Python: Lỗi khi "import matplotlib"

Mình mới học python còn gà mờ.
Mình gặp lỗi khi gõ dòng code trên sumlime text:

import numpy as np 
import cv2
import matplotlib.pyplot as plt
cv2.waitKey(0)             
cv2.destroyAllWindows

thì xuất hiện lỗi là:

Traceback (most recent call last):    from matplotlib.figure import Figure, figaspect
  File "C:Python27libsite-packagesmatplotlibfigure.py", line 36, in <module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "C:Python27libsite-packagesmatplotlibaxes\__init__.py", line 4, in <module>
    from ._subplots import *
  File "C:Python27libsite-packagesmatplotlibaxes\_subplots.py", line 10, in <module>
    from matplotlib.axes._axes import Axes
  File "C:Python27libsite-packagesmatplotlibaxes\_axes.py", line 17, in <module>
    from matplotlib.cbook import _string_to_bool, mplDeprecation
ImportError: cannot import name _string_to_bool
[Finished in 0.5s]

Mình có search gg là thiếu Six, và mình cũng đã install rồi (pip install six
và kết quả trả về là: requirement already satisfied: six in c:python27libsite-pakages)
Nhưng vẫn không hết lỗi.

mình import riêng:
import matplotlib
thôi thì vẫn ok.

Mình cũng thử 1 code đó lên Spyder thì lỗi hiện lên khác:

Traceback (most recent call last):
File “C:Python27libsite-packagesIPythoncoreinteractiveshell.py”, line 2894, in run_code
self.showtraceback()
File “C:Python27libsite-packagesIPythoncoreinteractiveshell.py”, line 1756, in showtraceback
value, tb, tb_offset=tb_offset)
File “C:Python27libsite-packagesIPythoncoreultratb.py”, line 1190, in structured_traceback
self, etype, value, tb, tb_offset, context)
File “C:Python27libsite-packagesIPythoncoreultratb.py”, line 1107, in structured_traceback
self, etype, value, elist, tb_offset, context
File “C:Python27libsite-packagesIPythoncoreultratb.py”, line 501, in structured_traceback
out_list.extend(self._format_list(elist))
File “C:Python27libsite-packagesIPythoncoreultratb.py”, line 537, in _format_list
Colors.name, name, Colors.Normal)
UnicodeDecodeError: ‘ascii’ codec can’t decode byte 0xe3 in position 26: ordinal not in range(128)

Ai biết bày mình với. cám ơn ạ.