报错内容：
AttributeError: module 'numpy' has no attribute 'int'.
`np.int` was a deprecated alias for the builtin `int`. To avoid this error in existing code, use `int` by itself. Doing this will not modify any behavior and is safe. When replacing `np.int`, you may wish to use e.g. `np.int64` or `np.int32` to specify the precision. If you wish to review your current use, check the release note link for additional information.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations
最近学习鸢尾花分类的案例，其中一步报错，如上所示
原因：
新的版本里面没有np.int了
解决办法：
1、降低版本：
pip uninstall numpy
pip install numpy==1.19.0
2、修改源码：
y=(iris['target']==2).astype(np.int) #修改前
y=(iris['target']==2).astype(int) #修改后
为了防止低版本的numpy影响其他库，我选择了第二种方法，结果如下可以正常运行
