Syntax error with ternary operator

Question

I\'m new to Python and I\'m trying to use ternary opertor which has this format (I think so)

value_true if  else value_false

He

Answer 1

Ternary operation in python using for expression, not statements. Expression is something that has value.

Example:

result = foo() if condition else (2 + 4)
#        ^^^^^                   ^^^^^^^
#      expression               expression

For statements (code blocks such as continue, for, etc) use if:

if condition:
     ...do something...
else:
     ...do something else...

What you want to do:

expanded = set()

while not someExpression:
    if currentState not in expanded: # you use set, so this condition is not really need
         expanded.add(currentState)
         # some code here