find unique elements in pandas and their connection with other column
df = pd.DataFrame({'author':['a', 'a', 'b'], 'subreddit':['sr1', 'sr2', 'sr2']})
>>> df
author subreddit
0 a sr1
1 a sr2
2 b sr2
...find unique elements in pandas and their connection with other column
df = pd.DataFrame({'author':['a', 'a', 'b'], 'subreddit':['sr1', 'sr2', 'sr2']})
>>> df
author subreddit
0 a sr1
1 a sr2
2 b sr2
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