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Better error message for DataFrame.hist() without numerical columns (… #26483

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Merged
merged 4 commits into from
May 24, 2019
Merged

Better error message for DataFrame.hist() without numerical columns (… #26483

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576f0a8
Better error message for DataFrame.hist() without numerical columns (…
matsmaiwald May 21, 2019
99da02e
Better error message for DataFrame.hist() without numerical columns (…
matsmaiwald May 21, 2019
d25bbc2
Update pandas/tests/plotting/test_hist_method.py
matsmaiwald May 21, 2019
91ab6d8
Update pandas/tests/plotting/test_hist_method.py
matsmaiwald May 21, 2019
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4 changes: 4 additions & 0 deletions pandas/plotting/_core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2426,6 +2426,10 @@ def hist_frame(data, column=None, by=None, grid=True, xlabelsize=None,
data = data._get_numeric_data()
naxes = len(data.columns)

if naxes == 0:
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Suggested change
if naxes == 0:
if not naxes:

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I prefer how it is. This is more explicit.

raise ValueError("hist method requires numerical columns, "
"nothing to plot.")

fig, axes = _subplots(naxes=naxes, ax=ax, squeeze=False,
sharex=sharex, sharey=sharey, figsize=figsize,
layout=layout)
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10 changes: 10 additions & 0 deletions pandas/tests/plotting/test_hist_method.py
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Expand Up @@ -209,6 +209,16 @@ def test_hist_df_legacy(self):
with pytest.raises(AttributeError):
ser.hist(foo='bar')

@pytest.mark.slow
def test_hist_non_numerical_raises(self):
# gh-10444
df = DataFrame(np.random.rand(10, 2))
df_o = df.astype(np.object)

msg = "hist method requires numerical columns, nothing to plot."
with pytest.raises(ValueError, match=msg):
df_o.hist()

@pytest.mark.slow
def test_hist_layout(self):
df = DataFrame(randn(100, 3))
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