关于ubuntu下使用matplotlib画图的问题

Question

首先，

import tkinter

然后报错如下：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'tkinter'

但是我已经sudo apt-get install python3-tk了啊
为什么还是找不到模块。目前用的python3
然后我在matplotlib下画图，也是报这个错。

import matplotlib.pyplot as plt

报错如下：

 import matplotlib.pyplot as plt
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/pyplot.py", line 115, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backends/__init__.py", line 62, in pylab_setup
    [backend_name], 0)
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backends/backend_tkagg.py", line 4, in <module>
    from . import tkagg  # Paint image to Tk photo blitter extension.
  File "/usr/local/lib/python3.6/dist-packages/matplotlib/backends/tkagg.py", line 5, in <module>
    from six.moves import tkinter as Tk
  File "/usr/lib/python3/dist-packages/six.py", line 92, in __get__
    result = self._resolve()
  File "/usr/lib/python3/dist-packages/six.py", line 115, in _resolve
    return _import_module(self.mod)
  File "/usr/lib/python3/dist-packages/six.py", line 82, in _import_module
    __import__(name)
ModuleNotFoundError: No module named 'tkinter'

总之就是找不到tkinter，我也装了tkinter，而且什么tcl/tk也装了，就是找不到，求解决，浪费了很久时间了。

我早已用apt-get install python3-tk，但是还是找不到tkinter

Answer 1

pip install tkinter

Answer 2

sudo apt-get install python3.6-tk