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Improved convert() function documentation

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Simon Willison 2023-07-25 07:47:29 -07:00
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docs/cli.rst
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@ -1734,10 +1734,12 @@ This supports nested imports as well, for example to use `ElementTree <https://d
.. _cli_convert_complex:
Using a convert() function to execute initialization
----------------------------------------------------
Defining a convert() function
-----------------------------
In some cases you may need to execute one-off initialization code at the start of the run. You can do that by providing code that runs before defining your ``convert(value)`` function.
Instead of providing a single line of code to be executed against each value, you can define a function called ``convert(value)``.
This mechanism can be used to execute one-off initialization code that runs once at the start of the conversion run.
The following example adds a new ``score`` column, then updates it to list a random number - after first seeding the random number generator to ensure that multiple runs produce the same results: