python的曲线平滑工具，及python画一条线中包含不同粗细不同颜色的画线方法

from scipy.signal import savgol_filter

import matplotlib.pyplot as plt

cc = savgol_filter(c, 99, 1)

plt.plot(c)
plt.plot(cc)
plt.show()

from matplotlib.collections import LineCollection
import numpy as np
import math
import matplotlib.pyplot as plt

pi = 3.1415

x = np.linspace(0, 4*pi, 100)
y = [math.cos(xx) for xx in x]
lwidths = abs(x)
color = []
for i in range(len(y)):
    if i < 5:
        color.append('#FF0000')
    else:
        color.append('#000000')

print(x)
print(y)
print('--------------------------------------')
points = np.array([x, y]).T.reshape(-1, 1, 2)
print(points)
print('--------------------------------------')
segments = np.concatenate([points[:-1], points[1:]], axis=1)
print(segments)
lc = LineCollection(segments, linewidths=lwidths, color=color)

ax = plt.axes()
ax.set_xlim(min(x), max(x))
ax.set_ylim(min(y), max(y))
ax.add_collection(lc)
plt.show()

'''
fig, a = plt.subplots()
a.add_collection(lc)
a.set_xlim(0, 4*pi)
a.set_ylim(-1.1, 1.1)
fig.show()
'''