Redshoe's questions

给定一个字符串Please help me do my homework !!!

我想Please help me do my homework用 bash 来解析它。

我尝试的是

str="Please help me do my homework !!!"
printf "${str: -4:100}"

我明白了 !!!。我猜 ${str: -4} 意味着它从倒数第 4 个字符开始。

我正在尝试更改单个图中多个图中每个小提琴图的颜色。我可以更改主体的颜色，但无法更改cbars、cmins、cmaxes的颜色。我该怎么做？

import matplotlib.pyplot as plt

mock_data= [
           [0,1,2,3,4,5,6,7,8,9],
           [1,2,3,4,5,6,7,8,9,10],
           [2,3,4,5,6,7,8,9,10,11],
           [3,4,5,6,7,8,9,10,11,12],
           [4,5,6,7,8,9,10,11,12,13],
           [5,6,7,8,9,10,11,12,13,14],
           [6,7,8,9,10,11,12,13,14,15],
           [7,8,9,10,11,12,13,14,15,16],
           [8,9,10,11,12,13,14,15,16,17],
           [9,10,11,12,13,14,15,16,17,18],
           ]
pos      = [0,1,2,3,4,5,6,7,8,9]
colors   = ["C0","C1","C2","C3","C4","C5","C6","C7","C8","C9"]
fig, ax  = plt.subplots(1,1)

violin   = ax.violinplot(mock_data,positions=pos)

for things in ["bodies","cbars","cmins","cmaxes"]:
   for vp, co in zip(violin[things],colors):
      vp.set_facecolor(co)
      vp.set_edgecolor(co)


plt.show()

使用上述代码，我收到以下错误

Traceback (most recent call last):
  File "/downloads/violin.py", line 25, in <module>
    for vp, co in zip(violin[things],colors):
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'LineCollection' object is not iterable

似乎只有violin["bodies"]是可迭代的，但violin["cbars"]、violin["cmins"]、violin["cmaxes"]不是。鉴于此，如何有效地更改均值、最小值和最大值的线条颜色？