ImportError: No module named rosdep2.main

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Trying to install ros kinetic according to the official guide .

But always fails.

The first problem is described here. So I deleted all files and key related to ros, and reinstalled again.

Here is the error that occurs now:

$ sudo rosdep init
Traceback (most recent call last):
  File "/usr/bin/rosdep", line 3, in <module>
    from rosdep2.main import rosdep_main
ImportError: No module named rosdep2.main

Anyone can figure it out? Thanks.