如何为后续的plot命令设置颜色？

import matplotlib.pyplot as plt

# 示例数据
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]

# 绘制第一条线，颜色为红色
plt.plot(x, y1, color='red')

# 绘制第二条线，颜色为蓝色
plt.plot(x, y2, color='blue')

# 显示图形
plt.show()

import matplotlib.pyplot as plt

# 设置颜色循环
plt.rc('axes', prop_cycle=(plt.cycler('color', ['red', 'green', 'blue', 'yellow'])))

# 示例数据
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]
y3 = [25, 16, 9, 4, 1]

# 绘制多条线
plt.plot(x, y1)
plt.plot(x, y2)
plt.plot(x, y3)

# 显示图形
plt.show()

import matplotlib.pyplot as plt

# 设置全局颜色循环
plt.rcParams['axes.prop_cycle'] = plt.cycler('color', ['red', 'green', 'blue', 'yellow'])

# 示例数据
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]
y3 = [25, 16, 9, 4, 1]

# 绘制多条线
plt.plot(x, y1)
plt.plot(x, y2)
plt.plot(x, y3)

# 显示图形
plt.show()

import matplotlib.pyplot as plt
from matplotlib.lines import Line2D

# 示例数据
x = [1, 2, 3, 4, 5]
y1 = [1, 4, 9, 16, 25]
y2 = [1, 2, 3, 4, 5]

# 创建图形和轴对象
fig, ax = plt.subplots()

# 创建 Line2D 对象并设置颜色
line1 = Line2D(x, y1, color='red')
line2 = Line2D(x, y2, color='blue')

# 将 Line2D 对象添加到轴对象中
ax.add_line(line1)
ax.add_line(line2)

# 设置轴的范围
ax.set_xlim(0, 6)
ax.set_ylim(0, 30)

# 显示图形
plt.show()