Is it possible to use comparison operators on an error?

Question

I am doing something similar to this to output if a variable contains a substing.

print("Variable contains foo" * variable.index("foo") !=None)

But when I run the program, I just get this error.

ValueError: substring not found

Of course, I am expecting variable to not contain "foo" sometimes, so is there any way to do something like this without using try and except?

Answer 1

As @IainShelvington already said you can use 'foo' in variable which will never raise an Exception, or not in for opposite condition:

Try it online!

variable = 'a foo'
print("Variable contains foo" * ('foo' in variable))
variable2 = 'a bar'
print("Variable2 has no foo" * ('foo' not in variable2))

Output:

Variable contains foo
Variable2 has no foo