matplotlib错误：从检查导入参数ImportError：无法导入名称“ Parameter”

Question

我刚刚使用Anaconda安装了matplotlib，因为我需要绘制图形。我刚导入它，然后我写了：

import matplotlib.pyplot as plt
fig = plt.figure()
fig.suptitle("Error rates / tree depth")
fig, ax_lst = plt.subplots(2,2)

当我运行文件时，它说：

Traceback (most recent call last):
  File "/Users/xxxxxxxx/Documents/xxxxxxx/ASSIGNMENTS/hw2/handout/decisionTree_working_not_cleaned.py", line 5, in <module>
    import matplotlib.pyplot as plt
  File "/Users/xxxxxxxxxxx/anaconda3/envs/ML35/lib/python3.5/site-packages/matplotlib/__init__.py", line 125, in <module>
    from inspect import Parameter
ImportError: cannot import name 'Parameter'

有帮助吗？ 谢谢！