[ARROW-736] [Python] Mixed-type object DataFrame columns should not silently coerce to an Arrow type by default

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.3.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/16353
• Assignee: Phillip Cloud
• Reporter: Wes McKinney
• Created: 29/Mar/17 19:45
• Updated: 11/Jan/23 07:10
• Resolved: 01/Apr/17 04:00

Description

In [4]: df = pd.DataFrame({'a': ['a', 1, 2.0]})

In [5]: df
Out[5]: 
   a
0  a
1  1
2  2

In [6]: pt = pa.Table.from_pandas(df)

In [7]: pt.to_pandas()
Out[7]: 
      a
0     a
1  None
2  None

Issue Links

• blocks: ARROW-670 Arrow 0.3 release