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gtk.Entry.set_invisible_char
...
a Unicode character
Sets the character to use in place of the actual text when gtk.En
+try.set_visibility() has been called to set text visibility to FALSE.
+ i.e. this is the character used in "password mode" to show the user
+how many characters have been typed. The default invisible char is an
+ asterisk ('*'). If you set the invisible char to 0, then the user wi
+ll get no feedback at all; there will be no text on the screen as the
+y type.