How to duplicate rows based on a counter column

Question

Let\'s say I have a data frame called df

x count 
d 2
e 3
f 2

Count would be the counter column and the # times I want it to repeat.

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Answer 1

You could use .loc with repeat like

In [295]: df.loc[df.index.repeat(df['count'])].reset_index(drop=True)
Out[295]:
   x  count
0  d      2
1  d      2
2  e      3
3  e      3
4  e      3
5  f      2
6  f      2

Or, using pd.Series.repeat you can

In [278]: df.set_index('x')['count'].repeat(df['count']).reset_index()
Out[278]:
   x  count
0  d      2
1  d      2
2  e      3
3  e      3
4  e      3
5  f      2
6  f      2