python的腳本如下

import maya.cmds as mc
win=mc.window()
mc.columnLayout( adjustableColumn = True )
btn1=mc.button(l="按鈕開",c='')
btn2=mc.button(l="按鈕2",c='mc.button(btn1,e = 1,l = "按鈕關")')
mc.showWindow(win)

mel的腳本如下

window;
columnLayout -adj 1;
button -l "按鈕開" -c "" btn1;
button -l "按鈕2" -c "button -e -l \"按鈕關\" btn1";
showWindow;

其實還可以寫成函數來調用
python函數如下

import maya.cmds as mc
win=mc.window()
mc.columnLayout( adjustableColumn = True )
btn1=mc.button(l="按鈕開",c='')
btn2=mc.button(l="按鈕2",c = 'change()')
mc.showWindow(win)
def change():
btn = mc.button(btn1,q = 1,l = 1)
if btn == '按鈕開':
mc.button(btn1,e = 1,l = '按鈕關')
if btn == '按鈕關':
mc.button(btn1,e = 1,l = '按鈕開')

mel函數如下

window;
columnLayout -adj 1;
button -l "按鈕開" -c "" btn1;
button -l "按鈕2" -c "btn1";
showWindow;

proc btn1(){
string $btn1 = `button -q -l btn1`;
if($btn1 == "按鈕開"){
button -e -l "按鈕關" btn1;
}
if($btn1 == "按鈕關"){
button -e -l "按鈕開" btn1;
}
}