我的理解是Python字符串是不可变的.
我尝试了以下代码:
a = "Dog"
b = "eats"
c = "treats"
print a, b, c
# Dog eats treats
print a + " " + b + " " + c
# Dog eats treats
print a
# Dog
a = a + " " + b + " " + c
print a
# Dog eats treats
# !!!
Python不应该阻止这项任务吗？我可能错过了一些东西.
任何的想法？