set_text
Description:
Sets text into this.
As a side effect, if text is null, then the entry will be completely empty, whereas if
text is the empty string (""), then this will display the prefix and/or suffix and/or format string
if they have been set. Except this case, calling this method is similar to calling
set_text
Parameters:
| this |
a Entry widget |
| text |
the text to set into this, or null |