/matplotlib/dates.py 发生的错误："Can't create weekday with n == 0"

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错误

Traceback (most recent call last):  File "demo_showcandidates.py", line 9, in <module>    import skimage.io  File "/usr/local/lib/python3.4/dist-packages/skimage/io/__init__.py", line 15, in <module>    reset_plugins()  File "/usr/local/lib/python3.4/dist-packages/skimage/io/manage_plugins.py", line 93, in reset_plugins    _load_preferred_plugins()  File "/usr/local/lib/python3.4/dist-packages/skimage/io/manage_plugins.py", line 73, in _load_preferred_plugins    _set_plugin(p_type, preferred_plugins['all'])  File "/usr/local/lib/python3.4/dist-packages/skimage/io/manage_plugins.py", line 85, in _set_plugin    use_plugin(plugin, kind=plugin_type)  File "/usr/local/lib/python3.4/dist-packages/skimage/io/manage_plugins.py", line 255, in use_plugin    _load(name)  File "/usr/local/lib/python3.4/dist-packages/skimage/io/manage_plugins.py", line 299, in _load    fromlist=[modname])  File "/usr/local/lib/python3.4/dist-packages/skimage/io/_plugins/matplotlib_plugin.py", line 3, in <module>    import matplotlib.pyplot as plt  File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 37, in <module>    from matplotlib.figure import Figure, figaspect  File "/usr/local/lib/python3.4/dist-packages/matplotlib/figure.py", line 40, in <module>    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory  File "/usr/local/lib/python3.4/dist-packages/matplotlib/axes/__init__.py", line 4, in <module>    from ._subplots import *  File "/usr/local/lib/python3.4/dist-packages/matplotlib/axes/_subplots.py", line 10, in <module>    from matplotlib.axes._axes import Axes  File "/usr/local/lib/python3.4/dist-packages/matplotlib/axes/_axes.py", line 24, in <module>    import matplotlib.dates as _  # <-registers a date unit converter  File "/usr/local/lib/python3.4/dist-packages/matplotlib/dates.py", line 125, in <module>    from dateutil.rrule import (rrule, MO, TU, WE, TH, FR, SA, SU, YEARLY,  File "/usr/local/lib/python3.4/dist-packages/dateutil/rrule.py", line 55    raise ValueError, "Can't create weekday with n == 0"                    ^SyntaxError: invalid syntax

解决

输入下面命令

sudo pip3 install --upgrade python-util

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