Matplotlib错误：'str‘对象没有属性'get_figure’

import matplotlib.pyplot as plt

# 创建一个图形对象
fig, ax = plt.subplots()

# 确保 fig 是一个图形对象
if hasattr(fig, 'get_figure'):
    print("fig is a valid figure object")
else:
    print("fig is not a valid figure object")

import matplotlib.pyplot as plt

# 错误的赋值
fig = "not a figure object"

# 正确的赋值
fig, ax = plt.subplots()

# 确保 fig 是一个图形对象
if hasattr(fig, 'get_figure'):
    print("fig is a valid figure object")
else:
    print("fig is not a valid figure object")

import matplotlib.pyplot as plt

def create_figure():
    return plt.subplots()

fig, ax = create_figure()

# 确保 fig 是一个图形对象
if hasattr(fig, 'get_figure'):
    print("fig is a valid figure object")
else:
    print("fig is not a valid figure object")

import matplotlib.pyplot as plt

# 创建一个图形对象
fig, ax = plt.subplots()

# 绘制一个简单的图形
ax.plot([1, 2, 3], [4, 5, 6])

# 显示图形
plt.show()

# 确保 fig 是一个图形对象
if hasattr(fig, 'get_figure'):
    print("fig is a valid figure object")
else:
    print("fig is not a valid figure object")