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PLUGINS.md: Be explicit about why plugin_prefs(...) -> Optional[tk.Frame]

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Athanasius 2020-12-21 14:44:39 +00:00
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@ -228,10 +228,15 @@ a single set and two get methods, the new methods provide better type safety.
with core EDMC or other plugins.**
Use `number_from_string()` from EDMC's `l10n.Locale` object to parse input
numbers in a locale-independent way.
numbers in a locale-independent way. NB: the old CamelCase versions of
`number_from_string` and `string_from_number` do still exist, but arexi
deprecated. They will continue to work, but will throw warnings.
Note that the old CamelCase versions of `number_from_string` and `string_from_number` do still exist,
but are deprecated. They will continue to work, but will throw warnings.
Note that in the following example the function signature defines that it
returns `Optional[tk.Frame]` only because we need to allow for `None` if
something goes wrong with the creation of the frame (the calling code checks
this). You absolutely need to return the `nb.Frame()` instance that you get
as in the code below.
```python
import tkinter as tk