python中"变量或0"是什么意思？

Question

python中以下语句的含义是什么:

x = variable_1 or 0

variable_1是一个对象.x上面有什么价值？那是什么类型的x？

Answer 1

x将是0如果variable_1评估为假,否则它将是variable_1

>>> 'abc' or 0
'abc'
>>> '' or 0
0
>>> ['a', 'b', 'c'] or 0
['a', 'b', 'c']
>>> [] or 0
0

Answer 2

如果variable_1 求值为False,则x设置为0,否则为variable_1

把它想象成

if variable_1:
  x = variable_1
else:
  x = 0