OPCUAclient无法打开

Question

我试图在ubuntu 14.04.6上打开opcua客户端，但我发现以下错误：

cryptography is not installed, use of crypto disabled

cryptography is not installed, use of crypto disabled

cryptography is not installed, use of crypto disabled

pyqtgraph or numpy are not installed, use of graph feature disabled

Traceback (most recent call last):

  File "/usr/local/bin/opcua-client", line 9, in <module>

    load_entry_point('opcua-client==0.8.0', 'console_scripts', 'opcua-client')()

  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 351, in load_entry_point

    return get_distribution(dist).load_entry_point(group, name)

  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2363, in load_entry_point

    return ep.load()

  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2088, in load

    entry = __import__(self.module_name, globals(),globals(), ['__name__'])

  File "/usr/local/lib/python3.4/dist-packages/uaclient/mainwindow.py", line 23, in <module>

    from uawidgets.attrs_widget import AttrsWidget

  File "/usr/local/lib/python3.4/dist-packages/uawidgets/attrs_widget.py", line 11, in <module>

    from uawidgets.get_node_dialog import GetNodeButton

  File "/usr/local/lib/python3.4/dist-packages/uawidgets/get_node_dialog.py", line 7, in <module>

    from uawidgets.tree_widget import TreeWidget

  File "/usr/local/lib/python3.4/dist-packages/uawidgets/tree_widget.py", line 62

    raise ValueError(f"Node {node} not found in tree")

                                                    ^
SyntaxError: invalid syntax

我已经下载了pip的所有依赖项。有人知道该怎么处理这个问题吗？你知道吗

Answer 1

从错误跟踪来看，您似乎使用的是python3.4，但是raise ValueError使用的是从python3.6开始就支持的f-Strings格式。你知道吗

尝试升级python版本。你知道吗