How do you use elif when defining a variable?-CodePudding

I'm trying to execute code like the following

y = 6
x = 7 if y/6 == 1 elif y/6 == 2 x = 5 else x = 4

Simply, it does not work. I'm not sure how to make elif statements fit into defining variables on one line.

I'm able to use else statements like the following

y = 6
x = 7 if y/6 == 1 else x = 4

I want to be able to set x to 7 if y/6 ==1, x to 5 if y/6 == 2 and x to 4 if neither of those are the case

CodePudding user response：

Use chained ternary expressions:

>>> y = 6
>>> x = 7 if y/6 == 1 else 5 if y/6 == 2 else 4
>>> x
7

The way to read this is:

x = ((7) if y/6 == 1 else ((5) if y/6 == 2 else (4)))

i.e. each expr1 if pred else expr2 is itself an expression.

CodePudding user response：

You only need x = ... once at the beginning. The rest of the expression is evaluated as a value that will be assigned to x. You don't need to mention x again.

x = 7 if y/6 == 1 else 5 if y/6 == 2 else 4

In general, the syntax is

var = value1 if condition1 else value2 if condition2 else value3