【发布时间】：2021-03-11 11:44:14
【问题描述】：
我在这个简单的程序中使用这个 python pandas & dataframe_image 包。我正在尝试将数据帧输出（df）导出到 PNG 文件。但是在 docker 容器中出现此错误。但它在机器上工作。
谁能帮我解决这个问题？
>>> import numpy as np
>>> import pandas as pd
>>> df = pd.DataFrame(np.random.rand(6,4))
>>> print(df)
0 1 2 3
0 0.330808 0.781473 0.932547 0.440994
1 0.777121 0.101482 0.451317 0.020650
2 0.615397 0.973937 0.518510 0.454620
3 0.636042 0.009769 0.983006 0.618849
4 0.021588 0.276602 0.811048 0.928457
5 0.892482 0.355014 0.050483 0.275732
>>> import dataframe_image as dfi
>>> dfi.export(df, 'df_styled.png')
/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_CA.UTF-8)
[1129/005716.614490:ERROR:bus.cc(393)] Failed to connect to the bus: Failed to connect to socket /var/run/dbus/system_bus_socket: Connection refused
[1129/005716.834742:INFO:headless_shell.cc(616)] Written to file /tmp/tmprz2n4mrq/temp.png.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.9/site-packages/dataframe_image/_pandas_accessor.py", line 24, in export
return _export(obj, filename, fontsize, max_rows, max_cols, table_conversion, chrome_path)
File "/usr/local/lib/python3.9/site-packages/dataframe_image/_pandas_accessor.py", line 73, in _export
img_str = converter(html)
File "/usr/local/lib/python3.9/site-packages/dataframe_image/_screenshot.py", line 168, in run
img_str = self.finalize_image(img)
File "/usr/local/lib/python3.9/site-packages/dataframe_image/_screenshot.py", line 159, in finalize_image
mimage.imsave(buffer, img)
File "/usr/local/lib/python3.9/site-packages/matplotlib/image.py", line 1577, in imsave
rgba = sm.to_rgba(arr, bytes=True)
File "/usr/local/lib/python3.9/site-packages/matplotlib/cm.py", line 313, in to_rgba
if norm and (xx.max() > 1 or xx.min() < 0):
File "/usr/local/lib/python3.9/site-packages/numpy/core/_methods.py", line 39, in _amax
return umr_maximum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation maximum which has no identity
DBus 正在虚拟机上运行。现在出现以下错误。
/etc/init.d/dbus status
● dbus.service - D-Bus System Message Bus
Loaded: loaded (/lib/systemd/system/dbus.service; static; vendor preset: enabled)
Active: active (running) since Mon 2020-11-30 01:43:57 UTC; 57s ago
Docs: man:dbus-daemon(1)
Main PID: 957 (dbus-daemon)
Tasks: 1 (limit: 4915)
CGroup: /system.slice/dbus.service
└─957 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
>>> import numpy as np
>>> import dataframe_image as dfi
>>> import pandas as pd
>>> df = pd.DataFrame(np.random.rand(6,4))
>>> dfi.export(df, '/home/nr/testing/df_styled.png')
[1130/014613.802954:INFO:headless_shell.cc(616)] Written to file /tmp/tmp33yqzne1/temp.png.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.6/dist-packages/dataframe_image/_pandas_accessor.py", line 24, in export
return _export(obj, filename, fontsize, max_rows, max_cols, table_conversion, chrome_path)
File "/usr/local/lib/python3.6/dist-packages/dataframe_image/_pandas_accessor.py", line 73, in _export
img_str = converter(html)
File "/usr/local/lib/python3.6/dist-packages/dataframe_image/_screenshot.py", line 168, in run
img_str = self.finalize_image(img)
File "/usr/local/lib/python3.6/dist-packages/dataframe_image/_screenshot.py", line 159, in finalize_image
mimage.imsave(buffer, img)
File "/usr/local/lib/python3.6/dist-packages/matplotlib/image.py", line 1577, in imsave
rgba = sm.to_rgba(arr, bytes=True)
File "/usr/local/lib/python3.6/dist-packages/matplotlib/cm.py", line 313, in to_rgba
if norm and (xx.max() > 1 or xx.min() < 0):
File "/usr/local/lib/python3.6/dist-packages/numpy/core/_methods.py", line 39, in _amax
return umr_maximum(a, axis, None, out, keepdims, initial, where)
ValueError: zero-size array to reduction operation maximum which has no identity
>>>
【问题讨论】：