变量赋值给变量

a = 'ABC'
b = a
a = 'XYZ'
print(b)

结果为'ABC'

解释看url：https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001431658624177ea4f8fcb06bc4d0e8aab2fd7aa65dd95000