Python: lambda vs if/else

Question

I tried to replace lambda self.status: partial if max_refundable == amount else self.status = refunded with if/else to make it in one line. However, it doesn’t work as expected. Anyone knows where the problem is?

if max_refundable == amount:
    self.status = partial
else:
    self.status = refunded

Asked By: user9252255

||

Source

Answer 1

The syntax is as follows:

a = 1
b = 3
a = a+b if a == 2 else b

In your case, it would look like this:

self.status = partial if max_refundable == amount else refunded

Answered By: Reblochon Masque

Answer 2

Because that is invalid syntax

lambda self.status: partial if max_refundable == amount else self.status = refunded

is equivelent to

def _lambda_func_(self.status):
    return partial if max_refundable == amount else self.status = refunded

which isn’t what you want (self.status is not a valid argument name). You don’t need a function, just do

self.status = partial if max_refundable == amount else refunded

Answered By: FHTMitchell

Python: lambda vs if/else

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