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# renpy.watch

Function: | renpy.watch | (expression, style='default', **properties):

This watches the given python expression, by displaying it in the upper-left corner of the screen (although position properties can change that). The expression should always be defined, never throwing an exception.

A watch will not persist through a save or restart.

## Example

    init:
        $ renpy.watch("renpy.get_filename_line()")

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