How to change if from one liner to multiple lines-CodePudding

I'm quite new to python and I want to change this piece of code from one line if statement into multiple lines.

The code:

self.a = -self.ax if self.a <= 0 or self.a >= dd.maxX else self.ax
self.b = -self.bx if self.b <= 0 or self.b >= dd.maxX else self.bx

What I did so far was this:

if self.a <= 0 or self.a >= dd.maxX:
   self.a = -self.ax

if self.b <= 0 or self.b >= dd.maxX:
   self.a = -self.bx

but when I add else statment the code doesn't work anymore. How to fix this problem?

CodePudding user response：

The original code assigns a value if the test is true and a different value if the test is not true:

Perhaps this makes it more visible:

self.a = (
   -self.ax if self.a <= 0 or self.a >= dd.maxX
   else self.ax
)

You need to account for both cases as well:

if self.a <= 0 or self.a >= dd.maxX:
   self.a = -self.ax
else:
   self.a = self.ax