python - 为什么变量赋值在列表中这样工作？

Question

a = [0]
b = a
a[0] = 1

print b

这将打印 1，为什么这适用于列表而不适用于 int 或 float 或类似的东西？

Answer 1

a = [0]    # create an int, create a container referencing the int, let "a" reference the container

b = a      # let "b" reference the same container as "a"
a[0] = 1   # create another int, let container "a" reference the new int

print b    # "b" and "a" refer to the same container with the new contents

查看此 Python Tutor visualization为了更清楚地了解正在发生的事情。