# 匯入matplotlib.pyplot, numpy 包

import numpy as np

import matplotlib.pyplot as plt

# 新增主題樣式

plt.style.use("mystyle")

# 設定圖的大小，新增子圖

fig = plt.figure(figsize=(5,5))

ax = fig.add_subplot(111)

#繪製sin, cos

x = np.arange(-np.pi, np.pi, np.pi / 100)

y1 = np.sin(x)

y2 = np.cos(x)

sin, = ax.plot(x, y1, color="red", label="sin")

cos, = ax.plot(x, y2, color="blue", label="cos")

ax.set_ylim([-1.2, 1.2])

# 第二種方式 拆分顯示

sin_legend = ax.legend(handles=[sin], loc="upper right")

ax.add_artist(sin_legend)

ax.legend(handles=[cos], loc="lower right")

plt.show()

import numpy as np

import matplotlib.pyplot as plt

# 新增主題樣式

plt.style.use("mystyle")

# 設定圖的大小，新增子圖

fig = plt.figure(figsize=(5,5))

ax = fig.add_subplot(111)

for color in ["red", "green"]:

n = 750

x, y = np.random.rand(2, n)

scale = 200.0 * np.random.rand(n)

ax.scatter(x, y, c=color, s=scale,

label=color, alpha=0.3,

edgecolors="none")

ax.legend()

ax.grid(True)

plt.show()