How can I avoid generating the same code repeatedly when using definitions_?

[ziyang]

I have two kinds of block that all need to import the math python module
// in A Block
 (pythonGenerator as any).definitions_['import_math'] = 'import math';
 // in B Block
 (pythonGenerator as any).definitions_['import_math'] = 'import math

if these two blocks all exist in my workspace, the output code will be 
`

import math

import math

... ...(some code)
`

I just want to import math module once, how to get rid of another?

[Neil Fraser]

The definitions_ map is specifically designed to prevent duplications.  And the code you posted looks like it is correct.  Double-check that you don't have any typos.

Here's a demo showing that in the python code there's only a single 'import math': https://blockly-demo.appspot.com/static/demos/code/index.html#dgc8mj

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Neil Fraser, Switzerland
https://neil.fraser.name