22、Python 列表与函数应用全解析

Python 列表与函数应用全解析

1. 列表绘图示例

在 Python 中，我们可以使用列表来绘制正弦和余弦曲线。以下是实现该功能的代码：

import math
import matplotlib.pyplot as plt

# The x-values will be the same for both curves.
trigX = []
sinY = []
cosY = []

# Compute the y-values for the sine and cosine curves.
angle = -180
while angle <= 180:
    x = math.pi / 180 * angle
    trigX.append(x)

    y = math.sin(x)
    sinY.append(y)

    y = math.cos(x)
    cosY.append(y)
    angle = angle + 1

# Plot the two curves.
plt.plot(trigX, sinY)
plt.plot(trigX, cosY)

# Add descriptive information.
plt.title("Trigonometric Functions")

# Improve the appearance of the graph.
plt.legend(["sin(x)", "cos(x)"])
plt.grid("on")
plt.axis("equal")
plt.axhline(color="k")
plt.axvline(color="k")

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