Question: I tried to understand it by myself using the [doc](https://docs.scipy.org/doc/scipy-0.19.1/reference/index.html) , but I don't get why, from the module `scipy`, I can import `linspace` which is a function of the module `numpy`. They both work well. 
Also, I can't find it in the `scipy` doc.

Answer: 
1...OLD WAY = commandName 

```
<form:form action="index" commandName="todo">

```

2...NEW WAY = modelAttribute

```
  <form:form action="index" modelAttribute="todo">

```

commandName was the old way of doing it and in new applications you should be using modelAttribute
This can be resolved by changing 'commandName' with 'modelAttribute' in the form.
With Spring 5 jars , commandName parameter is not working.

Please visit below link for more details on changes present in Spring framework 5:

<https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x>