/TypeScript/Find unique elements in pandas and their connection with other column

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
...

Source: stackoverflow.com

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