Traceback (most recent call last): File "/usr/bin/rosdep", line 11, in <module> load_entry_point('rosdep==0.22.2', 'console_scripts', 'rosdep')() File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 480, in load_entry_point return get_distribution(dist).load_entry_point(group, name) File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2693, in load_entry_point return ep.load() File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2324, in load return self.resolve() File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2330, in resolve module = __import__(self.module_name, fromlist=['__name__'], level=0) File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 72 DEFAULT_SOURCES_LIST_URL = 'https://ghproxy.com/raw.githubusercontent.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list' ^ SyntaxError: invalid syntax

这个错误显示在运行 `rosdep` 命令时出现了语法错误。具体来说，它指出在 `rosdep2/main.py` 文件的第72行中有一个语法错误，即 `DEFAULT_SOURCES_LIST_URL` 变量的定义存在问题。可能是这个变量的字符串格式不正确或者缺少某些引号等。

建议检查该变量的定义，并确保其语法正确。如果需要，可以检查该文件的其他部分，以确定是否存在其他语法错误。