BUG: hist raises TypeError when df contains non numeric column

[sinhrks]

DataFrame.hist without by keyword raises TypeError when it contains non-numeric column.

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import pandas.util.testing as tm

n=100
gender = tm.choice(['Male', 'Female'], size=n)
classroom = tm.choice(['A', 'B', 'C'], size=n)
single = tm.choice(['S'], size=n)

df = pd.DataFrame({'gender': gender,
                   'classroom': classroom,
                   'height': np.random.normal(66, 4, size=n),
                   'weight': np.random.normal(161, 32, size=n),
                   'category': np.random.randint(4, size=n)})

df.hist(by='gender')
# This works, even though 'classroom' (str) column in still contained

df.hist()
# TypeError: cannot concatenate 'str' and 'float' objects

[jreback]

@TomAugspurger ok by you?

[TomAugspurger]

Merged via fa0f78f

Thanks.

[jreback]

@TomAugspurger I just uploaded mac osx wheels to PyPi. Can you try to install and see if it works?

[TomAugspurger]

Tested on 2.7 and 3.3. Both of those worked.

[jreback]

excellent!

[TomAugspurger]

This build failed on Travis, but the failure seems to be unrelated. I restarted the build.

[sinhrks]

@TomAugspurger @jreback Thanks to merge. The failure seems to be caused by unrelated part. I've created a issue #7289.