python - 如何在python中使用比较和 ' if not'？

Question

在我的一个程序中，我怀疑我是否正确使用了比较。我想在做某事之前确保( u0 <= u < u0+step )。

if not (u0 <= u) and (u < u0+step):
    u0 = u0+ step # change the condition until it is satisfied
else:
    do something. # condition is satisfied

Answer 1

你可以这样做:

if not (u0 <= u <= u0+step):
    u0 = u0+ step # change the condition until it is satisfied
else:
    do sth. # condition is satisfied

使用循环:

while not (u0 <= u <= u0+step):
   u0 = u0+ step # change the condition until it is satisfied
do sth. # condition is satisfied