Python 使用Axes3d的3D打印不执行

当我尝试在pycharm中绘制3D对象时，会出现以下错误：

TypeError: 'module' object is not callable

代码结构：

# visualizing data with pyplot
#usings
import numpy as np
import matplotlib.pyplot as plt
import urllib
from mpl_toolkits.mplot3d import axes3d
#main code
fig=plt.figure()
ax=axes3d(fig)
t=np.linspace(0,5*np.pi,501)
ax.plot(np.cos(t),np.sin(t),t)
plt.show()

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请参阅工作代码示例

我把这行代码ax=axes3d（图）换成了ax=axes3d（图），运行正常

import numpy as np
import matplotlib.pyplot as plt

from mpl_toolkits.mplot3d import axes3d
#main code
fig=plt.figure()
ax = fig.gca(projection='3d')
t=np.linspace(0,5*np.pi,501)
ax.plot(np.cos(t),np.sin(t),t)
plt.show()