相关代码：hist.render_to_file('1.svg')
这张图片显示了细节
我尝试安装新版本的lxml，但无法工作；
我安装它的过程是这样的：
apt-get install libxml2-dev libxslt-dev python-dev
pip install lxml
谁能告诉我如何解决它？
谢谢！
后来我按照评论说的那样尝试解决它，这就是结果。
怎么升级？我升级失败了...
davenny@davenny-X555LF:~$ pip install --upgrade pygal
Collecting pygal
Downloading pygal-2.4.0-py2.py3-none-any.whl (127kB)
100% |████████████████████████████████| 133kB 38kB/s
Installing collected packages: pygal
Found existing installation: pygal 1.7.0
Uninstalling pygal-1.7.0:
Successfully uninstalled pygal-1.7.0
Rolling back uninstall of pygal
Exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/local/lib/python3.5/dist-packages/pip/commands/install.py", line 342, in run
prefix=options.prefix_path,
File "/usr/local/lib/python3.5/dist-packages/pip/req/req_set.py", line 784, in install
**kwargs
File "/usr/local/lib/python3.5/dist-packages/pip/req/req_install.py", line 851, in install
self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
File "/usr/local/lib/python3.5/dist-packages/pip/req/req_install.py", line 1064, in move_wheel_files
isolated=self.isolated,
File "/usr/local/lib/python3.5/dist-packages/pip/wheel.py", line 345, in move_wheel_files
clobber(source, lib_dir, True)
File "/usr/local/lib/python3.5/dist-packages/pip/wheel.py", line 316, in clobber
ensure_dir(destdir)
File "/usr/local/lib/python3.5/dist-packages/pip/utils/__init__.py", line 83, in ensure_dir
os.makedirs(path)
File "/usr/lib/python3.5/os.py", line 241, in makedirs
mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/usr/local/lib/python3.5/dist-packages/pygal-2.4.0.dist-info'
davenny@davenny-X555LF:~$ pip list --outdated
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
matplotlib (1.5.2rc2) - Latest: 2.0.2 [wheel]
pygal (1.7.0) - Latest: 2.4.0 [wheel]
python-dateutil (2.4.2) - Latest: 2.6.1 [wheel]