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It looks like the arguments were inadvertently swapped during the conversion to Argument Clinic. The Library Reference doc says:
window.addch(y, x, ch[, attr])
but the Argument Clinic docstring for 3.4.0 says:
Help on built-in function addch:
addch(...) method of _curses.curses window instance
 addch([x, y,] ch, [attr])
 Paint character ch at (y, x) with attributes attr.
 x
 X-coordinate.
 y
 Y-coordinate.
 ch
 Character to add.
 attr
 Attributes for the character.
 Paint character ch at (y, x) with attributes attr,
 overwriting any character previously painted at that location.
 By default, the character position and attributes are the
 current settings for the window object.
Perhaps we should check for others?