Python pygal ValueError:无效的PI名称'；b'；xml''；

相关代码：hist.render\u to\u文件（'1.svg'）

这张图片显示了细节

我试图安装新版本的lxml，但无法工作

我安装它的过程如下所示：

apt-get install libxml2-dev libxslt-dev python-dev
pip install lxml

有人能告诉我怎么解决吗

谢谢大家!

后来我试着解决这个问题，正如国会所说，这就是结果

如何升级？升级失败。。。

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尝试运行

pip安装--升级pygal

。如果没有帮助，请使用

pip list--oplated

或

pip list

检查已安装的版本（pygal版本应至少为2.0.11）。编辑您的帖子并将输出作为文本包含（使用Ctrl+Shift+C从终端复制）。@tom我再次编辑了它，您能帮我吗？@tom我已经解决了它！非常感谢你！我通过以下方式解决了这个问题：pip安装——用户pygal==2.4Try运行

pip安装——升级pygal

。如果没有帮助，请使用

pip list--oplated

或

pip list

检查已安装的版本（pygal版本应至少为2.0.11）。编辑您的帖子并将输出作为文本包含（使用Ctrl+Shift+C从终端复制）。@tom我再次编辑了它，您能帮我吗？@tom我已经解决了它！非常感谢你！我通过以下方式解决了这个问题：pip安装--user pygal==2.4

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davenny@davenny-X555LF:~$ pip list --outdated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]