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agg method with list of functions does not work with axis=1 #16679

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lafras opened this issue Jun 12, 2017 · 3 comments

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@lafras
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commented Jun 12, 2017

Code Sample

import numpy
import pandas

numpy.random.seed(1234)

frame = pandas.DataFrame(
    data=numpy.random.random((5, 3))
)
print(
    frame
)
# Works
print(
    frame.agg(['mean', 'std'])
)
# Expected output
print(
    frame.transpose().agg(['mean', 'std']).transpose()
)
# Does not work as expected
print(
    frame.agg(['mean', 'std'], axis=1)
)

Problem description

Calling the agg method on a frame with axis=1 raises a TypeError:

Traceback (most recent call last):
  File "/home/lafras/tmp/buggy.py", line 13, in <module>
    frame.agg(['mean', 'std'], axis=1)
  File "/home/lafras/.local/lib/python3.5/site-packages/pandas/core/frame.py", line 4154, in aggregate
    return self.apply(func, axis=axis, args=args, **kwargs)
  File "/home/lafras/.local/lib/python3.5/site-packages/pandas/core/frame.py", line 4262, in apply
    ignore_failures=ignore_failures)
  File "/home/lafras/.local/lib/python3.5/site-packages/pandas/core/frame.py", line 4358, in _apply_standard
    results[i] = func(v)
TypeError: ("'list' object is not callable", 'occurred at index 0')

Expected Output

frame.agg(['mean', 'std'], axis=1) should produce this:

       mean       std
0  0.417119  0.216033
1  0.612642  0.294504
2  0.678825  0.357107
3  0.578248  0.267557
4  0.588805  0.189838

Output of pd.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.5.2.final.0 python-bits: 64 OS: Linux OS-release: 4.4.0-79-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_ZA.UTF-8 LOCALE: en_ZA.UTF-8

pandas: 0.20.2
pytest: 3.0.4
pip: 9.0.1
setuptools: 36.0.1
Cython: 0.25.2
numpy: 1.13.0
scipy: 0.19.0
xarray: 0.8.2
IPython: 6.1.0
sphinx: None
patsy: 0.4.1
dateutil: 2.6.0
pytz: 2017.2
blosc: None
bottleneck: None
tables: 3.3.0
numexpr: 2.6.1
feather: None
matplotlib: 2.0.0
openpyxl: None
xlrd: 1.0.0
xlwt: None
xlsxwriter: None
lxml: None
bs4: 4.4.1
html5lib: 0.9999999
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.9.5
s3fs: 0.0.7
pandas_gbq: None
pandas_datareader: 0.2.1

@jreback

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commented Jun 12, 2017

yeah looks like an under tested case. welcome for you to have a debugging look.

@jreback jreback added this to the Next Major Release milestone Jun 12, 2017

@spencerogden

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commented Feb 7, 2018

Confirming that as of version 0.22.0 this issue still exists. A work around is to do: frame.T.agg([list_of_func]).T

@jreback

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commented Feb 8, 2018

@spencerogden hence the 'open' tag. PR's to fix are welcome.

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