'us4'),
('us4', 'us1'),
('us1', 'us2')]
Here is my code:这是我的代码:
d = {'id': ["a", "a", "a", "a", "a", "a", "a", "a", "a"], 'id2': ["b", "b", "b", "b", "b", "b", "b", "b", "b"], 'userid': ["us1", "us2", "us1", "us2", "us4", "us4", "us5", "us1", "us2"], "time": [1, 2, 3, 5, 4, 7, 6, 8, 9]}
df_test = pd.DataFrame(data=d).sort_values('time')
df_test.groupby(['id','id2']).agg(lambda x: x.tolist()).reset_index()
test2 = list(zip(df_test.userid[:-1], df_test.userid[1:]))
zipped_list = test2[:]
list(test2)
-> In addition, my next step will be finding duplicates on this tuples and extracting them for a new list, so in the case of the tuple: -> 此外,我的下一步将是在此元组上查找重复项并将它们提取为一个新列表,因此对于元组:
[('us1', 'us2'),
('us2', 'us1'),
('us1', 'us2'),
('us2', 'us4'),
('us4', 'us4'),
('us4', 'us5'),
('us5', 'us1'),
('us1', 'us2')]
Should be the list [('us1', 'us2'), 3]
because is the only tuple that appears duplicated and the '3' is to say that appears 3 times this duplication.应该是列表
[('us1', 'us2'), 3]
因为它是唯一出现重复的元组,而 '3' 就是说出现了 3 次重复。
Therefore I cannot find my error on generating the tuples on the order I want nor having any idea on how to find the duplicates.因此,我找不到按我想要的顺序生成元组的错误,也不知道如何找到重复项。
Let us do frozenset
+ value_counts
让我们做
frozenset
+ value_counts
pd.Series(list(map(frozenset,zipped_list))).value_counts()
(us2, us1) 3
(us1, us4) 2
(us2, us5) 1
(us5, us4) 1
(us2, us4) 1
dtype: int64
If only need the list reorder如果只需要列表重新排序
l=list(map(frozenset,zipped_list))
Or we can do numpy
或者我们可以做
numpy
np.sort(zipped_list,axis=1).tolist()
[['us1', 'us2'], ['us1', 'us2'], ['us1', 'us4'], ['us2', 'us4'], ['us2', 'us5'], ['us4', 'us5'], ['us1', 'us4'], ['us1', 'us2']]
Update: you sort_values
first, so we need sort_index
back更新:你先
sort_values
,所以我们需要sort_index
list(zip(df_test.userid[:-1].sort_index(), df_test.userid[1:].sort_index()))
[('us1', 'us2'), ('us2', 'us1'), ('us1', 'us2'), ('us2', 'us4'), ('us4', 'us4'), ('us4', 'us5'), ('us5', 'us1'), ('us1', 'us2')]
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