python-2.7 - Python - 分配 None 或值

Question

是否有一种简短的方法可以根据值在变量中分配 None 或值？

x= value if value!= 999 else None

Answer 1

result = (on_false, on_true)[condition]

>>> value = 10
>>> x = (None,value)[value != 999]
>>> print x
10

>>> value = 999
>>> x = (None,value)[value != 999]
>>> print x
None