Common Python Code Configuration

Functions or variables that are shared by multiple blocks are referred to as common functions or variables, and you can define and modify them in a centralized way by configuring common Python code.

Common Python code can be configured in multiple ways. This page describes the following three ways:

• Way 1: Add common code in hat blocks
• Way 2: Modify the transcoding template
• Way 3: Define common code in middleware

Add common code in a hat block

Generally, blocks that are to be translated into Python code are put under the hat block named when () starts up, and therefore, you can add the common code in the lib of the hat block.

The transcoding is as follows:

Place the add function on top of ### code #$$, as shown in the following:

1    # generated by mBlock5 for <product>
2    # codes make you happy
3    ### import #$$
4    ### lib #$$
5    ###
6    # initialize variables
7    ###{
8         (this.$ALL_VARIABLES.length === 0) ? undefined : this.$ALL_VARIABLES.map(n => n + ‘ = 0’).join(‘\\n’)
9    }#$$
10   #$$
11   def add(a, b):
12         print(‘%d+%d=%d’%(a,b,a+b))
13   ### code #$$
14   ###
15   while True:
16        # every tick
17        ### loop #$$
18   #$$

 

The following describes how to configure middleware for a device extension:

1. Click + to add middleware.

      2. Set the name of the middleware.

3. Check Custom.

4. Edit the code.

The code shown in the preceding is the strings into which the blocks are translated. You can insert the common code required into the code and then return the code, as shown in the following:

1    /**
2    * Custom Upload Middleware
3    *
4    * @param {AppContext} app
5    * @param {DeviceContext} device
6    * @param {String} code
7    * @param {Object} params
8    * @param {Function} logH
9    * @param {Function} progessH
10  */
11   (app, device, code, params, logH, progessH) => {
12         // process code here
13         code += ‘def add(a,b):
14         print(‘%d+%d=%d’%(a,b,a+b))\n’;
15         return code;
16   }

Advantage: You can write any code that you don’t want others to see in the middleware.