优化以下代码，加入图例：import matplotlib.pyplot as plt import numpy as np lines = [] line_styles = ['-', ':', '--', '-.'] line_colors = ['red', 'black', 'green', 'blue'] x = np.linspace(0, 10, 1000) # YOUR CODE HERE fig, ax = plt.subplots() for i in range(0, 4): y = np.sin(x + i * np.pi/2) lines.append(plt.plot(x, y, linestyle=line_styles[i], color=line_colors[i])) plt.show()

以下以下是以下是优以下是优化以下是优化后以下是优化后的以下是优化后的代码以下是优化后的代码，以下是优化后的代码，加以下是优化后的代码，加入以下是优化后的代码，加入了以下是优化后的代码，加入了图以下是优化后的代码，加入了图例以下是优化后的代码，加入了图例：

以下是优化后的代码，加入了图例：

import以下是优化后的代码，加入了图例：

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import matplotlib.pyplot以下是优化后的代码，加入了图例：

import matplotlib.pyplot as以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles =以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors =以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', '以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', '以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green',以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', '以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig,以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax =以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y =以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line,以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, =以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x,以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y,以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i],以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i],以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=lines以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=lines)

以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=lines)

plt以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=lines)

plt.show以下是优化后的代码，加入了图例：

import matplotlib.pyplot as plt
import numpy as np

line_styles = ['-', ':', '--', '-.']
line_colors = ['red', 'black', 'green', 'blue']

fig, ax = plt.subplots()

for i in range(len(line_styles)):
y = np.sin(x+i*np.pi/2)
line, = ax.plot(x, y, linestyle=line_styles[i], color=line_colors[i], label='Line '+str(i+1))
lines.append(line)

ax.legend(handles=lines)

plt.show()