以下代码有效,并且在粘贴到Jupyter Notebook或QT控制台中时会产生预期的条形图:
%matplotlib inline
import pandas as pd
import matplotlib.pyplot as plt
# Create some data to plot
df = pd.DataFrame(
dict(Feature1=[10, 20, 30, 20, 10], Feature2=[3, 2, 3, 2, 3]),
index=['a', 'b', 'c', 'd', 'e']
)
_ = df.plot(kind='bar', legend=False, y='Feature1', yerr='Feature2', rot=0)
但是,一旦我尝试提供一个自定义的Axes
实例(以便将该图放置在我想要的位置),它将引发错误。 在上面的示例之后运行以下代码将引发错误:
fig = plt.figure(0)
ax = fig.add_subplot(111)
_ = df.plot(kind='bar', legend=False, y='Feature1', yerr='Feature2', rot=0, axes=ax)
这是回溯:
Traceback (most recent call last):
File "<stdin>", line 12, in <module>
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 3740, in __call__
sort_columns=sort_columns, **kwds)
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 2614, in plot_frame
**kwds)
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 2441, in _plot
plot_obj.generate()
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 1028, in generate
self._make_plot()
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 1971, in _make_plot
log=self.log, **kwds)
File "/usr/local/miniconda3/lib/python3.5/site-packages/pandas/tools/plotting.py", line 1918, in _plot
return ax.bar(x, y, w, bottom=start, log=log, **kwds)
File "/usr/local/miniconda3/lib/python3.5/site-packages/matplotlib/__init__.py", line 1812, in inner
return func(ax, *args, **kwargs)
File "/usr/local/miniconda3/lib/python3.5/site-packages/matplotlib/axes/_axes.py", line 2134, in bar
self.add_patch(r)
File "/usr/local/miniconda3/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 1780, in add_patch
self._set_artist_props(p)
File "/usr/local/miniconda3/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 865, in _set_artist_props
a.axes = self
File "/usr/local/miniconda3/lib/python3.5/site-packages/matplotlib/artist.py", line 237, in axes
raise ValueError("Can not reset the axes. You are "
ValueError: Can not reset the axes. You are probably trying to re-use an artist in more than one Axes which is not supported
在此示例中,我希望第二个图与第一个图相同。
pd.show_versions()
INSTALLED VERSIONS
------------------
commit: None
python: 3.5.2.final.0
python-bits: 64
OS: Linux
OS-release: 4.4.6-gentoo
machine: x86_64
processor: Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz
byteorder: little
LC_ALL: None
LANG: en_US.utf8
pandas: 0.18.1
nose: 1.3.7
pip: 8.1.2
setuptools: 25.1.6
Cython: None
numpy: 1.11.1
scipy: 0.18.0
statsmodels: 0.6.1
xarray: None
IPython: 5.1.0
sphinx: 1.4.1
patsy: 0.4.1
dateutil: 2.5.3
pytz: 2016.6.1
blosc: None
bottleneck: None
tables: 3.2.3.1
numexpr: 2.6.1
matplotlib: 1.5.1
openpyxl: None
xlrd: 1.0.0
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: 1.0.13
pymysql: None
psycopg2: 2.6.1 (dt dec pq3 ext)
jinja2: 2.8
boto: None
pandas_datareader: None
(FWIW,我刚刚构建并尝试了最新版本的熊猫,并得到了相同的行为:
pandas: 0.18.1+391.g6645b2b
)
您要使用ax=ax
,而不是axes
。
不幸的是,我认为我们无法采取很多措施来捕获此类错误。 我们在.plot
方法中接受**kwargs
,并将它们传递给基础的matplotlib方法(例如.ax.bar
)。 我不太确定为什么matplotlib axes.bar
接受axes
关键字,大概是为了与pylab接口兼容?
我现在要关闭它; 我们可能会接受axes
作为ax
的别名(不知道为什么最初选择ax
),但是我要暂时搁置,看看是否还有更多人在跑到这个。
阿克谢谢!
最有用的评论
您要使用
ax=ax
,而不是axes
。不幸的是,我认为我们无法采取很多措施来捕获此类错误。 我们在
.plot
方法中接受**kwargs
,并将它们传递给基础的matplotlib方法(例如.ax.bar
)。 我不太确定为什么matplotlibaxes.bar
接受axes
关键字,大概是为了与pylab接口兼容?