1.bug提示AttributeError: module ‘yaml’ has no attribute ‘CSafeLoader’

用netplan网络配置工具配置以太网IP的时候，出现bug
Traceback (most recent call last):
File “/usr/sbin/netplan”, line 23, in
netplan.main()
File “/usr/share/netplan/netplan/cli/core.py”, line 50, in main
self.run_command()
File “/usr/share/netplan/netplan/cli/utils.py”, line 186, in run_command
self.func()
File “/usr/share/netplan/netplan/cli/commands/try_command.py”, line 66, in run
self.run_command()
File “/usr/share/netplan/netplan/cli/utils.py”, line 186, in run_command
self.func()
File “/usr/share/netplan/netplan/cli/commands/try_command.py”, line 69, in command_try
if not self.is_revertable():
File “/usr/share/netplan/netplan/cli/commands/try_command.py”, line 152, in is_revertable
self.config_manager.parse(extra_config=extra_config)
File “/usr/share/netplan/netplan/configmanager.py”, line 111, in parse
self._merge_yaml_config(yaml_file)
File “/usr/share/netplan/netplan/configmanager.py”, line 196, in _merge_yaml_config
yaml_data = yaml.load(f, Loader=yaml.CSafeLoader)
AttributeError: module ‘yaml’ has no attribute ‘CSafeLoader’
运行netplan try时出现上述错误

2.debug方法

找到netplan的config文件，根据提示可以知道/usr/share/netplan/netplan/configmanager.py在这里
然后定位到196行，将yaml.CSafeLoader改为yaml.SafeLoader，bug解决。

3.方法来源

解决办法是在https://www.nuomiphp.com/eplan/375147.html这里找到的，提到yaml.SafeLoader用法，所以就尝试的修改了。
没仔细研究过netplan的代码，猜测是由于之前配置代码环境时更改了yaml版本导致此问题。