Version 0.29.0

Slice support in iloc

We improved iloc indexer to support slice as row selection. (#1335)

For example,

>>> kdf = ks.DataFrame({'a':list('abcdefghij')})
>>> kdf
   a
0  a
1  b
2  c
3  d
4  e
5  f
6  g
7  h
8  i
9  j
>>> kdf.iloc[2:5]
   a
2  c
3  d
4  e
>>> kdf.iloc[2:-3:2]
   a
2  c
4  e
6  g
>>> kdf.iloc[5:]
   a
5  f
6  g
7  h
8  i
9  j
>>> kdf.iloc[5:2]
Empty DataFrame
Columns: [a]
Index: []

Documentation

We added links to the previous talks in our document. (#1319)

You can see a lot of useful talks from the previous events and we will keep updated.

https://koalas.readthedocs.io/en/latest/getting_started/videos.html

Other new features and improvements

We added the following new feature:

DataFrame:

• stack (#1329)

Series:

• repeat (#1328)

Index:

• difference (#1325)
• repeat (#1328)

MultiIndex:

• difference (#1325)
• repeat (#1328)

Other improvements

• DataFrame.pivot should preserve the original index names. (#1316)
• Fix _LocIndexerLike to handle a Series from index. (#1315)
• Support MultiIndex in DataFrame.unstack. (#1322)
• Support Spark UDT when converting from/to pandas DataFrame/Series. (#1324)
• Allow negative numbers for head. (#1330)
• Return a Koalas series instead of pandas' in stats APIs at Koalas DataFrame (#1333)