geometry statement (from John Shipman's tkinter manual):
A geometry string is a standard way of describing the size and location of a top-level window on a
desktop.
A geometry string has this general form:
'wxh±x±y'
where:
- The w and h parts give the window width and height in pixels. They are separated by the character
'x'.
- If the next part has the form +x, it specifies that the left side of the window should be x pixels from
the left side of the desktop. If it has the form -x, the right side of the window is x pixels from the
right side of the desktop.
- If the next part has the form +y, it specifies that the top of the window should be y pixels below the
top of the desktop. If it has the form -y, the bottom of the window will be y pixels above the bottom
edge of the desktop.
For example, a window created with geometry='120x50-0+20' would be 120 pixels wide by 50
pixels high, and its top right corner will be along the right edge of the desktop and 20 pixels below the
top edge.